# Zelipho Tools

> Zelipho provides a free, privacy-first suite of web-based tools, image processing utilities, fantasy name generators, marketing/educational calculators, and browser-based hardware test tools (mouse, click speed, polling rate). All tools process data 100% client-side in the user's browser with zero server uploads or data logging.

Website: https://zelipho.com

## Name Generators

- [Elf Name Generator](https://zelipho.com/name-generators/elf-names): Generate mystical Tolkien-inspired Elvish names with lore and etymologies.
- [Dwarf Name Generator](https://zelipho.com/name-generators/dwarf-names): Sturdy Norse-inspired Dwarven names for RPG characters.
- [Orc Name Generator](https://zelipho.com/name-generators/orc-names): Fierce Black Speech Orc names and clan titles.
- [Planet Name Generator](https://zelipho.com/name-generators/planet-names): Sci-fi and fantasy planet and world names.
- [Kingdom Name Generator](https://zelipho.com/name-generators/kingdom-names): Medieval and fantasy realm names.
- [Alien Name Generator](https://zelipho.com/name-generators/alien-names): Exotic extraterrestrial species and alien character names.
- [Dragon Name Generator](https://zelipho.com/name-generators/dragon-names): Powerful western dragon names.
- [Chinese Dragon Name Generator](https://zelipho.com/name-generators/dragon-names-chinese): Traditional Eastern Long dragon names.
- [Japanese Dragon Name Generator](https://zelipho.com/name-generators/dragon-names-japanese): Mythological Japanese Ryu dragon names.
- [Goblin Name Generator](https://zelipho.com/name-generators/goblin-names): Crafty and guttural goblin names.
- [Spell Name Generator](https://zelipho.com/name-generators/spell-names): Epic incantations and magical spell names.
- [Potion Name Generator](https://zelipho.com/name-generators/potion-names): Mystical elixirs and alchemical brew names.
- [Tavern Name Generator](https://zelipho.com/name-generators/tavern-names): Cozy inns and rowdy fantasy pub names.
- [Guild Name Generator](https://zelipho.com/name-generators/guild-names): MMO clans and RPG adventuring party names.
- [Vampire Name Generator](https://zelipho.com/name-generators/vampire-names): Gothic and aristocratic vampire names.
- [Witch Name Generator](https://zelipho.com/name-generators/witch-names): Spooky and fantasy coven witch names.
- [Werewolf Name Generator](https://zelipho.com/name-generators/werewolf-names): Fierce, rugged, and pack-inspired lycanthrope names.
- [Troll Name Generator](https://zelipho.com/name-generators/troll-names): Brutal, tribal, and mythic troll names.
- [Necromancer Name Generator](https://zelipho.com/name-generators/necromancer-names): Dark, ominous, and powerful death mage names.
- [Fantasy Ship Name Generator](https://zelipho.com/name-generators/ship-names): Epic names for galleons, warships, and pirate vessels.
- [Moon Name Generator](https://zelipho.com/name-generators/moon-names): Sci-fi and fantasy celestial moon names.
- [Paladin Name Generator](https://zelipho.com/name-generators/paladin-names): Honorable and heroic holy warrior names.
- [Ranger Name Generator](https://zelipho.com/name-generators/ranger-names): Nature-bound and stealthy ranger names.
- [Fairy Name Generator](https://zelipho.com/name-generators/fairy-names): Enchanting and magical pixie and fairy names.
- [Demon Name Generator](https://zelipho.com/name-generators/demon-names): Dark, abyssal, and sinister demon names.
- [Viking Name Generator](https://zelipho.com/name-generators/viking-names): Fierce, historic, and Nordic warrior names.
- [Pirate Name Generator](https://zelipho.com/name-generators/pirate-names): Swashbuckling and fearsome buccaneer names.
- [Barbarian Name Generator](https://zelipho.com/name-generators/barbarian-names): Tribal and savage berserker names.
- [Druid Name Generator](https://zelipho.com/name-generators/druid-names): Mystical, nature-bound, and Celtic druid names.
- [Bard Name Generator](https://zelipho.com/name-generators/bard-names): Melodic, poetic, and D&D fantasy bard names.
- [Warlock Name Generator](https://zelipho.com/name-generators/warlock-names): Eldritch, dark pact, and D&D 5e warlock names with lore.
- [Angel Name Generator](https://zelipho.com/name-generators/angel-names): Holy, celestial, archangel, and seraphim names with meanings and lore.
- [Island Name Generator](https://zelipho.com/name-generators/island-names): Tropical, pirate, volcanic, and fantasy island names with geographic lore.
- [Village Name Generator](https://zelipho.com/name-generators/village-names): Medieval, cozy, fortified, and fantasy village names with historical lore.
- [Castle Name Generator](https://zelipho.com/name-generators/castle-names): Majestic, gothic, dark, and fantasy castle names with architectural lore.
- [Dungeon Name Generator](https://zelipho.com/name-generators/dungeon-names): Dark, ancient, volcanic, and fantasy dungeon names with encounter lore.
- [Fantasy City Name Generator](https://zelipho.com/name-generators/fantasy-city-names): Grand, imperial, high-magic, and dark fantasy city names with district lore.
- [Tribe Name Generator](https://zelipho.com/name-generators/tribe-names): Nomadic, warrior, barbarian, and druidic tribe names with ancestral lore.
- [Assassin Name Generator](https://zelipho.com/name-generators/assassin-names): Stealth, lethal, poisoner, and fantasy assassin names with contract lore.
- [Bandit Name Generator](https://zelipho.com/name-generators/bandit-names): Outlaw, highwayman, marauder, and brigand names with hideout lore.
- [Cult Name Generator](https://zelipho.com/name-generators/cult-names): Eldritch, necromantic, and dark secret society cult names with forbidden ritual lore.
- [Tiefling Name Generator](https://zelipho.com/name-generators/tiefling-names): Infernal, virtue concept, and archdevil bloodline tiefling names with virtue lore.
- [Halfling Name Generator](https://zelipho.com/name-generators/halfling-names): Lightfoot, Stout, and Ghostwise shire halfling names with family surname lore.
- [Gnome Name Generator](https://zelipho.com/name-generators/gnome-names): Rock gnome tinkers, forest illusionists, and svirfneblin deep gnome names with guild lore.
- [Half-Orc Name Generator](https://zelipho.com/name-generators/half-orc-names): Tribal warrior, berserker, and mercenary captain half-orc names with battle lore.
- [Aasimar Name Generator](https://zelipho.com/name-generators/aasimar-names): Protector, Scourge, and Fallen celestial aasimar names with angelic guide lore.
- [Tabaxi Name Generator](https://zelipho.com/name-generators/tabaxi-names): Poetic, nature-inspired, beast claw, and riddle-seeker Tabaxi names with nicknames.
- [Drow Name Generator](https://zelipho.com/name-generators/drow-names): Female priestess, male weaponmaster, and noble house Drow names with Underdark lore.
- [Genasi Name Generator](https://zelipho.com/name-generators/genasi-names): Air, Fire, Earth, and Water elemental Genasi names with planar lore.
- [Weapon & Sword Name Generator](https://zelipho.com/name-generators/weapon-names): Legendary sword names, warhammers, daggers, and mythic bows with forging lore.
- [Magic Item Name Generator](https://zelipho.com/name-generators/magic-item-names): Wondrous items, enchanted rings, scrolls, staves, and planar relics with lore.
- [Quest Name Generator](https://zelipho.com/name-generators/quest-names): Epic campaign quest titles, monster bounties, guild contracts, and mysteries with lore.
- [Superhero Name Generator](https://zelipho.com/name-generators/superhero-names): Iconic superhero names, cosmic guardians, tech vigilantes, and mutant defenders with lore.
- [Villain Name Generator](https://zelipho.com/name-generators/villain-names): Sinister villain names, dark lords, evil masterminds, and corrupt nobles with lore.
- [Steampunk Name Generator](https://zelipho.com/name-generators/steampunk-names): Victorian steampunk names, clockwork inventors, airship captains, and scholars with lore.
- [Anime Character Name Generator](https://zelipho.com/name-generators/anime-names): Japanese anime character names, Kanji meanings, shonen heroes, and isekai archmages with lore.
- [Fantasy Last Name Generator](https://zelipho.com/name-generators/fantasy-last-names): Noble family surnames, elven house titles, dwarven clan names, and dark bloodlines with lore.
- [Cyberpunk Name Generator](https://zelipho.com/name-generators/cyberpunk-names): Cyberpunk handles, netrunner aliases, chrome street samurai, and corporate agents with lore.
- [Space Station Name Generator](https://zelipho.com/name-generators/space-station-names): Starbases, orbital habitats, deep space outposts, zero-g research labs, and mining platforms with lore.
- [Secret Society Name Generator](https://zelipho.com/name-generators/secret-society-names): Secret society names, occult lodges, illuminati cabals, esoteric brotherhoods, and cult lore.
- [Magic Academy Name Generator](https://zelipho.com/name-generators/magic-academy-names): Wizarding universities, sorcery colleges, dark arcana institutes, druidic groves, and alchemical hubs with lore.
- [Mercenary Company Name Generator](https://zelipho.com/name-generators/mercenary-company-names): Mercenary company names, sellsword legions, PMC squads, privateer freebands, and military contract lore.
- [Ancient Civilization Name Generator](https://zelipho.com/name-generators/ancient-civilization-names): Ancient civilization names, empire designations, lost mythic kingdoms, bronze age dynasties, and historical lore.
- [Post-Apocalyptic Name Generator](https://zelipho.com/name-generators/post-apocalyptic-names): Post-apocalyptic survivor names, raider warlords, bunker settlements, radiation cults, and wasteland lore.
- [Historical Kingdom Name Generator](https://zelipho.com/name-generators/historical-kingdom-names): Historical kingdom names, feudal duchies, imperial dynasties, steppe khanates, and maritime republics with lore.
- [Elven City Name Generator](https://zelipho.com/name-generators/elven-city-names): Elven city names, high-elven starlight metropolises, wood-elven canopy groves, drow citadels, and sea ports.
- [Firbolg Name Generator](https://zelipho.com/name-generators/firbolg-names): Firbolg names for D&D 5e: deed and habit names, elven-style outsider names, grove druids and giant-kin wardens with lore.
- [Deity Name Generator](https://zelipho.com/name-generators/deity-names): Original god and goddess names with titles and domains for fantasy pantheons and worldbuilding.
- [Norse God Name Generator](https://zelipho.com/name-generators/norse-god-names): Original Norse-style god names built from real Old Norse elements, with epithets and meanings.
- [Monster Name Generator](https://zelipho.com/name-generators/monster-names): Homebrew monster names with creature types, lore hooks and threat tiers for D&D and other TTRPGs.
- [Robot Name Generator](https://zelipho.com/name-generators/robot-names): Robot and AI names: retro robots, friendly companions, combat units and sentient ship minds.

## Image Utilities & Converters

- [Gemini Watermark Remover](https://zelipho.com/image/gemini-watermark-remover): Remove Google Gemini AI watermarks from generated images online.
- [Image DPI Checker](https://zelipho.com/image/image-dpi-checker): Inspect image DPI, PPI, pixel dimensions, and print quality standards.
- [Bulk Image Resizer](https://zelipho.com/image/bulk-resizer): Batch resize and convert multiple images simultaneously.
- [Image Cropper](https://zelipho.com/image/image-cropper): Crop, zoom, and adjust photo dimensions browser-side.
- [Image Flipper](https://zelipho.com/image/image-flipper): Flip pictures horizontally or vertically.
- [Image Rotator](https://zelipho.com/image/image-rotator): Rotate photos by any custom angle.
- [GIF Frame Extractor](https://zelipho.com/image/gif-frame-extractor): Extract individual PNG/JPG frames from animated GIFs.
- [Color Palette Extractor](https://zelipho.com/image/color-palette-extractor): Extract dominant colors and HEX codes from any uploaded photo.
- [Image EXIF Remover](https://zelipho.com/image/remove-exif-data): Strip camera metadata, GPS location, and privacy tags from images.
- [Photo Metadata Viewer](https://zelipho.com/image/photo-metadata-viewer): Inspect camera settings, EXIF tags, and geolocation coordinates.
- [Blur Image](https://zelipho.com/image/blur-image): Apply selective or full blur effects to pictures.
- [Image Rounded Corners](https://zelipho.com/image/rounded-corners): Add custom rounded corner radii to images.
- [Image to Base64](https://zelipho.com/image/image-to-base64): Convert image files into Base64 data URLs for web development.
- [Image Extractor](https://zelipho.com/image/image-extractor): Download and extract all images from any web page URL.
- [JPG to PNG Converter](https://zelipho.com/image/jpg-to-png): Convert JPG images to transparent PNG format.
- [PNG to JPG Converter](https://zelipho.com/image/png-to-jpg): Convert PNG images to compressed JPG format.
- [HEIC to JPG Converter](https://zelipho.com/image/heic-to-jpg): Convert Apple HEIC photos to universal JPG format.
- [HEIC to PNG Converter](https://zelipho.com/image/heic-to-png): Convert HEIC images to PNG format.
- [WebP to JPG Converter](https://zelipho.com/image/webp-to-jpg): Convert Google WebP files to JPG format.
- [WebP to PNG Converter](https://zelipho.com/image/webp-to-png): Convert WebP files to PNG format.
- [SVG to PNG Converter](https://zelipho.com/image/svg-to-png): Render vector SVG files to raster PNG images.
- [SVG to JPG Converter](https://zelipho.com/image/svg-to-jpg): Render vector SVG files to JPG photos.
- [AVIF to PNG Converter](https://zelipho.com/image/avif-to-png): Convert modern AVIF images to PNG format.
- [AVIF to JPG Converter](https://zelipho.com/image/avif-to-jpg): Convert AVIF files to JPG format.
- [BMP to PNG Converter](https://zelipho.com/image/bmp-to-png): Convert legacy BMP bitmap files to PNG.
- [ICO to PNG Converter](https://zelipho.com/image/ico-to-png): Convert favicon ICO files to PNG image format.
- [ICO to JPG Converter](https://zelipho.com/image/ico-to-jpg): Convert favicon ICO files to JPG image format.
- [BMP to JPG Converter](https://zelipho.com/image/bmp-to-jpg): Convert legacy BMP bitmap files to JPG.
- [DDS to PNG Converter](https://zelipho.com/image/dds-to-png): Convert DirectDraw Surface (DDS) game textures to PNG.
- [DDS to JPG Converter](https://zelipho.com/image/dds-to-jpg): Convert DirectDraw Surface (DDS) game textures to JPG.
- [TGA to PNG Converter](https://zelipho.com/image/tga-to-png): Convert Targa (TGA) image files to PNG.
- [TGA to JPG Converter](https://zelipho.com/image/tga-to-jpg): Convert Targa (TGA) image files to JPG.
- [JPG to WebP Converter](https://zelipho.com/image/jpg-to-webp): Convert JPG images to modern WebP format.
- [PNG to WebP Converter](https://zelipho.com/image/png-to-webp): Convert PNG images to modern WebP format.
- [HEIC to AVIF Converter](https://zelipho.com/image/heic-to-avif): Convert Apple HEIC photos to next-gen AVIF format.

## Calculators & Business Tools

- [AP Chem Calculator](https://zelipho.com/calculators/edu/ap-chem-calculator): Predict AP Chemistry composite exam scores and grade boundaries.
- [Grade Calculator](https://zelipho.com/calculators/edu/grade-calculator): Calculate semester weighted grades, final exam targets, and GPA.
- [CGPA Calculator](https://zelipho.com/calculators/edu/cgpa-calculator): Combine semester GPAs weighted by credit hours into cumulative CGPA, and convert CGPA to percentage.
- [UAF CGPA Calculator](https://zelipho.com/calculators/edu/uaf-cgpa-calculator): Free CGPA calculator for University of Agriculture Faisalabad students.
- [UMT CGPA Calculator](https://zelipho.com/calculators/edu/umt-cgpa-calculator): Free CGPA calculator for University of Management and Technology Lahore students.
- [UCP CGPA Calculator](https://zelipho.com/calculators/edu/ucp-cgpa-calculator): Free CGPA calculator for University of Central Punjab students.
- [UOG CGPA Calculator](https://zelipho.com/calculators/edu/uog-cgpa-calculator): Free CGPA calculator for University of Gujrat students.
- [Probability Calculator](https://zelipho.com/calculators/edu/probability-calculator): Calculate single-event probability, combined two-event probability (AND/OR), and complement probability.
- [Binomial Probability Calculator](https://zelipho.com/calculators/edu/binomial-probability-calculator): Find P(X=k), P(X≤k) or P(X≥k) for a fixed number of trials with constant success probability, plus mean/variance/standard deviation.
- [Normal Distribution Calculator](https://zelipho.com/calculators/edu/normal-distribution-calculator): Convert a value or z-score to cumulative probability, or find the z-score for a target probability (inverse CDF).
- [Ad Spend Budget Calculator](https://zelipho.com/calculators/biz/ad-spend-budget-calculator): Plan and calculate advertising budgets, required clicks, leads, and sales goals.
- [Facebook Ads ROI Calculator](https://zelipho.com/calculators/biz/facebook-ads-roi-calculator): Calculate Meta and Facebook advertising return on investment, ROAS, and net campaign profit.
- [ROAS Calculator](https://zelipho.com/calculators/biz/roas-calculator): Calculate Return on Ad Spend multipliers and digital ad campaign revenue.
- [Break-Even ROAS Calculator](https://zelipho.com/calculators/biz/break-even-roas-calculator): Calculate minimum profit margin threshold required for ad profitability.
- [CPC Calculator](https://zelipho.com/calculators/biz/cpc-calculator): Calculate Cost Per Click, ad budget, or total click volume.
- [CPA Calculator](https://zelipho.com/calculators/biz/cpa-calculator): Calculate Cost Per Acquisition, conversion yields, and campaign budgets.
- [CAC Calculator](https://zelipho.com/calculators/biz/cac-calculator): Calculate Customer Acquisition Cost, LTV:CAC ratio, and CAC payback period.
- [LTV:CAC Ratio Calculator](https://zelipho.com/calculators/biz/ltv-cac-ratio-calculator): Check growth efficiency against the 3:1 LTV to CAC benchmark, with an LTV estimator.
- [CPL Calculator](https://zelipho.com/calculators/biz/cpl-calculator): Calculate Cost Per Lead and expected lead generation yields.
- [CPM Calculator](https://zelipho.com/calculators/biz/cpm-calculator): Calculate Cost Per Thousand Impressions and ad impression reach.
- [CTR Calculator](https://zelipho.com/calculators/biz/ctr-calculator): Calculate Click-Through Rate percentage and ad response metrics.
- [Ad Frequency Calculator](https://zelipho.com/calculators/biz/ad-frequency-calculator): Calculate ad frequency, unique audience reach, ad fatigue thresholds, and required impressions.
- [eCPM Calculator](https://zelipho.com/calculators/biz/ecpm-calculator): Calculate effective CPM, expected publisher ad revenue, and fill rate.
- [Google Ads Cost Calculator](https://zelipho.com/calculators/biz/google-ads-cost-calculator): Estimate Google Ads monthly cost, clicks, and Quality Score / Ad Rank CPC impact.
- [Ad Budget Split Calculator](https://zelipho.com/calculators/biz/ad-budget-split-calculator): Split an ad budget across Google, Meta, TikTok and other channels by percentage.
- [Etsy Fee Calculator](https://zelipho.com/calculators/biz/etsy-fee-calculator): Calculate Etsy seller fees, 6.5% transaction costs, payment processing, offsite ads, and net profit per sale.
- [Etsy Profit Margin Calculator](https://zelipho.com/calculators/biz/etsy-profit-margin-calculator): Calculate Etsy profit margins, markup, fee cuts, and target selling price.
- [Shopify Fee Calculator](https://zelipho.com/calculators/biz/shopify-fee-calculator): Calculate Shopify subscription plan costs, credit card rates, gateway fees, and plan upgrade thresholds.
- [Amazon Seller Fee Calculator](https://zelipho.com/calculators/biz/amazon-seller-fee-calculator): Calculate Amazon FBA & FBM referral fees, fulfillment rates, PPC spend, and net profit margins.
- [Print on Demand Profit Calculator](https://zelipho.com/calculators/biz/print-on-demand-profit-calculator): Calculate POD supplier base costs, customer shipping rates, ad spend, and net profit margins.
- [Dropshipping Profit Calculator](https://zelipho.com/calculators/biz/dropshipping-profit-calculator): Calculate dropshipping supplier COGS, customer shipping, ad CPA, and net store profit.
- [Gumroad Fee Calculator](https://zelipho.com/calculators/biz/gumroad-fee-calculator): Calculate Gumroad platform fees, payment processing, referral fees, and net creator payouts.
- [Redbubble Royalty Calculator](https://zelipho.com/calculators/biz/redbubble-royalty-calculator): Calculate Redbubble base prices, artist markup, sale discounts, and net payouts.
- [Merch by Amazon Royalty Calculator](https://zelipho.com/calculators/biz/merch-by-amazon-royalty-calculator): Calculate Amazon Merch on Demand royalties, price thresholds, PPC costs, and net payouts.
- [Gross Profit Margin Calculator](https://zelipho.com/calculators/biz/gross-profit-margin-calculator): Calculate gross profit margin, markup, itemized COGS, and target selling price.
- [Net Profit Margin Calculator](https://zelipho.com/calculators/biz/net-profit-margin-calculator): Calculate net profit margin from revenue, COGS, operating expenses, interest, and taxes.
- [Markup vs Margin Calculator](https://zelipho.com/calculators/biz/markup-vs-margin-calculator): Convert between markup % and margin %, or solve for selling price from cost.
- [Break-Even Point Calculator](https://zelipho.com/calculators/biz/break-even-point-calculator): Calculate break-even units, break-even revenue, and contribution margin.
- [Wholesale Price Calculator](https://zelipho.com/calculators/biz/wholesale-price-calculator): Calculate wholesale price from production cost and target margin, with a projected retail price.
- [Retail Price Calculator](https://zelipho.com/calculators/biz/retail-price-calculator): Calculate retail selling price from wholesale cost using a target margin % or keystone multiplier.
- [Freelance Hourly Rate Calculator](https://zelipho.com/calculators/biz/freelance-hourly-rate-calculator): Calculate your minimum freelance hourly rate from income goals, expenses, taxes, and billable hours.
- [Project Quote Calculator](https://zelipho.com/calculators/biz/project-quote-calculator): Turn estimated hours and your hourly rate into a flat client quote with a scope buffer and rush fee.
- [Agency Retainer Calculator](https://zelipho.com/calculators/biz/agency-retainer-calculator): Calculate a fair monthly retainer from committed hours, your hourly rate, and a retainer discount.
- [Invoice Late Fee Calculator](https://zelipho.com/calculators/biz/invoice-late-fee-calculator): Calculate late fees on an overdue invoice using a flat monthly rate or prorated annual interest.
- [Billable Hours Calculator](https://zelipho.com/calculators/biz/billable-hours-calculator): Calculate your billable utilization rate, non-billable hours, and true blended hourly earnings.
- [MRR Calculator](https://zelipho.com/calculators/biz/mrr-calculator): Calculate Monthly Recurring Revenue from subscribers and average price, plus an MRR bridge.
- [Churn Rate Calculator](https://zelipho.com/calculators/biz/churn-rate-calculator): Calculate monthly and annualized customer churn rate, plus optional MRR-based revenue churn.
- [Net Revenue Retention Calculator](https://zelipho.com/calculators/biz/net-revenue-retention-calculator): Calculate NRR and GRR from starting MRR, expansion, contraction, and churn.
- [Startup Runway Calculator](https://zelipho.com/calculators/biz/startup-runway-calculator): Calculate months of startup runway remaining from cash on hand and monthly burn rate.
- [Burn Rate Calculator](https://zelipho.com/calculators/biz/burn-rate-calculator): Calculate gross and net monthly burn rate from itemized expenses and revenue.
- [Instagram Engagement Rate Calculator](https://zelipho.com/calculators/biz/instagram-engagement-rate-calculator): Calculate Instagram engagement rate by followers or by reach.
- [TikTok Engagement Rate Calculator](https://zelipho.com/calculators/biz/tiktok-engagement-rate-calculator): Calculate TikTok engagement rate by video views or by followers.
- [YouTube Revenue Calculator](https://zelipho.com/calculators/biz/youtube-revenue-calculator): Estimate YouTube ad revenue from monthly views and niche RPM.
- [Influencer Rate Calculator](https://zelipho.com/calculators/biz/influencer-rate-calculator): Calculate a suggested sponsored content rate from followers, content type, and engagement rate.
- [Affiliate Commission Calculator](https://zelipho.com/calculators/biz/affiliate-commission-calculator): Calculate affiliate commission per sale and project monthly earnings.
- [Conversion Rate Calculator](https://zelipho.com/calculators/biz/conversion-rate-calculator): Calculate conversion rate, expected conversions, or visitors needed, with revenue per visitor.
- [Email Marketing ROI Calculator](https://zelipho.com/calculators/biz/email-marketing-roi-calculator): Calculate email ROI, net profit and return per dollar from revenue or campaign metrics.
- [A/B Test Significance Calculator](https://zelipho.com/calculators/biz/ab-test-significance-calculator): Two-proportion z-test with p-value, uplift and confidence interval for split tests.
- [Sales Pipeline Velocity Calculator](https://zelipho.com/calculators/biz/sales-pipeline-velocity-calculator): Calculate sales velocity (revenue per day) and see which lever improves it most.
- [Freelance Tax Calculator](https://zelipho.com/calculators/biz/freelance-tax-calculator): Estimate US self-employment tax, federal income tax and quarterly payments from net freelance profit.
- [Contractor vs Employee Cost Calculator](https://zelipho.com/calculators/biz/contractor-vs-employee-cost-calculator): Compare the fully loaded annual cost of an employee against a contractor and find the break-even rate.
- [Social Media Pricing Calculator](https://zelipho.com/calculators/biz/social-media-pricing-calculator): Work out a monthly retainer and price per post from your hours, rate, costs and buffer.
- [SEO ROI Calculator](https://zelipho.com/calculators/biz/seo-roi-calculator): Compare SEO spend with revenue from extra organic traffic: ROI and payback period.
- [Proposal Win Rate Calculator](https://zelipho.com/calculators/biz/proposal-win-rate-calculator): Find your proposal close rate, revenue per proposal and proposals needed for a target.
- [Newsletter Revenue Calculator](https://zelipho.com/calculators/biz/newsletter-revenue-calculator): Estimate newsletter income from sponsorship CPM per 1,000 opens and paid subscriptions.
- [AdSense Revenue Calculator](https://zelipho.com/calculators/biz/adsense-revenue-calculator): Estimate AdSense earnings from page views and page RPM, or from CTR and CPC.
- [Podcast CPM Calculator](https://zelipho.com/calculators/biz/podcast-cpm-calculator): Estimate podcast ad revenue from downloads and CPM, or the CPM behind a sponsor's flat price.
- [Email Open Rate Calculator](https://zelipho.com/calculators/biz/email-open-rate-benchmark-calculator): Calculate open, click and click-to-open rates and compare them with published benchmarks.
- [Content Marketing ROI Calculator](https://zelipho.com/calculators/biz/content-marketing-roi-calculator): Compare content spend with conversions: ROI, cost per piece, per visit and per conversion.
- [Refund Rate Calculator](https://zelipho.com/calculators/biz/refund-rate-calculator): Calculate order and dollar refund rates, net revenue and average refund value.
- [Revenue Per Visitor Calculator](https://zelipho.com/calculators/biz/revenue-per-visitor-calculator): Calculate revenue per visitor, profit per visitor and break-even cost per visit.
- [Follower Growth Rate Calculator](https://zelipho.com/calculators/biz/follower-growth-rate-calculator): Calculate follower growth, daily gain, compound monthly rate and months to a goal.
- [Website Traffic Value Calculator](https://zelipho.com/calculators/biz/website-traffic-value-calculator): Estimate what your organic traffic would cost as paid clicks and compare it with SEO spend.
- [eBay Fee Calculator](https://zelipho.com/calculators/biz/ebay-fee-calculator): Calculate eBay's final value fee and net profit, including promoted listings.
- [Discount & Sale Price Calculator](https://zelipho.com/calculators/biz/discount-sale-price-calculator): Calculate sale price from a discount, stack discounts, or reverse to find original price.
- [Bundle Pricing Calculator](https://zelipho.com/calculators/biz/bundle-pricing-calculator): Calculate bundle pricing from individual item prices, with savings and margin.
- [Cost-Plus Pricing Calculator](https://zelipho.com/calculators/biz/cost-plus-pricing-calculator): Calculate a selling price from cost plus markup, with margin comparison.
- [Price Elasticity Calculator](https://zelipho.com/calculators/biz/price-elasticity-calculator): Calculate price elasticity of demand using the midpoint method.
- [AP World History Score Calculator](https://zelipho.com/calculators/edu/ap-world-history-score-calculator): Estimate your AP World History score from MCQ and free response points.
- [AP Statistics Score Calculator](https://zelipho.com/calculators/edu/ap-statistics-score-calculator): Estimate your AP Statistics score, including the Investigative Task.
- [AP Psychology Score Calculator](https://zelipho.com/calculators/edu/ap-psychology-score-calculator): Estimate your AP Psychology score from 75 MCQ and the AAQ/EBQ free response questions.
- [AP Biology Score Calculator](https://zelipho.com/calculators/edu/ap-biology-score-calculator): Estimate your AP Biology score from MCQ and free response points.
- [AP Macroeconomics Score Calculator](https://zelipho.com/calculators/edu/ap-macroeconomics-score-calculator): Estimate your AP Macroeconomics score from multiple choice and long and short free response points.
- [AP Microeconomics Score Calculator](https://zelipho.com/calculators/edu/ap-microeconomics-score-calculator): Estimate your AP Microeconomics score from multiple choice and long and short free response points.
- [AP European History Score Calculator](https://zelipho.com/calculators/edu/ap-european-history-score-calculator): Estimate your AP Euro score from multiple choice, short answer, DBQ and LEQ results.
- [AP US Government Score Calculator](https://zelipho.com/calculators/edu/ap-us-government-score-calculator): Estimate your AP Gov score from multiple choice and four equally weighted free-response questions.
- [AP Language Score Calculator](https://zelipho.com/calculators/edu/ap-language-score-calculator): Estimate your AP Lang score from multiple choice and three essays scored 0 to 6.
- [AP Physics 1 Score Calculator](https://zelipho.com/calculators/edu/ap-physics-1-score-calculator): Estimate your AP Physics 1 score from multiple choice and free-response points.
- [Negative Marking Calculator](https://zelipho.com/calculators/edu/negative-marking-calculator): Calculate exam score with 1/3, 1/4, 1/2 or custom negative marking, plus break-even accuracy for guessing.
- [UPSC Prelims Marks Calculator](https://zelipho.com/calculators/edu/upsc-prelims-marks-calculator): Calculate UPSC Prelims GS Paper I and CSAT marks with one-third negative marking.

## Bill & Electricity Calculators

- [Electricity Bill Calculator India](https://zelipho.com/calculators/bill/electricity-bill-calculator): Estimate monthly electricity bills by Indian state — domestic, commercial, industrial and agriculture DISCOM tariffs, slab-wise.
- [IESCO Bill Calculator](https://zelipho.com/calculators/bill/iesco-bill-calculator): Free IESCO online bill calculator — estimate monthly IESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [LESCO Bill Calculator](https://zelipho.com/calculators/bill/lesco-bill-calculator): Free LESCO online bill calculator — estimate monthly LESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [FESCO Bill Calculator](https://zelipho.com/calculators/bill/fesco-bill-calculator): Free FESCO online bill calculator — estimate monthly FESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [GEPCO Bill Calculator](https://zelipho.com/calculators/bill/gepco-bill-calculator): Free GEPCO online bill calculator — estimate monthly GEPCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [MEPCO Bill Calculator](https://zelipho.com/calculators/bill/mepco-bill-calculator): Free MEPCO online bill calculator — estimate monthly MEPCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [HESCO Bill Calculator](https://zelipho.com/calculators/bill/hesco-bill-calculator): Free HESCO online bill calculator — estimate monthly HESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [SEPCO Bill Calculator](https://zelipho.com/calculators/bill/sepco-bill-calculator): Free SEPCO online bill calculator — estimate monthly SEPCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [PESCO Bill Calculator](https://zelipho.com/calculators/bill/pesco-bill-calculator): Free PESCO online bill calculator — estimate monthly PESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [QESCO Bill Calculator](https://zelipho.com/calculators/bill/qesco-bill-calculator): Free QESCO online bill calculator — estimate monthly QESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [TESCO Bill Calculator](https://zelipho.com/calculators/bill/tesco-bill-calculator): Free TESCO online bill calculator — estimate monthly TESCO/NEPRA electricity bills, residential, commercial, industrial and agriculture tariffs, with FPA, GST, electricity duty and TV fee.
- [AC Bill Calculator](https://zelipho.com/calculators/bill/ac-bill-calculator): Calculate AC power consumption, monthly electricity bills, and inverter energy savings.
- [Cooler Electricity Calculator](https://zelipho.com/calculators/bill/cooler-electricity-calculator): Calculate air cooler power consumption, units consumed (kWh), and monthly bills.
- [Fan Electricity Calculator](https://zelipho.com/calculators/bill/fan-electricity-calculator): Calculate ceiling fan power usage, monthly bills, and BLDC 5-star motor savings.
- [Induction Bill Calculator](https://zelipho.com/calculators/bill/induction-bill-calculator): Calculate induction stove electricity consumption, monthly bills, and LPG gas savings.
- [Pool Salt Calculator](https://zelipho.com/calculators/home/pool-salt-calculator): Calculate how many pounds and bags of salt to add to a saltwater pool from its size and salt level.
- [Recessed Lighting Calculator](https://zelipho.com/calculators/home/recessed-lighting-calculator): Find how many recessed lights a room needs for brightness, plus spacing and wall distance.

## Hardware Test Tools

- [Mouse Test](https://zelipho.com/hardware/mouse-test): Test left, right, middle, back, and forward mouse buttons, scroll wheel, and detect double-click chatter, entirely in the browser.
- [Mouse Click Speed Test (CPS Test)](https://zelipho.com/hardware/mouse-click-speed-test): Measure clicks per second (CPS) over 1s, 5s, 10s, or 60s durations.
- [Mouse Polling Rate Test](https://zelipho.com/hardware/mouse-polling-rate-test): Estimate mouse polling rate in Hz from live browser mousemove events.
- [Scroll Wheel Test](https://zelipho.com/hardware/scroll-wheel-test): Check scroll wheel direction, notches per second, and detect wheel skipping/chatter.
- [APM Test](https://zelipho.com/hardware/apm-test): Measure actions per minute (APM) from combined mouse clicks and keypresses over 15s, 30s, or 60s.
- [Refresh Rate Test](https://zelipho.com/hardware/refresh-rate-test): Estimate a monitor's refresh rate in Hz live in the browser using requestAnimationFrame timing.
- [FPS Test](https://zelipho.com/hardware/fps-test): Measure live frames-per-second under adjustable canvas render load, with current, average, 1% low, and frame time.
- [Ghosting Test](https://zelipho.com/hardware/ghosting-test): Visual test that moves a high-contrast bar across the screen at adjustable speed and contrast to check for monitor ghosting and pixel-response trailing.