Add a deliberate time cushion to a freelance proposal project before you quote the schedule or reserve calendar space. The calculator starts with your best estimate of hands-on proposal work and applies separate allowances for revision risk and coordination or uncertainty.
This is useful when a proposal depends on incomplete client inputs, several stakeholders, or a review process that can expand after the first draft. The output separates planned work from buffer time so you can see exactly how much contingency is being added rather than hiding it inside a vague estimate.
1. Enter the clean-scope estimate
Start with the hours you expect if requirements are complete and the work proceeds normally.
2. Add revision allowance
Enter a percentage for likely revision cycles beyond the clean first-pass estimate.
3. Add coordination risk
Use the second buffer for stakeholder meetings, missing inputs, handoffs, or other execution uncertainty.
4. Use the buffered total
Reserve the resulting hours in your schedule or use them as the effort basis for a fixed-fee quote.
This is an additive percentage model. It is intended for planning time, not for predicting every possible scope change.
The main result is the project-hour estimate after adding both selected contingency allowances to the base proposal effort.
Results depend on the assumptions you enter; use realistic inputs and update them when workload, costs, or pricing conditions change.
Given:
Calculation:
Total buffer = 20% + 8% = 28%
Added buffer = 14 × 0.28 = 3.92 hr
Buffered hours = 14 + 3.92 = 17.92 hr
Result:
17.9 hours after rounding to one decimal place.
The estimate reserves nearly four extra hours for likely friction. If the project contract limits revisions explicitly, you may choose a lower revision allowance.
They represent different sources of overrun. Keeping them separate makes the estimate easier to adjust when one risk is high and the other is low.
Yes. A zero value means you are using the base estimate without that category of contingency.
No. This calculator adds time capacity, while a rush fee changes price for compressed scheduling or priority handling.
A buffer can absorb small uncertainty, but a material scope change may require a new estimate or change order rather than consuming all contingency.
That depends on your pricing model. You can use the total internally for capacity planning even when the client sees only a fixed project fee or milestone schedule.