Project Quote Calculator
(Fixed Price From Hours, Rate and Buffer)
Enter the hours you expect the project to take, your hourly rate and any fixed costs. Add a buffer and an optional rush fee to get the price to quote.
Step 1 — Labor Estimate
Software licenses, stock assets, subcontractor fees
Step 2 — Contingency Buffer
Added to labor and fixed costs to cover underestimated time and small changes
Calculated Results
Enter estimated hours and your hourly rate to generate a project quote.
This project quote calculator turns an hours estimate into a fixed price. Enter the hours you expect the job to take, your hourly rate and any fixed costs. Add a buffer for underestimated time and, if the deadline is short, a rush fee. It returns the price to quote and each part of it.
How the Quote Is Calculated
A 40-hour project at $75 an hour is $3,000 of labor. With no fixed costs and a 15% buffer, the buffer is $450 and the quote is $3,450.
Now add $300 of fixed costs and a 20% rush fee. Labor plus fixed costs is $3,300. The buffer is $495, so the subtotal is $3,795. The rush fee is $759 and the final quote is $4,554. After the $300 of fixed costs is paid, the job pays $4,254 for 40 hours, which is $106.35 an hour.
What Happens When the Work Runs Over
A fixed price moves the risk of a wrong estimate from the client to you. The table shows what a $3,450 quote pays per hour, depending on how long the job really takes.
| Hours the job takes | Pay per hour on a $3,450 quote |
|---|---|
| 36 | $95.83 |
| 40 (as estimated) | $86.25 |
| 46 | $75.00 |
| 50 | $69.00 |
| 60 | $57.50 |
At 46 hours the buffer is used up and you are back at your $75 rate. Past that point every extra hour lowers what you earn per hour.
Getting the Hours Estimate Right
- Break the job into parts. Estimate each task separately and add them up. A single figure for the whole job hides the parts you forgot.
- Count the hours around the work. Calls, emails, revisions, file preparation and handover are part of the project.
- Use your own history. If you tracked time on a similar job, compare the estimate with what it really took.
- Write down what is included. State the deliverables and the number of revision rounds. Work outside that list is priced separately.
If you do not have an hourly rate yet, the Freelance Hourly Rate Calculator works one out from your income goal. For ongoing monthly work, see the Agency Retainer Calculator.
How to Use the Project Quote Calculator
- Enter the estimated hours: Type the hours you expect the whole project to take.
- Enter your hourly rate: Type what you charge per hour.
- Add fixed costs: Type costs you pay for this project, such as licenses, stock assets or a subcontractor. Leave it at 0 if there are none.
- Set the buffer: Type a percentage to add for underestimated time and small changes.
- Add a rush fee: Optional. Open the rush fee section and type a percentage for a deadline shorter than normal.
Frequently Asked Questions
How do I calculate a project quote?
Multiply estimated hours by your hourly rate and add fixed costs. Add a buffer as a percentage of that total. For 40 hours at $75 with a 15% buffer: $3,000 + $450 = $3,450.
What is the buffer for?
It covers the gap between your estimate and the time the work really takes. A 15% buffer on a 40-hour estimate pays for 6 extra hours at the same rate. It is not meant to cover new work the client adds later. That is a change to the scope and needs its own price.
How is the rush fee applied?
The rush fee is a percentage of the quote after the buffer. A 20% rush fee on a $3,795 subtotal adds $759.
Does the buffer apply to fixed costs too?
Yes, in this calculator the buffer is a percentage of labor plus fixed costs. If you want it on labor only, leave fixed costs at 0 and add them to the result yourself.
What does the hourly figure under the quote mean?
It is the quote minus fixed costs, divided by the estimated hours. It shows what the job pays per hour if your estimate is right. If the job takes longer, divide the same amount by the real hours.
Should I show the buffer to the client?
That is your choice. The calculator gives one final price and a breakdown for your own use. A fixed quote is normally given as a single price with a written description of what it covers.
Formulas and worked examples checked in October 2026.