Utilization Rate: How to Calculate It (and What's Good)

Payroll is the biggest line on almost every services P&L. Utilization rate is the number that tells you what that payroll is producing. Yet plenty of firms that can quote their revenue to the dollar have never once computed it.

The formula takes thirty seconds. The judgment calls around it — what counts as capacity, what counts as billable, and what a fair target is — are where teams go wrong. This post covers all three, plus a calculator to see what your current rate is costing you.

The formula, without the fog

Utilization rate = billable hours ÷ capacity hours.

Both halves need an honest definition:

1. Set a realistic capacity basis. Not 40 hours — nobody bills 40. After standing meetings, admin, and internal work, most people have 32 to 36 sellable hours in a week. Pick one basis and use it for everyone, consistently.
2. Count hours booked to clients. Committed client work only. Internal projects and "almost billable" time don't count — that's the discipline covered in billable hours: what counts, what leaks.
3. Divide, and compare to your target. The rate by itself is trivia. The rate versus your target is a decision: below target means sell, at target means healthy, over means relief — hire, subcontract, or say no.

Billable versus productive utilization

Two versions of this metric exist, and mixing them up flatters everyone:

Both are worth watching. But when the question is "should we hire?" or "can we take this client?", billable utilization is the one that decides. A team that's 95 percent productive but 55 percent billable doesn't need another seat. It needs more sold work.

What's a good utilization rate?

Most services firms set the target around 75 percent of realistic capacity. For context, a 2025 NetSuite benchmark put average billable utilization at 66.4 percent — meaning the typical firm runs meaningfully below the common target. Three bands cover the practical readings:

• Below about 70 percent: you have a bench. That's not a moral failing — it's inventory. Sell it before you add to it.
• Roughly 70 to 85 percent: healthy. Room for select new work; start planning the next hire before you need it.
• Sustained 90 percent or more: the team is running hot. Expect quality slips and burnout if it holds — hire, subcontract, raise rates, or turn work away.

What does your current rate cost?

Utilization becomes real when you attach payroll to it. Try your own numbers — this is arithmetic on your inputs, an estimate, not a measured claim:

With the defaults — one person, $80,000 loaded cost, billing 24 of 40 hours against an 80 percent target — the estimate lands at 60 percent utilization and about $16,000 a year of paid-for capacity going unsold. That's the illustrative version of the point: the gap between your rate and your target is a dollar figure, and it compounds by headcount.

Per person beats the average

One caution before you act on a team-level number: averages hide the story. A "74 percent" team can be two people underwater and two people idle. The fix is the same math, run per person, then rebalanced — that's resource allocation. And if the average is fine but profit still isn't, the hours may be billable at rates that don't hold up — the Margin Leak Auditor ($79) works that side of the problem.

Once you know your rate, the next question is usually the expensive one: does this number say hire, or does it say sell? That's the whole subject of should I hire? Run the capacity math first.