Added cost
Sum of added hours × internal hourly cost + added direct costs
Use nonnegative additions. This tool does not estimate refunds, reduced scope or schedule changes.
Free agency calculator · No signup
What does one more request do to your margin?
Put a number behind the extra work. Compare the agreed baseline with an added request, then see the remaining fee gap at your chosen margin.
Private by design. Your inputs and comparisons stay in this tab.
How to use the agency scope creep calculator
Add the request’s internal delivery and direct costs to the baseline project cost. Add only approved extra fees to revenue. Compare the revised margin with the baseline, then calculate any remaining fee needed for your target margin. A fee gap is a scenario result, not client approval or an invoice.
Make the assumptions yours
A clearer decision
starts with your numbers.
The starting values are an example, not industry benchmarks. Use a consistent currency and cost basis.
Nothing hidden in the math
How the calculation works
Calculations use unrounded values. Results are rounded for display only.
Revised project
Revised cost = baseline cost + added cost; revised fee = baseline fee + approved extra fee
The baseline uses the same cost definitions as the project profitability calculator. Avoid counting overhead twice.
Margin change
Revised margin − baseline margin
The difference is in percentage points. A change from 40% to 30% is a fall of 10 percentage points.
Remaining fee gap
Maximum of 0 and [revised cost ÷ (1 − target margin ÷ 100) − revised fee]
Approved extra fees are already in the revised fee and are subtracted exactly once.
Before you decide
Common questions
Is the fee gap an amount I can invoice now?
No. It is the extra fee implied by your scenario and target margin. Confirm the scope, commercial agreement and authorized decision before invoicing.
What if the client already approved an extra fee?
Enter it in the approved extra fee field. It increases revised revenue and reduces the remaining gap. Do not enter it again as a separate fee.
Can this estimate the delivery delay?
No. It estimates cost and margin impact only. Assess dependencies, role capacity and revised dates separately.
One decision leads to the next
Keep your planning connected.
Prepared by ClientCee. Details checked . Examples are illustrative.
Put it into practice