How to use this calculator
- Enter the values from your current project or work period.
- Use realistic costs and time, including unpaid or nonbillable work.
- Select Calculate to update every result.
- Change one assumption at a time to compare scenarios.
#2592 · Salary & HR Tool
Freelance Revision Project Buffer Calculator
Build a defensible time cushion into a freelance project before revisions begin. Enter the planned production and revision hours, your expected rework percentage, and a delivery horizon. The result separates the contingency allowance from the planned work, then converts the combined workload into a daily target. It helps prevent revision requests from silently consuming the time reserved for other clients.
Calculator
Revision contingency planFormula
Contingency hours = (production hours + planned revision hours) × buffer percentage. Buffered hours = planned hours + contingency hours.
What the result means
Use the main result as a planning threshold under the assumptions entered. Secondary results explain the time, rate, revenue, or cost components behind that threshold.
Estimates are for planning only. Contract terms, local tax rules, actual expenses, and working conditions may produce different results.
Example calculation
A 24-hour build plus 6 planned revision hours equals 30 hours. A 20% buffer adds 6 hours, producing 36 buffered hours, or 7.2 hours per day across 5 working days.
Tips for better results
- Use recent records instead of ideal estimates.
- Keep billable time separate from total time worked.
- Include project-specific costs before evaluating the result.
- Run a conservative scenario for uncertain workload or demand.
- Recalculate whenever scope, deadlines, fees, or expenses change.
Frequently asked questions
What is included in planned project time?
Original production hours and planned revision hours are added before the rework buffer is applied.
How is the rework buffer calculated?
The selected percentage is applied to the combined production and revision time.
Why does the calculator show hours per day?
Buffered total hours are divided by the number of working days to show the daily workload required.
Can working days include partial days?
No. Enter a whole number of working days between 1 and 365.
Does the buffer guarantee an on-time delivery?
No. It is schedule protection for rework, not a guarantee against every delay.
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Inputs used in this estimate
| Input | Meaning |
|---|---|
| Original production hours | Measured in h |
| Planned revision hours | Measured in h |
| Rework buffer | Measured in % |
| Working days until delivery | Measured in days |