Transparent calculations
How do you calculate billable utilization?
Start with the scheduled working hours for the people and period you are measuring. Subtract leave and holidays to get available hours. Divide actual billable hours by available hours, then multiply by 100. Keep ordinary non-billable work in the denominator so meetings, training and business development remain visible.
Utilization (%) = billable hours ÷ available hours × 100
Target billable hours = available hours × target (%) ÷ 100
For a team, add the hours first and then calculate the ratio. Do not average individual percentages when people have different available hours. If you include overtime, include it consistently in scheduled availability; this tool asks you to correct any billable total above the available hours.
A worked agency example
Illustrative monthly inputs: 160 scheduled hours, 16 hours of leave, 100 billable hours and a chosen 75% target. Available hours are 144. Utilization is 100 ÷ 144 × 100 = 69.44%. The target requires 108 billable hours, leaving an 8-hour gap.
The remaining 44 available hours are not automatically waste. They may include project administration, training, internal meetings or available time without client work. Review the underlying time records before deciding what to change.
What does the result tell you?
Compare like-for-like periods and roles before interpreting a change. A lower rate may reflect planned training, account management or a quiet sales period. A high rate does not prove healthy margins: pricing, rework, write-offs and unpaid invoices still matter. Your target should fit the role and operating model; this calculator does not prescribe a universal benchmark.
Use the agency capacity planner to check the other side of the decision. Then review agency profit-margin definitions and evidence and agency pricing observations without treating them as a guaranteed result for your business.
From calculation to client work
Keep the hours close
to the project.
Workspace369 connects client records, projects, tasks and invoices. Time tracking and billable time come with every plan. Use those records to review actual work against the scenario you planned here.
This free tool is a standalone planning model. It does not connect to your workspace or claim that the app automatically calculates this exact report.
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Common questions
Should I subtract meetings from available hours?
In this calculator, no. Only leave and holidays reduce the denominator. Meetings, training and other internal work remain part of available hours. State this definition when comparing your result with a report or another tool, because utilization denominators can differ.
Is 75% a good billable utilization target?
The 75% default is an editable example, not an industry recommendation. Targets depend on role, internal responsibilities, demand and your business model. Compare consistent periods and check quality, workload and margins alongside utilization.
Does billable utilization measure paid invoices?
No. Billable hours describe work classified as chargeable, while invoices and payments describe billing and collection. A high utilization rate can coexist with write-offs, unpaid invoices or weak profit margins.
Method and sources
Created by the Workspace369 editorial team. Method reviewed October 10, 2026. These are transparent calculations on your inputs, not survey findings or measured industry averages. Sources explain the concepts; our examples and implementation are original.
- Productive: employee utilization and available hours — supports the billable-hours / available-hours definition. We do not reproduce its benchmark or revenue-growth claims.
- Teamwork: using the workload planner — distinguishes availability, assigned effort and capacity.
Found a problem with a formula? Contact Workspace369 with the inputs and expected result, excluding personal or client information.