Free · Everyday calculations

Duration in Decimal Hours, Minutes & Seconds

Express the same entered duration as decimal hours, total minutes and total seconds, with optional component-by-component working.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

One hour, 30 minutes and 36 seconds equals 1.51 hours, 90.6 minutes or 5,436 seconds.

H = h + m/60 + s/3600; total minutes = 60H; total seconds = 3600H

Worked example

Enter these known values and leave the other values blank.

Hours (hh)
1
Minutes (mm)
30
Seconds (ss)
36
Show the calculation
Show working
Total decimal hours
1.51 hrs
Total decimal minutes
90.6 min
Total seconds
5436 sec

Assumptions and limitations

  • This is an elapsed-duration conversion, with fixed units of 60 seconds per minute and 60 minutes per hour. It has no timezone, calendar or daylight-saving behavior.
  • All components must be nonnegative. Values such as 90 minutes are allowed and contribute 1.5 hours.
  • Outputs are three representations of the same duration; do not add them together. The retained solver calculates totals from components.

Common questions

Can I enter decimal minutes?

Yes. For example, 0.5 minutes contributes 30 seconds. Enter any other seconds component separately to avoid counting it twice.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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