Project / Fixed-Bid Price Calculator
Quote a fixed price with confidence: your hours estimate at your rate, plus a buffer for the scope risk every fixed bid carries.
Your details
Rough figures are fine — you can refine later.
How we calculate this
A cost-plus fixed bid with an explicit risk buffer.
1. Base. Estimated hours × your hourly rate.
2. Buffer. Multiply the base by (1 + buffer%) to cover the scope risk a fixed price transfers to you.
3. Fixed costs. Add any pass-through costs (licenses, assets, subcontractors) on top.
So price = hours × rate × (1 + buffer) + fixed costs. Effective hourly = price ÷ estimated hours — the rate you actually earn if the estimate holds. This is a pricing tool, not tax or legal advice.
Primary sources
- Cost-plus project pricing methodology
- Fixed-bid risk-premium practice for service work
A fixed price you won't regret
Clients love a fixed price — one number, no surprises, easy to approve. Freelancers often dread it, because a fixed price transfers all the risk of the work running long onto you. Quote too low and every extra hour comes straight out of your effective rate. This calculator gives you a fixed bid built on your real hourly rate, with a buffer sized to the risk you're taking on.
Enter your honest hours estimate, your hourly rate, a complexity buffer, and any pass-through costs. You get a price to quote and the effective hourly rate you'll earn if the estimate holds.
The buffer is the whole point
The base of a fixed bid is simple: hours × rate. What separates a profitable fixed price from a painful one is the buffer you add for uncertainty.
Think of the buffer as the premium you charge for absorbing the client's scope risk. When you bill hourly, overruns are the client's problem — they pay for every hour. When you quote fixed, overruns are your problem. The buffer is what makes taking on that risk worthwhile.
How much to add depends on how well you know the work:
- 15% or so for familiar, tightly-scoped projects you've done many times.
- 25–30% for a new client, vague requirements, or unfamiliar tools.
- More when the requirements are genuinely fuzzy — or decline the fixed bid and quote hourly until the scope firms up.
Don't forget pass-through costs
Licenses, stock assets, plugins, subcontractors, hosting — anything you pay for on the client's behalf should be added on top of your labor, not buried inside your rate. Bundling them in quietly erodes your margin. List them explicitly so the client sees them and you recover them.
Protecting the bid after you win it
A good fixed price can still lose money if scope creeps. Two habits protect it:
1. Define deliverables and revision limits in writing. A fixed price is only fixed if the scope is fixed. Spell out what's included and how many rounds of revisions. 2. Bill extras as change orders. When the client asks for something beyond the agreed scope, quote it separately at your hourly rate. This isn't being difficult — it's the mechanism that keeps a fixed price fair to both sides.
What this is
A pricing tool, not tax or legal advice. The effective hourly figure it shows assumes your estimate is accurate — the buffer exists precisely because estimates often aren't. Pair a solid number with a clear contract, and a fixed bid becomes a strength rather than a gamble.
Common questions
How do I price a fixed-bid freelance project? + −
Estimate the hours honestly, multiply by your hourly rate, then add a buffer for the risk that the work runs long. Add any pass-through costs (licenses, stock, subcontractors). The buffer is essential — with a fixed price, every hour over your estimate comes straight out of your effective rate.
What complexity buffer should I use? + −
For well-scoped, familiar work, 15% is often enough. For vague requirements, a new client, or unfamiliar tech, 25–30% or more is prudent. The buffer isn’t padding — it’s the premium you charge for absorbing the client’s scope risk instead of billing them hourly.
Fixed price or hourly — which should I quote? + −
Fixed price rewards efficiency and gives the client budget certainty, but you carry the risk of overruns. Hourly is safer for open-ended or evolving work. A common approach: estimate hourly, quote a fixed price derived from it (with a buffer), and cap scope in the contract.
How do I protect a fixed bid from scope creep? + −
Define deliverables and revision limits in writing, and bill anything beyond them as a change order at your hourly rate. Our Cost of Scope Creep calculator shows what unbilled extra work actually costs you.
Keep going
Prepared for tax year 2026. Every rate and cap on this page cites a primary IRS or SSA source. Estimates only — not tax or financial advice. — for planning purposes only, not tax, legal, or financial advice.