Scope Creep Cost Calculator
Find out how much unpaid "just one more" requests are really costing you. Enter your original fee, your rate and the extra hours, and see money left on the table, your effective hourly rate and a suggested change-order price.
What is scope creep - and why does it cost money?
Scope creep is any work that grows past what you and the client agreed. It rarely arrives as one big request. It shows up as "can you just tweak this?", "one more page", "a quick revision" or a mid-project pivot that never gets priced. Each ask feels small. Added together, they can cut your effective hourly rate in half without anyone noticing.
This calculator turns those vague extras into a number. It adds the unpaid hours you already logged, plus estimated hours from "just one more" requests and revision rounds beyond what your quote included. Then it compares that to your original fee so you can see the real rate you are earning - and what a fair change order for the extras would look like.
How the numbers work
- Extra hours = unpaid hours you already worked + (requests x average hours) + (extra revision rounds x hours per round).
- Money left on the table = extra hours x your hourly rate (or day rate / 8).
- Opportunity cost (optional) adds the same amount again, because those hours could have been billed to another client.
- Effective hourly rate = original fee / (original hours + extra hours).
- Suggested change-order price = extra hours x rate x (1 + markup).
Example with the defaults: a $5,000 project estimated at 50 hours ($100/h on paper), plus 12 unpaid hours, 4 small requests at 2 hours each and 2 extra revision rounds at 3 hours. That is 12 + 8 + 6 = 26 extra hours. At $75/h you have left about $1,950 on the table (or $3,900 with opportunity cost). Your effective rate drops to about $65.80/h, and a 15% markup change order for the extras would be about $2,242.50.
What to do with the result
- Use the suggested change-order price as a starting point for a written change note before more unpaid work starts.
- Generate a printable change order with our free change order generator.
- Reference cited industry numbers on our scope creep & late payment statistics page when you need to explain why written approvals matter.
- Read what to do when a client changes project scope and how to write a scope creep clause.
This tool is an estimate for planning and client conversations. It is not legal or accounting advice. Nothing you type is uploaded; the maths runs in your browser.
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Need numbers for a pitch or report? See our scope creep & late payment statistics.
Frequently asked questions
What is a scope creep cost calculator?
It estimates how much unpaid extra work is costing you by converting extra hours into money left on the table, an effective hourly rate and a suggested change-order price.
How do I calculate the cost of scope creep?
Add every unpaid extra hour (logged hours, small requests and revision rounds beyond the included amount), multiply by your rate, then divide your original fee by total hours worked to see your effective rate.
Should I charge for small 'just one more' requests?
Usually yes, or swap them for something already in scope. Even when you waive the fee for goodwill, write the change down so freebies do not silently multiply.
What markup should I put on a change order?
Many freelancers and contractors add 10-25% for disruption, rush work and coordination. Match whatever your contract or industry practice allows.
Does this calculator store my data?
No. Everything runs in your browser and nothing is sent to our servers.