How are decimal hours calculated?

The total minutes are divided by 60 and rounded to two decimals. For example, 1:30 equals 1.50 decimal hours.

What happens if the subtraction is negative?

Negative results are shown with a minus sign in both H:MM and decimal hours, so 0:30 minus 1:00 displays as -0:30.

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Time Calculator

Add or subtract hours and minutes.

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How to use the Time Calculator

1Pick Add or Subtract mode.
2Enter hours and minutes for both durations.
3Read the result as H:MM, total minutes, and decimal hours.

About the Time Calculator

Free time calculator to add or subtract hours and minutes. Get the result in H:MM, total minutes, and decimal hours instantly, with negative results handled.

Part of our Calculators collection. Browse all tools.

Frequently asked questions

How are decimal hours calculated?: The total minutes are divided by 60 and rounded to two decimals. For example, 1:30 equals 1.50 decimal hours.
What happens if the subtraction is negative?: Negative results are shown with a minus sign in both H:MM and decimal hours, so 0:30 minus 1:00 displays as -0:30.