What it means
In a consultancy, agency, law firm or repair business, the main thing for sale is hours. An hour that is paid for but not sold, such as time spent waiting for work, in training or on internal meetings, still costs the same as a billable one.
Utilisation shows how much of that paid capacity is turning into revenue. The measure compares a numerator, usually billable or productive hours, with a denominator, which can be total paid hours or available hours after holidays and leave.
Firms differ on the choice, so a quoted utilisation rate is only meaningful when you know which denominator sits behind it. A rate based on paid hours will always be lower than one based on hours available after leave.
Higher is not always better. A target of 100% is unrealistic because people need time for training, sales support, administration and rest, and pushing too hard leads to burnout, errors and staff turnover.
Most firms set different targets by seniority, with junior staff expected to bill a larger share of their time than partners and managers, who spend more of theirs on selling and supervising. Utilisation links directly to profit.
Each staff member has a fixed cost, so a rise in billable hours increases revenue with little extra cost. A fall in utilisation of a few percentage points across a large team can wipe out a meaningful part of the profit.
Managers also look at the realisation rate, which compares the amount actually billed with the value of the hours at standard rates. A team can be busy and still earn less than expected if time is discounted or written off before invoicing.
Utilisation and realisation together show whether capacity is being filled and whether it is being paid for.
In practice
Real-world examples
Example 1
An advertising agency with 40 creatives finds that average utilisation is 62%, against a target of 72%. The managing director realises that the gap equals about 4 staff members' worth of unsold capacity. She introduces weekly resource planning to match staff to client work earlier.
Example 2
A car repair garage measures the time mechanics spend with a vehicle on a job, compared with their clocked hours. It discovers that a lot of time is lost looking for parts and waiting for approvals. The owner reorganises the stockroom and cuts the lost time by a quarter.
Example 3
An accounting practice sets utilisation targets of 85% for juniors, 70% for managers and 30% for partners. Partners are expected to spend the rest of their time on winning work and developing the team. The targets are reviewed quarterly against actual results.
Think of it
Think of labor utilization like a car engine. The car has a maximum speed, but running it at maximum redline capacity all the time will burn it out. You need cruising speed, routine maintenance stops, and fuel to keep going safely.
Formula
Calculation
Labour utilisation rate = Billable hours / Available hours x 100%
A consultant has 160 working hours available in a month after public holidays and leave. She records 120 billable hours on client projects, with the remaining 40 spent on training, internal meetings and proposals. Her utilisation is 120 / 160 = 75%. At a billing rate of $150 per hour, her month generated 120 x 150 = $18,000 of revenue, and each extra 8 billable hours would add 8 x 150 = $1,200.Case study
Seen in the real world
Greywood Engineering Consultants is an illustrative, fictional firm of 30 engineers. The managing partner could not understand why revenue was growing while profit was falling. Staff were busy, and clients were happy, but the numbers did not add up.
A review of time sheets showed that average utilisation had slipped from 78% to 68% over two years as more time went on unbilled project overruns and proposal writing. At an average rate of $140 per hour, those 10 percentage points, across 30 engineers each available for about 2,080 hours a year, represented roughly $870,000 of annual capacity at that rate. The firm introduced fixed-fee scoping reviews and a proposal budget, and utilisation recovered to 74% within a year.
Watch out
Common mistakes
- Comparing utilisation rates between firms without checking whether they use paid hours or available hours as the denominator.
- Setting a target near 100%, which ignores the training, sales and admin time that every team needs and leads to burnout.
- Looking at utilisation without realisation, so busy teams that discount or write off time look more profitable than they are.
Questions
People also ask
What is a good labour utilisation rate?
It depends on the industry and the role, but 70% to 85% is a common range for billable staff in professional services, with lower targets for managers and partners.
Is labour utilisation the same as labour productivity?
No, utilisation measures how much time is spent on productive work, whereas productivity measures how much output is achieved per hour.
Does the measure apply outside services?
Yes, factories use the same idea to compare productive running time with available time for both people and machines.