What is billable utilization?

Billable utilization is the percentage of available working hours that a person or team spends on billable client work. It is also called the agency utilization rate. Formula: billable utilization = billable hours / available hours x 100 Example: a designer has 40 available hours in a week and logs 30 hours on client work. Billable utilization is 30 / 40 = 75%. If the same designer logs 24 billable hours, it is 60%. Be clear about which measure you report. Billable utilization counts only hours clients pay for. Total utilization also counts productive non-billable work, such as internal projects or sales support. Label them separately so a 90% "utilization" that includes internal work is not mistaken for 90% billable time. For a team, divide the sum of billable hours by the sum of available hours. Do not average individual percentages: a part-timer at 90% and a full-timer at 60% do not average to 75% of the team's capacity. Benchmarks: SPI Research's 2026 Professional Services Maturity Benchmark reports average billable utilization of 66.4% in 2025 across 509 professional services firms, below the 70% it treats as a healthy minimum. In its 2025 edition (2024 data), high-performing firms averaged 76.2% against 66.3% for the rest, and SPI described 75% as the optimal level. These are mostly technology and consulting firms, not marketing agencies, so treat them as context. Targets differ by role. Designers, developers and writers usually carry most of the billable load; account managers, project managers and owners run lower because much of their time is coordination, sales and management. Why it matters: utilization and billing rate are the two biggest drivers of agency margin. For example, a 10-person team with 2,000 available hours each, billing $100 an hour, gains $200,000 a year in billable revenue for every 10 points of utilization (10 x 2,000 x 10% x $100). How to improve it: • Scope projects tightly so revisions and overruns do not eat unbilled time • Plan capacity so people are not waiting between projects • Make time tracking quick, with timers and daily entries, so billable work is actually recorded • Cut internal meetings and admin that do not need to happen Common mistakes: leaving vacation and holidays out of available hours, which inflates the rate; setting one target for every role; and pushing utilization so high that there is no time for training, sales or unexpected client requests. Limits: utilization measures how much time is billed, not whether that time is profitable. A team at 85% on underpriced work can earn less than a team at 65% on well-priced work, so read it next to effective hourly rate and project margin. To measure it you need time entries split into billable and non-billable work. In AgencyPro, time tracking and capacity management are on the Pro plan; team performance and profitability reports are on Plus. For planning hours against demand, see the capacity planning guide linked below.