A freelance additional-work fee example

Work through five extra hours at USD 80 and understand what the USD 400 baseline does—and does not—include.

Start with quantities, not an arbitrary percentage

Imagine a fixed-price USD 2,400 website project. The client requests a booking page outside the agreed deliverables. You estimate four hours to implement and test the addition plus one hour for an extra revision. These are fictional inputs, not benchmarks for a real booking integration. The point is to make the estimate explainable, not to prescribe a market rate.

Keep the calculation visible

Five hours multiplied by USD 80 per hour is USD 400. Relative to the original USD 2,400 project, that is about 16.67%. The percentage is context, not a rule that all changes should cost that fraction. If the same work actually takes eight hours, the baseline at that rate becomes USD 640. Revisit the estimate when assumptions change rather than disguising extra work inside a rounded percentage.

Separate money from the calendar

Five hours of effort does not necessarily mean delivery tomorrow. Your existing commitments, dependencies, and availability still matter. Discuss a proposed new date separately. Likewise, the hourly baseline does not include taxes, currency conversion, out-of-pocket costs, or a contractual entitlement. Decide those outside the calculator and review the final proposal.

Use the smallest useful next step

Try your own non-sensitive hours and rate in the free calculator. If a handwritten proposal already works, you do not need another product. AddBriefly is relevant when you repeatedly copy the same inputs between pricing, a schedule note, and a client message. It adds consistency, not an automatic estimate, contract, invoice, or payment guarantee.

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