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On a fixed-fee project, every hour beyond what you estimated when quoting is an hour you are effectively working for free, since the client already agreed to pay a set amount regardless of how long it actually takes. Scope creep, small extra requests that individually feel reasonable, adds up over a project into real, uncompensated hours that directly cut into your effective hourly rate.
This calculator divides your agreed fee by the hours you originally estimated to get your planned hourly rate, then divides the same fee by the hours you actually worked to get your real, effective hourly rate. The gap between actual and estimated hours is the extra, unpaid time, and multiplying that by your planned rate gives you the dollar value of the scope creep.
A concrete dollar figure is a far stronger opener for a change-order or scope conversation than a vague sense that a project is running long. Track this on a few projects and a pattern will usually show up, if scope creep is consistently eating 20 percent or more of your fee, your quoting process, not just this one client, likely needs a change.
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