CAC Calculator
(Customer Acquisition Cost Tool)
This free CAC calculator helps you instantly calculate Customer Acquisition Cost and plan the budget needed to hit your growth goals. Add LTV and monthly revenue to see your LTV:CAC ratio and payback period.
Step 1 — Calculation Goal
What would you like to calculate?
Step 2 — Core Metrics
All ad spend plus sales/marketing salaries, tools, and overhead for the period
Total new paying customers gained in the same period
CAC Result
💡 Formula Guide
Related Calculators
What Is CAC? (Customer Acquisition Cost — Explained)
CAC, or Customer Acquisition Cost, is the total sales and marketing cost required to acquire one new paying customer. It is a core financial metric for subscription businesses and startups because it measures the true, fully-loaded cost of growth — not just ad spend, but the whole cost stack behind winning a customer.
CAC is closely related to CPA (Cost Per Acquisition), but the two are usually scoped differently. CPA is typically limited to paid-advertising spend divided by conversions from that specific campaign. CAC is broader: it includes ad spend plus sales salaries and commissions, marketing team payroll, software tools, content production, and agency fees — anything spent to win customers, divided by how many were actually won. Investors and SaaS finance teams use CAC because it reflects the real, blended cost of growth across every channel and team, not one campaign in isolation.
The CAC Formula
CAC Calculation Example
Suppose a company spent $12,000 on combined sales and marketing in a month and acquired 60 new customers.
Whether $200 is efficient or too high depends entirely on how much revenue that customer generates — which is why this calculator's optional LTV and monthly revenue fields turn a raw CAC number into an actual sustainability check.
LTV:CAC Ratio — The Standard Growth-Efficiency Benchmark
The LTV:CAC ratio compares what a customer is worth over their lifetime to what it cost to acquire them — it is one of the most-cited health metrics in SaaS and subscription business analysis.
| LTV:CAC Ratio | What It Generally Signals |
|---|---|
| Below 1:1 | Losing money on every customer acquired — unsustainable |
| 1:1 – 3:1 | Marginally profitable; thin buffer for rising costs or churn |
| 3:1 – 5:1 | Widely cited as a healthy, efficient range for scaling spend |
| Above 5:1 | Can signal underinvestment in growth relative to customer value |
The 3:1 benchmark is a commonly referenced rule of thumb in SaaS metrics literature, not a strict law — early-stage, well-funded companies often deliberately run lower ratios to grow faster, while capital-constrained businesses need higher ratios to stay solvent. Treat it as a directional guide, and weigh it against your own runway, margins, and growth stage.
CAC Payback Period — How Fast You Recover Acquisition Cost
CAC payback period measures how many months it takes for a customer's recurring revenue to recover the cost of acquiring them. It matters most for subscription and recurring-revenue businesses, since it directly affects cash flow — a company can have a great LTV:CAC ratio and still run out of cash if payback takes too long.
Example: A $200 CAC with $50 in average monthly revenue per customer gives a payback period of 4 months ($200 ÷ $50). Public SaaS benchmark reports generally treat under 12 months as healthy, with capital-efficient companies often targeting under 6 months — but the right target depends heavily on your gross margin and how much runway you have.
How to Use This Free CAC Calculator
Step 1 — Choose Your Calculation Goal
- Customer Acquisition Cost (CAC): You know your spend and new customers — calculate your CAC
- Required Budget: You have a customer target and target CAC — calculate how much to spend
- Expected New Customers: You have a budget and known CAC — forecast how many customers to expect
Step 2 — Enter Core Metrics
- Total Sales & Marketing Spend: Ad spend plus sales/marketing salaries, tools, and overhead for the period (e.g., $12,000)
- New Customers Acquired: Total new paying customers in that same period (e.g., 60)
Step 3 — Optional: LTV & Payback Settings
- Customer Lifetime Value (LTV): Total expected revenue from one customer over their lifetime — unlocks the LTV:CAC ratio
- Avg. Monthly Revenue per Customer: Used to calculate CAC payback period in months
💡 Pro Tip: Use fully loaded spend (not just ad spend) for the most accurate CAC. If you only enter ad spend, you're really calculating a CPA, not a true CAC — see our CPA Calculator for that narrower metric.
Frequently Asked Questions About CAC
What does CAC stand for?
CAC stands for Customer Acquisition Cost — the total sales and marketing cost required to acquire one new paying customer. Formula: CAC = Total Sales & Marketing Spend ÷ New Customers Acquired.
How is CAC different from CPA?
CPA usually covers only paid ad spend divided by conversions from a specific campaign. CAC is broader and fully loaded — ad spend plus sales and marketing salaries, tools, and overhead, divided by new customers won across all channels.
What is a good LTV:CAC ratio?
A 3:1 ratio is the most commonly cited benchmark for healthy growth efficiency. Below 1:1 means you lose money per customer; above 5:1 may mean you're underinvesting in growth. These are general guidelines that vary by stage and funding situation.
How do I calculate CAC payback period?
CAC Payback Period = CAC ÷ Average Monthly Revenue per Customer. It shows how many months it takes to recoup acquisition cost from recurring revenue — commonly benchmarked under 12 months, with under 6 months considered strong.
What should be included in 'sales and marketing spend'?
A fully loaded CAC includes ad spend, sales team salaries and commissions, marketing payroll, software subscriptions, content production, and agency fees for the period — divided by new customers acquired in that same period.
Does CAC apply outside of SaaS?
Yes. While CAC is most associated with SaaS and subscription metrics, the same formula applies to any business — ecommerce, marketplaces, apps — that wants to know the fully loaded cost of winning one new customer, as opposed to just the ad-spend-only CPA figure.
Last Updated: September 2026 | CAC and LTV:CAC benchmarks reflect commonly cited ranges from SaaS metrics literature and venture-capital growth-efficiency reporting.