Utilization rate tells you what percentage of available work time goes toward billable client work. The formula is simple: divide billable hours by total available hours, then multiply by 100. If someone works 40 hours in a week and bills 30 of those to clients, their utilization rate is 75%.

The tricky part is defining “available hours” and “billable hours” consistently. Available hours typically means standard work hours minus PTO, holidays, and company meetings. Billable hours means time directly chargeable to clients based on your engagement agreements. Time spent on proposals, internal projects, training, and admin work counts as non-billable.

Target utilization rates vary by role and industry. Professional services firms like consulting practices and marketing agencies often aim for 65% to 80% for client-facing staff. Law firms may push higher. Leadership and business development roles naturally run lower because their job involves non-billable activities like sales and strategy.

Aiming for 100% utilization sounds good in theory but creates problems. People need time for professional development, internal collaboration, and administrative tasks. Pushing utilization too high leads to burnout and corner-cutting. Most healthy firms accept that some percentage of time will always be non-billable and plan their pricing accordingly.

Track utilization at the individual level and the team level. Individual tracking helps identify capacity issues and workload imbalances. One person at 95% while another sits at 40% signals a distribution problem. Team-level averages show overall operational efficiency and help with hiring decisions.

The real value comes from connecting utilization to profitability. High utilization with low realization (actual collected revenue versus potential revenue) means you’re busy but not making money. Maybe you’re writing off time, discounting invoices, or working on fixed-fee projects that take longer than estimated. A small business bookkeeper who understands service businesses can help you see these connections in your financials.

Review utilization monthly at minimum. Weekly is better for spotting trends before they become problems. If you bill clients, this number directly affects your revenue capacity. Knowing your team’s utilization helps you forecast revenue, decide when to hire, and price projects more accurately.