Accountants Daily Utilisation Rate Formula
Learn how daily accountant utilisation is calculated from billable hours, total working hours and a selected target.
Daily utilisation estimates the share of a working day spent on billable client work. It helps show how recorded billable time compares with the full day and with a planning target.
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Daily utilisation rate
Where:
Divide the hours that can be charged to clients by all hours worked that day, then multiply by 100 to express the result as a percentage.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| billableHours - Billable hours today | Time recorded for client work that is chargeable under the firm's billing approach. | hours |
| totalWorkHours - Total working hours today | All time worked during the day, including billable and non-billable activities. | hours |
| targetUtilisationRate - Target utilisation rate | The daily billable-time percentage used as a comparison benchmark. | percent |
| targetBillableHours - Target billable hours | Billable hours required to achieve the selected target during the recorded working day. | hours |
Step-by-Step Calculation
Record all working time
Total working hours should include client delivery, administration, internal meetings, training and other work completed that day.
totalWorkHours = billableHours + nonBillableHours
Calculate daily utilisation
This converts the billable share of the day into a percentage.
utilisationRate = (billableHours / totalWorkHours) * 100
Find non-billable time
This identifies working time not recorded as billable client work.
nonBillableHours = totalWorkHours - billableHours
Calculate the target billable time
The target percentage is applied to the actual length of the working day.
targetBillableHours = totalWorkHours * (targetUtilisationRate / 100)
Calculate the shortfall and variance
The gap cannot be below zero, while the variance can be positive or negative percentage points.
billableHoursGap = max(0, targetBillableHours - billableHours); utilisationVariance = utilisationRate - targetUtilisationRate
Example: 5.5 billable hours in a 7.5-hour day
Calculate utilisation rate
(5.5 / 7.5) * 100
73.3%
Calculate non-billable hours
7.5 - 5.5
2.00 hours
Calculate target billable hours
7.5 * (75 / 100)
5.625 hours
Calculate billable-hours gap
max(0, 5.625 - 5.5)
0.125 hours
Calculate variance from target
73.3 - 75.0
-1.7 percentage points
Final Result
Daily utilisation is 73.3%, with 2.00 non-billable hours and a 0.125-hour gap to a 75% target.
Assumptions
- ✓Billable hours are classified consistently with the firm's time-recording and engagement practices.
- ✓Total working hours include both chargeable and non-chargeable work completed on the same day.
- ✓The selected target is a user-defined planning benchmark rather than a universal standard.
- ✓Time entries are complete and use the same time unit.
Limitations
- !The calculation measures time allocation, not the quality, profitability, recoverability or collection of work.
- !A single day can be atypical because of training, internal meetings, client delays or business development activity.
- !A higher utilisation result does not necessarily indicate a better workload balance.
- !The result does not distinguish between different charge-out rates or types of client work.
Common Mistakes to Avoid
Entering only client-related time as total working hours and excluding administration or internal meetings.
Treating work as billable when it cannot be charged under the relevant engagement or firm policy.
Comparing a rounded utilisation percentage with an unrounded billable-hours target.
Using a daily target that does not allow for necessary training, supervision or internal responsibilities.
Entering billable hours that exceed total working hours.
Related Formulas
Frequently Asked Questions
What is the formula for daily accountant utilisation?
Daily utilisation equals billable hours divided by total working hours, multiplied by 100.
How are billable hours needed for a target calculated?
Multiply total working hours by the target utilisation rate expressed as a decimal. For example, use 0.75 for a 75% target.
What does a negative utilisation variance mean?
It means actual utilisation was below the selected target by that number of percentage points.
Why is the gap to target shown as zero when utilisation exceeds target?
The gap measures additional billable hours needed, so it is capped at zero once the target is met or exceeded.
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