Billable Hours Calculator
Scheduled hours less leave, holidays and non-billable work.
In short
Scheduled hours less leave, holidays and non-billable work.
Formula: Scheduled hours = Weeks × Hours per week; Available hours = Scheduled − Leave − Holidays; Billable hours = Available − Training − Internal hours
Billable hours per year
2,080 hours
- Scheduled hours
- 2,080 hours
- Available hours after leave and holidays
- 2,080 hours
- Non-billable hours
- 0 hours
- Utilisation of available hours
- 100.00%
Calculated from the values you entered. Formula version 1; last reviewed 2026-09-16.
What this calculator does
Subtraction of the hours the user enters from the schedule they enter. No standard working year, leave entitlement or holiday count is assumed.
Use it to turn Weeks in the year worked, Scheduled hours per week, Annual leave hours, Public holiday hours, and the other shown inputs into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this professional & industry calculation.
Inputs and what they mean
- Weeks in the year worked
- — number value.
- Scheduled hours per week
- — number value.
- Annual leave hours
- — number value.
- Public holiday hours
- — number value.
- Training hours
- — number value.
- Internal and admin hours
- — number value.
How to use it
- Enter your own figures — the calculator never fills in a rate, price or benchmark for you.
- Press Calculate to see the result.
- Read the formula, variables, assumptions and source below the result before you rely on it.
Formula
Scheduled hours = Weeks × Hours per week; Available hours = Scheduled − Leave − Holidays; Billable hours = Available − Training − Internal hours.
Inputs used: Weeks in the year worked, Scheduled hours per week, Annual leave hours, Public holiday hours, Training hours, Internal and admin hours.
Edge handling: Weeks in the year worked is required.; Weeks in the year worked cannot be negative.; Weeks in the year worked must be no more than 1000000000000.; Scheduled hours per week is required.; Scheduled hours per week cannot be negative..
Worked example
Full-time consultant with leave, holidays and internal time
- Start with Weeks in the year worked: 52, Scheduled hours per week: 40, Annual leave hours: 160, Public holiday hours: 80, Training hours: 40, Internal and admin hours: 200.
- Apply the method: Scheduled hours = Weeks × Hours per week; Available hours = Scheduled − Leave − Holidays; Billable hours = Available − Training − Internal hours.
- Every deduction is entered, so no standard working year is assumed.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this billable hours calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: IMA — Statements on Management Accounting — measuring the cost of capacity
Last reviewed:
Common questions
Where does this formula come from?
Institute of Management Accountants, Statements on Management Accounting — measuring the cost of capacity (practical capacity). See the source link on this page.
What kind of calculation is this?
Scheduled time less time away and less non-billable work gives the hours that can be billed. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.
What are its limits?
Capacity is not demand: available hours will only be billed if there is work to do. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.
How do I use the Billable Hours Calculator?
Enter the required values for Weeks in the year worked, Scheduled hours per week, Annual leave hours, Public holiday hours, Training hours, and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Billable Hours Calculator use?
Scheduled hours = Weeks × Hours per week; Available hours = Scheduled − Leave − Holidays; Billable hours = Available − Training − Internal hours The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.
Can the Billable Hours Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Formula, source and verification
Scheduled time less time away and less non-billable work gives the hours that can be billed.
The question it answers: How many hours can this person realistically bill in a year?
The formula
Scheduled hours = Weeks × Hours per week; Available hours = Scheduled − Leave − Holidays; Billable hours = Available − Training − Internal hours
- W — Weeks worked
- (weeks). Weeks in the working year.
- h — Scheduled hours per week
- (h). Contracted hours each week.
- L — Leave hours
- (h). Annual leave taken.
- P — Public holiday hours
- (h). Paid public holidays.
- T — Training hours
- (h). Non-billable training.
- A — Internal hours
- (h). Internal and administrative work.
Units: Hours; weeks.
What kind of calculation this is
Deterministic formula. The same inputs always give the same answer. The maths is fixed and does not depend on judgement.
Method
Subtraction of the hours the user enters from the schedule they enter. No standard working year, leave entitlement or holiday count is assumed.
Assumptions built into the result
- Mathematical: All hour figures cover the same year.
Figures this calculator will never guess for you
- No default leave, holiday or utilisation figure is inserted.
Limitations
- Capacity is not demand: available hours will only be billed if there is work to do.
Source and version
- Standard or reference
- Practical capacity (Institute of Management Accountants, Statements on Management Accounting — measuring the cost of capacity (practical capacity).)
- Published source
- IMA — Statements on Management Accounting
- Formula version
- Version 1
- Verification
- Reviewed against the cited source on
- How much weight the source carries
- Standards or government
- Applies to
- Currency
- The result is a ratio or index, so it does not depend on currency.
Cite this page
Free Calculator. (2026, September 16). Billable Hours Calculator. https://freecalculator.tech/tools/billable-hours-calculator
"Billable Hours Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/billable-hours-calculator.
Billable Hours Calculator — Free Calculator, https://freecalculator.tech/tools/billable-hours-calculator
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