Billable Hours Calculator
Scheduled hours less leave, holidays and non-billable work.
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.
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
Worked example
Full-time consultant with leave, holidays and internal time
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
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Reference: IMA — Statements on Management Accounting — measuring the cost of capacity
Last reviewed:
Common questions
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.
Related tools
Work out the hourly rate to charge a client so that target margin is met after overhead and non-billable time.
Find the true hourly cost of an employee once benefits, payroll cost and overhead are included.
Size a software application from its data and transaction functions before estimating effort or cost.
Estimate development effort, schedule and average team size for a software project of a known size.
Express cloud spend as a cost per customer, per transaction or per other business unit.
Set the rate used to apply manufacturing overhead to jobs for the coming period.