What it means
In a professional services business, time is the main product. A consultant is paid for every working hour, but only the hours spent on client work can be invoiced.
Billable utilisation shows what share of available hours turns into revenue. Time that is not billable includes training, internal meetings, business development, administration, holidays and waiting between projects.
Some of it is essential, and a firm that pushes utilisation to 100% will burn out its people and neglect sales and learning. Each firm therefore sets target ranges by role, with juniors typically expected to be higher than managers and partners.
The measure drives profit directly. Salaries and overheads are largely fixed, so each additional billable hour carries a high margin.
A few percentage points across a large team can be worth tens or hundreds of thousands of dollars a year. Leaders look at utilisation together with the billing rate and the realisation rate, which is the share of billable time actually collected from clients.
A person can be busy and yet unprofitable if hours are discounted, written off or poorly priced. For that reason, a good dashboard shows utilisation, rate and realisation side by side.
Definitions vary, so it is important to be clear. Some firms measure against a standard 40-hour week, others against available hours after holidays and leave, and some include only time that is billed rather than time that is billable.
A team comparing its numbers with others should confirm that the same definition is used. Managers can improve utilisation by looking at where time goes rather than by pushing people harder.
Common fixes include better project scoping, quicker handovers between projects, templates for repeat work and sensible limits on unbilled internal tasks. Tracking time weekly, not monthly, makes the problems visible while they can still be fixed.
In practice
Real-world examples
Example 1
An accounting firm sets a utilisation target of 80% for its associates and 50% for its managers. At the end of the quarter, the average associate sits at 72%. The managing partner reviews the workload and finds that two clients were consuming time that was not being invoiced. She renegotiates the scope with both clients and puts extra work under a change order.
Example 2
A marketing agency has 20 staff who each have 1,800 available hours a year. The agency reaches a utilisation of 60%, producing 21,600 billable hours. By pitching for new work in quiet periods, it lifts utilisation to 66%, adding 2,160 billable hours.
Example 3
An IT consultancy sees utilisation fall to 45% after a major project ends. The resource manager redeploys three engineers to a new account and moves two onto training. Utilisation recovers to 62% over the next two months. The resource manager now reviews upcoming project end dates every fortnight to avoid another gap.
Think of it
Think of a restaurant kitchen. The chefs spend time cooking meals that customers pay for, but they also spend time cleaning stations, prepping ingredients, and attending team briefs. Billable utilisation is the percentage of time spent cooking meals customers actually buy.
Formula
Calculation
Billable utilisation = Billable hours / Available hours x 100
Revenue from utilisation = Billable hours x Billing rate
A consultant has 2,000 available working hours in a year after holidays and leave. She records 1,300 billable hours, so utilisation = 1,300 / 2,000 x 100 = 65%. At a billing rate of $150 per hour, her billable revenue = 1,300 x 150 = $195,000. If utilisation rose by 5 percentage points to 70%, billable hours would be 2,000 x 0.70 = 1,400, which adds 100 hours and 100 x 150 = $15,000 of revenue.Case study
Seen in the real world
Bluebird Advisory is a fictional consultancy with 30 consultants and annual revenue of $4,500,000. The managing director noticed that profit margins were slipping even though staff looked busy. A review showed billable utilisation of 58%, well below the target of 70%.
In this illustrative scenario, the firm found that consultants spent a lot of time on unbilled proposal writing and internal reporting. It introduced templates, a weekly resource meeting and a rule that unbilled project work needed approval. Within a year utilisation rose to 67%, which added about 4,860 billable hours across the team (9% x 1,800 hours x 30 staff). At an average rate of $140 an hour, that is roughly $680,000 of extra revenue.
Watch out
Common mistakes
- Aiming for 100% utilisation. People need time for training, sales and rest, and pushing too far leads to burnout and quality problems.
- Looking at utilisation without realisation. Hours that are discounted or written off do not turn into cash.
- Comparing figures that use different definitions. Always check whether the denominator is total hours or available hours.
Questions
People also ask
What is a good utilisation rate?
It varies by role and sector, but many firms target roughly 60% to 80% for client-facing staff, with lower targets for senior people.
How is utilisation different from productivity?
Utilisation measures how much time is billable, while productivity also considers the value produced in that time.
Can utilisation be improved without working longer hours?
Yes, by reducing administrative time, improving resource planning and winning more of the right work, so that the same hours produce more fees.