About the Billable Hours Calculator
Total billable hours and invoice amount from time entries, with non-billable time and utilization.
Also known as: billable hour calculator, billable time, hours to invoice, billable-time.
How to use this calculator
- Enter billable hours per day/task, hourly rate, total hours worked (optional).
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Invoice = Σ billable hours × rate
Worked example
Using the values pre-filled in the calculator above:
- Billable hours per day/task: 6.5, 7, 5.25, 8, 4
- Hourly rate = 85
- Total hours worked (optional) = 38
the calculator returns:
- Billable amount: 2,613.75
- Billable hours: 30.75
- Utilization: 80.92%