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Adding Hours Calculator

hours
hours

Result

Total Hours15.00 h
Hours and Minutes15h 00m
↗ Everyday Life

Adding Hours Calculator The Adding Hours Calculator totals two durations measured in hours and shows the result both as a decimal number of hours and in hours-and-minutes format. It is handy for adding up work shifts, study sessions, or billable time. — free online calculator.

Formula

Total hours = first duration + second duration; total minutes = rounded(total hours × 60) for h:mm.
  • Adding Hours Calculator calculates its result from First duration (hours), Second duration (hours). It uses the formula Total Hours = First Duration + Second Duration. Change any input to recalculate the result instantly.
  • The main inputs are First duration, Second duration. Enter them in the units and format shown in the calculator.
  • Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Adding Hours

Inputs
  • First duration: 5 hours
  • Second duration: 10 hours

5.00 + 10.00 hours = 15.00 hours = 15h 00m.

Sample result: Calculating…

Frequently asked questions

What does the Adding Hours calculate?

Adding Hours Calculator The Adding Hours Calculator totals two durations measured in hours and shows the result both as a decimal number of hours and in hours-and-minutes format. It is handy for adding up work shifts, study sessions, or billable time. — free online calculator.

Which values should I enter?

Enter First duration, Second duration using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Total hours = first duration + second duration; total minutes = rounded(total hours × 60) for h:mm..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 10, 2026