What it means
The measure only makes sense once you define two things: which hours count as billable, and what counts as available. Available hours normally start from contracted hours and then subtract holiday, public holidays and expected sick leave, leaving a realistic denominator rather than a theoretical one.
It matters because in a service business, the utilisation rate is the direct link between headcount and revenue. Every percentage point represents chargeable hours that either turned into an invoice or did not, and a firm can be busy, profitable-looking and still quietly under-recovering.
Firms usually set different targets by grade. Junior delivery staff might be targeted at 80% to 85%, senior managers at 60% because they also sell work and supervise, and partners lower still, so a single company-wide target is normally a mistake.
Utilisation should be read next to the realisation rate, which is the share of billed hours actually collected in cash. A consultant at 90% utilisation whose time is repeatedly written off in negotiation is worse for the business than one at 75% whose hours are all recovered.
Pushing the rate too high has real costs. Sustained utilisation above roughly 90% leaves no room for training, business development or absence cover, and it is one of the most reliable predictors of burnout and resignation in professional services.
The rate is also the main input into hiring decisions. When a team runs consistently above target for several months, the choice is to recruit, subcontract or turn work away, and firms that ignore the signal usually end up delivering late and discounting fees to keep clients calm.
In practice
Real-world examples.
Example
A digital agency finds designers at 82% and account managers at 48%. Rather than pushing account managers harder, it reclassifies a portion of their client-facing planning time as billable under new contract terms.
Example
A law firm reviews a solicitor running at 94% for six consecutive months. The managing partner reduces her caseload deliberately, having seen the same pattern precede two previous resignations.
Example
An engineering consultancy discovers that non-billable time is dominated by rebuilding the same proposal documents. Building a reusable proposal library lifts average utilisation across the team by roughly four percentage points without anyone working longer hours.
Think of it
“Utilization rate shows how much of employee time is productive-working versus available hours.
Formula
Calculation
Utilisation Rate = (Billable hours / Available hours) x 100.
A consultant works a 40-hour week. Out of 52 weeks, she takes five weeks of annual leave and there is one week of public holidays, leaving 46 working weeks, so available hours are 46 x 40 = 1,840 for the year.
She records 1,380 billable hours. Her utilisation rate is 1,380 / 1,840 = 0.75, or 75%. At a charge-out rate of $180 per hour, those billable hours represent 1,380 x $180 = $248,400 of gross fee income before any write-offs. Raising her to an 80% target would mean 1,840 x 0.80 = 1,472 billable hours, an extra 92 hours worth roughly 92 x $180 = $16,560.Case study
Seen in the real world.
Marlow Grey Advisory is a fictional consultancy created for this illustrative case. It set a single firm-wide target of 85% and reported an average of 78%, which leadership read as a straightforward performance shortfall to be pushed harder.
Splitting the figure by grade told a different story. Analysts were at 88%, well above target, while senior managers sat at 55% because they were spending most of their week writing proposals and running recruitment. The single target had been simultaneously overworking one group and unfairly marking down another.
Marlow Grey replaced it with grade-specific targets of 85% for analysts, 75% for managers and 55% for senior managers, and began reporting utilisation alongside realisation. Within three quarters, fee income per head had improved, analyst attrition had fallen, and the firm had a far clearer view of which grades actually generated its margin.
Watch out
Common mistakes.
- Using total contracted hours as the denominator without deducting holiday and expected absence, which produces a rate that no one could ever achieve.
- Applying one target across every grade, which penalises senior staff whose job includes selling work and developing the team.
- Reading utilisation on its own without realisation, so hours that were billed but later written off still look like a success.
Questions
People also ask.
Is 100% the goal?
No, because it leaves no capacity for training, business development, holiday cover or the inevitable overruns, and it reliably precedes burnout and resignations.
Does the measure apply outside professional services?
A version of it does: manufacturers track productive machine and operator time, and support teams track time on tickets, though the ratio is then about capacity rather than billing.
How often should it be reviewed?
Monthly by individual and grade, with a rolling twelve-month view for resourcing and hiring decisions, since single weeks are far too volatile to act on.
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