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Billable Time & Fee Calculator

Calculate a fee from billed time and a rate, or solve for the time or rate.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

At 80 per hour, 7.5 billable hours produce a fee of 600 before taxes, expenses or additional charges.

Fee = billable time × rate per matching time unit

Worked example

Enter these known values and leave the other values blank.

Billable rate
80 USD / hrs
Billable time
7.5 hrs
Billable value
600 USD

Assumptions and limitations

  • No. Enter the billable time after applying your agreed billing policy. This model multiplies time by one rate and excludes taxes, expenses, minimum charges and different rates for different tasks.

Common questions

Does this round time to a billing increment?

No. Enter the billable time after applying your agreed billing policy. This model multiplies time by one rate and excludes taxes, expenses, minimum charges and different rates for different tasks.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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