Tools / Time calculator (add hours & minutes)
Time calculator: add hours & minutes
Enter durations in h:mm (or decimal hours), one per line. Put a minus in front to subtract. The total is shown in h:mm, decimal hours and minutes.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Enter one duration per line.
- Use a minus sign to subtract (e.g. -0:30 break).
- Read the total in h:mm and decimal hours.
Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How do I convert minutes to decimal hours?
Divide by 60: 45 minutes = 0.75 hours, so 7:45 = 7.75 h.
How do I add times?
Add hours and minutes separately and carry 60 minutes into one hour: 7:45 + 3:30 = 11:15.
Can I enter seconds?
Yes, as h:mm:ss.