Accountants Utilisation Rate Formula
Learn how hourly accountant utilisation is calculated from billable and non-billable recorded hours.
Hourly utilisation estimates the share of recorded working time spent on billable client work. It helps show time allocation for a chosen period and compare that result with an internal target.
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Hourly utilisation rate
Where:
Add all recorded working hours, divide billable hours by that total, and multiply by 100.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| billableHours - Billable hours | Recorded hours assigned to client work that can be charged or recovered. | hours |
| nonBillableHours - Non-billable working hours | Recorded working hours for administration, training, meetings, business development, and other non-chargeable work. | hours |
| targetUtilisationRate - Target utilisation rate | The percentage benchmark used for comparison. | percent |
| totalRecordedHours - Total recorded working hours | The combined billable and non-billable hours for the same period. | hours |
Step-by-Step Calculation
Add recorded hours
Use billable and non-billable hours from the same reporting period.
totalRecordedHours = billableHours + nonBillableHours
Calculate utilisation
This expresses billable time as a percentage of all recorded working time.
utilisationRate = (billableHours / totalRecordedHours) * 100
Calculate target billable hours
This shows the billable hours that would equal the selected target at the same total hours.
targetBillableHours = totalRecordedHours * (targetUtilisationRate / 100)
Calculate the billable-hours gap
A result of zero means the target has been met or exceeded.
billableHoursGap = max(0, targetBillableHours - billableHours)
Calculate variance from target
The variance is measured in percentage points, not as a percentage change.
utilisationVariance = utilisationRate - targetUtilisationRate
Weekly accountant utilisation calculation
Total recorded hours
28 + 7
35 hours
Utilisation rate
(28 / 35) * 100
80.0%
Target billable hours
35 * (80 / 100)
28 hours
Additional billable hours needed
max(0, 28 - 28)
0 hours
Variance from target
80.0 - 80.0
0.0 percentage points
Final Result
The accountant's hourly utilisation rate is 80.0%, which meets the 80% target.
Assumptions
- ✓Billable and non-billable hours are recorded consistently and cover the same period.
- ✓Billable hours are treated as client-chargeable or recoverable time under the firm's definitions.
- ✓All non-billable working time is included in the denominator.
- ✓The target is an internal management benchmark rather than a universal standard.
Limitations
- !Utilisation measures time allocation, not fees billed, cash collected, profit, or client realisation.
- !Missing, delayed, or incorrectly coded timesheets can materially affect the result.
- !Leave, public holidays, and unrecorded time are excluded unless they are included in the entered hours.
- !Different job roles can reasonably have different expected utilisation levels.
Common Mistakes to Avoid
Comparing billable hours from one period with non-billable hours from another.
Leaving out internal meetings, training, or administration from non-billable hours.
Treating a percentage-point variance as a percentage change.
Using utilisation as if it were the same measure as realisation or profitability.
Including leave hours when the firm's reporting policy excludes them.
Related Formulas
Frequently Asked Questions
What is the formula for accountant utilisation rate?
Divide billable hours by total recorded working hours and multiply by 100. Total recorded hours equal billable plus non-billable hours.
How are target billable hours calculated?
Multiply total recorded hours by the target utilisation rate expressed as a decimal.
What does a negative utilisation variance mean?
It means actual utilisation is below the selected target by that number of percentage points.
Can utilisation be over 100%?
Not when billable hours are a subset of total recorded hours. A result above 100% usually indicates inconsistent inputs.
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