Interactive financial calculator
Billable Hours Calculator
Estimate realistic billable capacity after working weeks, time off, and recurring administration, with an optional utilization benchmark.
- Free to use
- No account required
- Inputs stay in your browser
Methodology & Assumptions
How this estimate is calculated
Formula: gross annual hours = weekly hours × potential working weeks. Workday hours = weekly hours ÷ working days. Time off reduces the active-week equivalent first; weekly admin hours are then applied only to the remaining active weeks. Effective utilization = estimated billable capacity ÷ gross annual hours.
Illustrative result: figures are rounded for display after calculations use full numeric precision. Actual results may differ.
What Billable Capacity Means
Billable capacity is the part of a work schedule that remains available for client delivery after planned leave and internal work. It is not the same as total time at work. Sales, proposals, administration, bookkeeping, learning, and project gaps can all be nonbillable.
How Time Off Is Counted
Gross annual hours equal weekly hours multiplied by potential working weeks. The calculator derives workday hours by dividing weekly hours by working days per week, then subtracts vacation, public holidays, and sick or personal days once. To avoid double-counting, do not also remove those same days by reducing working weeks.
Admin hours are applied only across the active-week equivalent left after time off, so a fully nonworking week is not also assigned admin time. If total leave and admin time exceed gross hours, the page shows a validation error instead of a negative capacity.
Worked Example
At 40 hours per week for 52 potential weeks, gross annual hours are 2,080. With a five-day week, each workday is eight hours. Fifteen vacation days, 10 holidays, and five personal days remove 240 hours, leaving 46 active-week equivalents. Ten admin hours across those active weeks remove another 460 hours, leaving an estimated 1,380 billable hours, or about 66.3% effective utilization.
From Capacity to Pricing
This calculator intentionally does not estimate target revenue or an hourly rate. Once you have a realistic capacity, use the Freelance Rate Calculator to combine it with income goals and business costs. The Hourly to Salary Calculator can compare gross pay formats separately.
Frequently Asked Questions
What is utilization?
Here, effective utilization is estimated billable capacity divided by gross annual work hours. The optional target is a benchmark and does not change the calculated capacity.
Should I enter 52 working weeks if I take vacation?
Yes, if vacation is entered separately as days. Reduce working weeks only for additional full weeks that are not already represented in the time-off fields.
Does every available client-work hour become billable?
Not necessarily. The result is a capacity estimate. Scheduling gaps, scope changes, sales activity, and unexpected nonbillable work can reduce actual billed time.
Does the calculator include revenue or rates?
No. It stays focused on time capacity to avoid duplicating the Freelance Rate Calculator.