Billable Utilization Rate Calculator

See what share of your working hours you actually bill, and what unbilled time costs you.

Updated November 8, 2026. Runs in your browser; nothing you type is stored.

What is billable utilization?

Utilization is the share of your working time that you can charge a client for. If you work 45 hours in a week and bill 27 of them, your utilization is 60%. The other 18 hours went to emails, proposals, invoicing, marketing, learning and everything else that keeps a business running.

Agencies track this number closely because it drives profit. Freelancers benefit from tracking it too: it explains why a busy week did not turn into a big invoice, and it shows how much extra income is possible by trimming admin or delegating it.

The formula

Utilization % = billable hours ÷ total hours worked × 100
Revenue at target = total hours × target utilization × hourly rate
Yearly gap = (revenue at target − revenue now) × 48 working weeks

Worked example

You work 45 hours a week, bill 27 and charge $80 an hour. Your utilization is 27 ÷ 45 = 60% and you bill $2,160 a week. At a 70% target you would bill 31.5 hours, or $2,520 a week. Over 48 working weeks that gap is worth $17,280.

Ways to improve your utilization

• Batch admin into one or two fixed blocks a week instead of spreading it everywhere.
• Use templates for proposals, contracts and onboarding emails.
• Automate invoicing and payment reminders.
• Bill for what you can. Client calls, revisions and project management are often billable but forgotten.

Frequently asked questions