Utilization Rate Calculator

What is utilisation rate and why does it matter?

Utilisation rate is the percentage of available working time that is spent on billable client work. It is the single most direct measure of how productively a professional services business converts its primary resource, time, into revenue. A business with high rates but low utilisation can earn less than a business with lower rates and high utilisation. Understanding and actively managing utilisation is therefore as important as managing pricing when it comes to revenue performance.

The formula is simple: divide billable hours by total available hours and multiply by 100. If you worked 120 billable hours out of 160 available hours in a month, your utilisation rate is 75 percent. The available hours figure should represent realistic working time, not a theoretical maximum. A professional working a standard 40-hour week for four weeks has 160 available hours, but accounting for public holidays and other commitments, the realistic available time may be closer to 150 hours. Using a realistic denominator produces a more accurate utilisation rate.

Revenue at current utilisation is the product of billable hours and your hourly rate. If you billed 120 hours at $85 per hour, your revenue for the period was $10,200. If you had achieved your 75 percent target utilisation on 160 available hours, you would have billed 120 hours and earned the same $10,200. But if your actual utilisation was only 65 percent, you billed 104 hours and earned $8,840, leaving $1,360 of potential revenue unrealised in that month alone. Over a year, a 10 percentage point utilisation gap at this rate represents more than $16,000 in unrealised revenue.

What is a good utilisation rate?

There is no universally correct utilisation rate, because the optimal rate depends on your business model, service type, and working style. Solo freelancers typically achieve 55 to 70 percent utilisation in practice, because they must personally handle all business development, administration, and non-client activities. Small agency teams often target 70 to 80 percent utilisation for delivery staff, with business development and management roles running lower. Large professional services firms may push senior delivery staff to 80 to 85 percent, though sustained rates above 85 percent are associated with burnout and quality problems.

The key insight is that a utilisation rate above 100 percent is mathematically impossible, but rates approaching 90 percent or above leave no capacity buffer for learning, relationship building, internal improvement, or recovery from over-delivery on demanding projects. Most sustainable businesses target a rate that allows good work quality and manageable workload, typically somewhere in the 65 to 80 percent range for delivery-focused roles.

Using target utilisation for capacity planning

If you know your target utilisation rate and your available hours, you can calculate the billable hours target for any period. This becomes the foundation of capacity planning. If you have a team of five consultants each with 160 available hours per month and a target utilisation of 72 percent, the team should deliver 576 billable hours monthly. If you have contracted client work requiring 700 hours, you are at 109 percent of capacity and need to hire, reduce scope, or extend timelines. Utilisation rate is therefore not just a historical metric but a forward-looking planning tool for resource allocation and hiring decisions.