Inventory & operations

Billable Hours Calculator

Convert a work session into decimal billable hours and an invoice amount after breaks and non-billable time.

Free, no sign-upRuns in your browserFormula & methodology
24-hour
24-hour
minutes
per hour

Results update as you type. Your numbers stay in this browser.

Billable hoursExample7 hourshours
Invoice before tax
$420.00
Elapsed session
8.5 hours

Understand the result

How to calculate billable hours

Billable hours = (elapsed minutes − breaks − non-billable minutes) ÷ 60; invoice = hours × rate

One session shorter than 24 hours. An end time earlier than the start means the next day. Equal times mean zero hours. No billing increments, overtime or tax are applied.

Worked example

An illustrative scenario. “Reset to example” restores it in the calculator.

Session start
09:00
Session end
17:30
Breaks and non-billable time
90 minutes
Billing rate
$60 per hour

Billable hours: 7 hours

Common questions

Billable Hours FAQ

Is 1 hour 30 minutes entered as 1.30 hours?

No. It is 1.5 decimal hours. This calculator converts clock times to decimal hours before multiplying by the hourly rate.