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Billable Utilization Calculator
Enter available hours and billable hours for a week, month, or year to see your billable utilization, the nonbillable share, and how far you are from a target.
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Billable Utilization Calculator calculates in your browser.
Measure billable utilization
Billable utilization is the share of available working time that was billed to clients. Consultancies, agencies, law and accounting firms, and freelancers use it to plan capacity and pricing. This calculator divides billable by available hours, compares the result with a target in both percentage points and hours, and can break down where the nonbillable time went. It measures how time was used, not how valuable it was — training, sales, and internal work are part of the job.
How to use the Billable Utilization Calculator
- Choose whether your hours are for a week, a month, or a year.
- Enter the hours available in that period and the hours that were billable.
- Optionally enter a target utilization to see the gap.
- Optionally split the nonbillable hours into admin, training and internal work, sales, and other.
- Read the utilization, the nonbillable share, and the gap to target.
The formula
Utilization = billable hours ÷ available hours × 100
Nonbillable share = 100% − utilization
Target hours = available hours × target utilization
Gap = utilization − target (points), or billable hours − target hours
The same 10-point gap means 4 hours in a 40-hour week but 16 hours in a 160-hour month, which is why the gap is shown in hours as well as points.
| Available | Billable | Target | Utilization | Against target |
|---|---|---|---|---|
| 40 a week | 30 | — | 75% | — |
| 160 a month | 112 | 80% | 70% | −10 points (16 hours short) |
| 40 a week | 34 | 75% | 85% | +10 points (4 hours over) |
| 1,800 a year | 1,260 | 70% | 70% | On target |
| 40 a week | 0 | — | 0% | — |
Calculated on your device
- The calculation runs in your browser as you type; nothing is sent to a server.
- Your hours, targets, and results are not sent to Looty Tools or stored.
- The calculator area is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- Utilization measures the share of available hours that were billed — not how productive or valuable the time was. Training, sales, internal projects, and admin are real work, and a rate near 100% leaves no room for them or for rest. A sensible target depends on the role and the firm.
- The period only labels the hours; nothing is converted between weeks, months, and years. Enter hours for one period at a time.
- Billable hours can’t exceed available hours. Overtime billed above the available hours should be added to the available hours too.
- Utilization doesn’t account for rates, write-offs, or unpaid invoices — a billed hour here is any hour recorded as billable.
Related calculators
- Annual Work Hours CalculatorAdd up work hours across a year from the schedule you enter.
- FTE CalculatorConvert a work schedule into a full-time equivalent.
- Billable Hours Target CalculatorFind the billable hours needed to hit a target you set.
Guides
- Utilization RateWhat the billable utilization rate measures, why the choice of available hours changes the answer, and how utilization differs from realization and collected revenue.
- Utilization vs ProductivityWhy a high billable utilization rate isn’t the same as productivity: a worked comparison, the costs of running at capacity, and better measures to read alongside utilization.
- Nonbillable TimeThe common kinds of nonbillable time, the gray areas such as travel and fixing your own mistakes, and a worked week showing where 12 nonbillable hours went.
- Billable Hours NeededTurn a revenue goal into billable hours: the formula, a rate-by-rate table for a $120,000 target, what to do when the hours don’t fit, and how booked work changes the plan.
Billable Utilization Calculator FAQ
- How do you calculate billable utilization?
- Divide billable hours by available hours and multiply by 100. 30 billable hours out of 40 available is 75% utilization, and the other 25% is nonbillable.
- What should count as available hours?
- Usually the hours someone is scheduled or expected to work in the period, less holidays and time off. Some firms use a fixed standard instead, such as 2,080 hours a year, which makes utilization look lower in weeks with time off. Pick one definition and use it consistently.
- What is a good billable utilization rate?
- It depends on the role. Delivery staff are often targeted somewhere around 70–85%, while managers, sales, and senior staff are expected to bill much less because their nonbillable work matters. A target near 100% leaves no time for training, admin, or finding the next piece of work.
- Is higher utilization always better?
- No. Utilization measures the share of time billed, not productivity or profit. Sustained very high utilization can mean no time for training, business development, or rest, and billable hours at a low or discounted rate can be worth less than fewer hours at a full rate.
- How far am I from my utilization target?
- The calculator shows the gap two ways. 112 billable hours out of 160 is 70%; against an 80% target that is 10 percentage points — or 16 billable hours — short.
- Are the hours and dates I enter sent anywhere?
- No. The calculation runs in your browser as you type. Your hours, dates, and results are not sent to Looty Tools or stored, and the calculator area is masked from session-recording analytics. Refreshing the page clears it.
