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Small business / Free tool

Billable hours and utilisation calculator

Compare available time with billable time and estimate revenue at your entered rate.

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Choose the question you want to answer.
Display only. No currency conversion.
Required. Greater than 0. Use up to 6 decimal places, without commas or currency symbols.
Required. 0 or more. Use up to 6 decimal places, without commas or currency symbols.
Required. 0 or more. Use up to 6 decimal places, without commas or currency symbols.

Example values are prefilled. Change any number to calculate.

Billable utilisation

62.5%

Estimated billable revenue
£1,250.00
Non-billable hours
15 hours

Use hours from the same period. Billable hours ÷ available hours measures utilisation. Revenue assumes every billable hour is charged at the entered rate; it is not take-home pay or profit.

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The working behind the answer

How to use this calculator

Use hours from the same week, month or other chosen period. Define available hours consistently so comparisons remain meaningful. Billable time cannot exceed the available hours in this model. Enter a zero rate if you only want the utilisation calculation.

The formula

Review one working period

Utilisation = billable hours ÷ available hours × 100; revenue = billable hours × rate

A worked example

With 40 available hours and 25 billable hours, utilisation is 62.5%. At £50 per hour, estimated billable revenue is £1,250 and 15 hours are non-billable.

Good to know

Revenue assumes every billable hour is charged at one rate. It does not account for write-offs, collection delays, overheads or taxes. High utilisation is not automatically the best operating target; the calculator does not prescribe one.

Common questions

Does available time include holidays?

Use whichever availability definition fits your analysis, and keep it consistent between periods.

Is estimated revenue take-home pay?

No. It is the amount implied by the entered billable hours and rate before unentered costs and deductions.