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Billing Hours Calculator

Total billable hours at an hourly rate with an optional tax or discount on the final amount.

Total billable hours

Billable hours: —
Subtotal: —
Adjustment: —
Total: —
The subtotal is the billable hours multiplied by the rate; tax is added while a discount is taken off.

How to use the Billing Hours Calculator

  1. Enter the billable hours and any extra minutes you worked.
  2. Set your hourly rate and choose the currency for the invoice.
  3. Pick tax or discount, type the percentage and read the final total.

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Frequently Asked Questions

Common questions about the free online billing hours calculator.

Enter the hours and the extra minutes you worked, set your hourly rate, and the subtotal is worked out as hours multiplied by the rate.
Minutes are converted to a fraction of an hour, so thirty minutes becomes zero point five of an hour in the subtotal.
Choose Add tax, enter the percentage and the tax amount is shown next to the subtotal before being added to the final total.
Choose Apply discount and the percentage is taken off the subtotal, which is useful for a goodwill reduction or a prepayment.
Yes. Pick a dollar, euro or pound symbol, or choose no symbol if you would rather show plain numbers on your invoice.
Every amount is rounded to two decimal places and thousands separators are added, so the figures are ready to copy.
Work out the standard hours here, then run the extra hours again with your overtime rate and add the two totals together.
No. Every figure is calculated in your browser and nothing is saved, uploaded or shared with anyone.
Yes. The calculator is responsive and the number fields are easy to use on a phone, a tablet and a desktop.

Last updated: October 10, 2026