The utilization rate formula is (billable hours ÷ available hours) × 100. If a consultant logs 120 billable hours in a month with 160 available hours, the rate is 75%. The math takes ten seconds. The hard part is deciding what counts as "billable" and what counts as "available," because those two choices can move your number by 10 points or more.
This guide shows the formula, the decisions behind each input, a worked example with real-year hours, how to roll individual rates into a team figure, and what to do with the result. It is written for owners and managers who bill for time, or who want to know how much of their payroll turns into revenue.
TL;DR
- Utilization rate = (billable hours ÷ available hours) × 100. A common target for mostly billable roles is roughly 70% to 85%, and 100% is a warning sign, not a goal.
- Available hours are standard working hours minus approved time off, holidays and similar paid non-working time. Write down your basis and keep it the same every period.
- Calculate each person first, then average those rates for the team figure.
- Use approved, tracked time. Estimated or reconstructed hours make the number unreliable.
- Use the rate with margin, pricing and hiring decisions, not on its own.
Table of Contents
- The utilization rate formula
- Which hours count as billable?
- Which hours count as available?
- How to calculate utilization rate step by step
- How to calculate team utilization
- Consultant utilization rate: what is different?
- What is a good utilization rate?
- Direct labor utilization and budget utilization
- Common mistakes that skew the number
- Our perspective: use utilization to price and plan, not to police
- Get utilization into your financial reporting
- FAQ
- Sources
The utilization rate formula
Utilization rate is the share of a person's working time that goes to billable work. Some firms call it chargeability. The formula, as NetSuite states it, is total billable hours divided by total available hours, multiplied by 100.
Utilization rate = (Billable hours ÷ Available hours) × 100
Two inputs, two questions:
- Billable hours: how many hours were spent on client work you can invoice?
- Available hours: how many hours could that person reasonably have worked in the same period?
Keep the period identical for both. A week of billable hours divided by a month of available hours gives you nonsense.
Which hours count as billable?
Billable hours are time spent on client projects that can be invoiced, per NetSuite's definition. That covers delivery work: preparing a client's reports, running a project, meeting with the client on their engagement.
The gray areas are where definitions drift:
- Internal meetings, training and documentation. These are non-billable, but they are still productive. TimeTac notes that productive hours include both billable work and internal work such as coordination, training and documentation.
- Sales and proposals. Usually non-billable. Count them consistently.
- Write-offs. If you do the work but cannot invoice it, decide up front whether it counts. Most firms count only time that is actually billed or billable under the contract.
This leads to two versions of the metric. Hubstaff distinguishes billable utilization, which looks only at client-chargeable time, from resource utilization, which includes billable and internal tracked time. Pick one as your headline number and label it.
Which hours count as available?
Available hours are standard working hours for the period minus approved time off, including holidays, PTO and sick leave, according to this time-tracking guide. The same guide advises adjusting for approved leave so employees are not penalized for taking time off.
For a U.S. full-time employee, ClickTime suggests starting with 2,080 annual hours (40 hours × 52 weeks), then subtracting company holidays, PTO, sick time and other paid non-working time.
There is no single correct denominator. Everhour explains that it can be gross capacity, net working hours after PTO and holidays, or total logged hours, and that each answers a different management question. So label it:
| Denominator | What it tells you |
|---|---|
| Gross capacity (2,080 hours) | How much of total paid capacity turns into billable work |
| Net available hours (after leave) | How well people use the time they are actually at work |
| Total logged hours | What share of tracked time is billable |
Paid leave is also a company decision. Everhour points out that U.S. private employers' vacation and holiday policies are generally policy inputs, not federal entitlements, and that the FLSA does not require payment for time not worked. Your own policy therefore sets your denominator.
How to calculate utilization rate step by step
The sequence below follows the approach TimeTac lays out: define the window, set available hours, track tasks, calculate individuals, then the team.
- Define the time window. A month works for most teams. Use a quarter or a year to smooth out seasonality.
- Set each person's available hours. Start from standard hours, then subtract approved leave and planned training.
- Capture billable hours. Use approved, tracked time. Toolscase cautions against estimated or reconstructed hours.
- Divide and multiply. Billable hours ÷ available hours × 100.
- Roll up to the team (see below).
- Compare to the target for that role, and to last period.
A worked example
Using ClickTime's U.S. example:
- Annual hours: 2,080
- After holidays, PTO and sick leave: 1,880 available hours
- Billable hours logged: 1,410
1,410 ÷ 1,880 = 0.75, so the utilization rate is 75%.
Now compare it with the gross version: 1,410 ÷ 2,080 = 67.8%. Same person, same year, two honest numbers. This is why the basis must be stated on every report.
A monthly example for a small firm
Say a three-person consulting team has these results in a month of 160 available hours each:
| Person | Billable hours | Utilization |
|---|---|---|
| Consultant A | 128 | 80% |
| Consultant B | 112 | 70% |
| Manager C | 64 | 40% |
Manager C looks low, but the role includes hiring, reviews and sales. That is why targets must be set by role, not company-wide.
How to calculate team utilization
For a team, Asana says to add individual utilization rates and divide by the number of team members. Projectworks describes the same idea for company-wide utilization.
From the table above: (80% + 70% + 40%) ÷ 3 = 63.3%.
This simple average treats everyone equally. If hours differ a lot (part-timers, for instance), compute the team rate as total billable hours ÷ total available hours instead: 304 ÷ 480 = 63.3% here, and the two methods agree because everyone has equal hours. When they do not, use the hour-weighted version and say so.
Consultant utilization rate: what is different?
A consultant's rate uses the same formula. Projectworks compares an individual's billable hours with their resourced hours, meaning the hours they were scheduled to work. Three points matter for consulting and professional services firms:
- Utilization sets your pricing floor. Wall Street Prep notes that capacity utilization is used in the optimal billing rate formula, alongside labor costs, overhead and profit margin. If your team is only 60% billable, each billable hour has to cover the cost of the other 40%.
- Individual vs. company view. The same source says individual utilization can flag underperformance, while capacity utilization matters for pricing and hiring.
- Senior people are billable less. Partners and managers carry sales and management duties. Set lower targets for them and higher targets for delivery staff.
If you want to see how utilization connects to profit, our guide to KPIs that predict profit for professional services shows where it sits among the other numbers worth watching.
What is a good utilization rate?
There is no universal answer. TimeTac recommends reviewing utilization against desired profit margins and each role's expected workload. Some reference points:
- One time-tracking guide says many services teams aim for roughly 70% to 85% for primarily billable roles, and treats 100% as a burnout signal.
- The American Institute of Architects cites a general benchmark of 60% to 65% of total labor dollars for utilization in design firms, and says necessary indirect labor such as administration, professional development and leave means rates can be optimized but not maximized to 100%.
Treat these as starting points. Your own margin math is the real test: set the target that, at your billing rates, covers salaries, overhead and the profit you want.
When a high rate is a problem
Utilization measures time allocation, not output or quality, as NetSuite points out. A person at 95% may be rushing, with no time for training, process improvement or recovery. The number can also be gamed: if a business stops recording non-billable time, the rate drifts toward 100%, as Wikipedia's entry on utilization rate notes. Protect honest tracking, or the metric is worthless.
When a low rate is a problem
A low rate can mean too few clients, too much unbilled scope, slow delivery, or too many people for the work. NetSuite says utilization data helps surface staffing imbalances, capacity gaps and opportunities to improve billing efficiency. Check the cause before cutting headcount. Our headcount planning model walks through how to test hiring against forecast demand.
If you also invest in programs meant to reduce burnout and protect capacity, measure them the same way you measure billable time, for example with a corporate wellness ROI method.
Direct labor utilization and budget utilization
Readers often search for related calculations that use the word "utilization" differently.
Direct labor utilization looks at payroll dollars rather than hours. According to a small-business accounting explainer, you divide the payroll that pays for direct labor (work tied to income-generating projects) by total payroll for the period. If $2,000 of a $3,000 payroll is direct labor, the result is 66.7%. The same page says most companies sit around 65%, and that more paid training and time off lowers the figure. That lines up with the AIA's 60% to 65% benchmark above.
Budget utilization is a different idea: the share of an allocated budget that has been spent. Divide spending to date by the budget and multiply by 100. It tells you about spending pace, not people's time.
All of these are ratios of "used" to "available." Define both sides clearly before comparing figures between companies or periods.
Common mistakes that skew the number
- Mixing denominators. Reporting gross capacity one month and net hours the next.
- Counting unapproved time. Reconstructed timesheets overstate billable hours.
- One target for every role. A partner and a staff accountant should not share the same goal.
- Ignoring leave. Without adjusting for approved time off, people who take vacation look underused.
- Using the rate alone. A 90% rate on underpriced work still loses money. Look at realization (billed versus billable value) and margin together.
Our perspective: use utilization to price and plan, not to police
We work with owners who bill for time and owners who do not, and the pattern is the same: utilization becomes useful when it is tied to dollars. We start with three questions. What does an hour of your team's time cost, fully loaded? What share of those hours do clients pay for? And what rate would you have to charge to hit your target margin at that share?
The answers often show that a firm's problem is pricing or scope control, not effort. A team at 78% utilization on fixed-fee work that keeps growing is quietly losing margin. A team at 62% with strong rates and healthy cash flow may be exactly where it should be. So we review utilization next to margin, cash flow and the pipeline, and we set targets by role.
We also push back on chasing 100%. The time people spend on training, process improvement and internal documentation is what keeps delivery quality up. If you want help turning this metric into a budget or a headcount plan, that is the kind of work we do as a fractional CFO team.
— Angelica
Get utilization into your financial reporting
The formula is easy. Getting clean, approved time data tied to your books, payroll and billing is the harder part. At AmCFO we provide bookkeeping, QuickBooks setup and cleanup, payroll support, budgeting, forecasting and fractional CFO services, so utilization, margin and cash flow can be read from one set of reliable numbers. If you suspect your labor costs and billable hours are not lining up, our efficiency and cost analysis is a good place to start.
If overhead is the bigger drag, see our breakdown of the top levers for cutting overhead, or talk to us through the consulting page about a modular engagement that fits your size without the cost of a full-time executive.
FAQ
What is the formula for utilization rate?
Utilization rate equals billable hours divided by available hours, multiplied by 100. For example, 120 billable hours out of 160 available hours is 75%. Always state whether your available hours are gross capacity or net of leave.
How do I calculate utilization rate for a team?
Calculate each person's rate, add them up and divide by the number of people. If team members work different hours, divide total billable hours by total available hours instead. Report which method you used.
What is a good consultant utilization rate?
Many services teams target roughly 70% to 85% for mostly billable roles, and managers or partners are usually set lower because of sales and management duties. Test the target against your billing rates and margin goals rather than copying a benchmark.
Should vacation and holidays count as available hours?
Usually not. Most firms subtract approved leave and holidays so people are not penalized for time off. Some report a gross-capacity version too. Both are valid if labeled consistently.
Can utilization rate be 100%?
It can on paper, but it is not a healthy goal. Real work includes training, administration and recovery. A reading near 100% often means non-billable time is not being recorded, or that people are overloaded.
Sources
- What Is Utilization Rate and How Do I Calculate It? (NetSuite)
- Utilization rate formula (Everhour)
- Utilization Rate: Formula, Examples and Targets (TimeTac)
- Employee utilization rate calculator (ClickTime)
- How to Calculate Utilization Rate (Toolscase)
- Utilization Rate: Formula, Benchmarks & How to Improve (Asana)
- How to Calculate Your Consulting Firm's Utilization Rate (Projectworks)
- Utilization Rate | Formula + Calculator (Wall Street Prep)
- Utilization Rate: Formula, Benchmarks & How to Calculate It (Hubstaff)
- AIA Best Practices: Budgeting key performance indicators
- Utilization rate (Wikipedia)
- What Is the Direct Labor Utilization? (Chron)