Free · Time and date calculators ⏳

Minute Duration Converter & Ten-Value Sum

Convert a duration through minutes, seconds, hours and fixed longer units, or add the first two through ten duration values.

  • Formula & worked example
  • Private in your browser
  • No signup
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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

90 minutes equals 1.5 hours or 5,400 seconds. In addition mode, 1:30:00 plus 2:15:00 plus 0:45:00 totals 4:30:00.

1 minute = 60 seconds; 1 hour = 60 minutes; selected sum = entries 1 through N

Worked example

Enter these known values and leave the other values blank.

Minutes
90 min
Hours / minutes / seconds
1:30:0 hrs / min / sec
Seconds
5400 sec
Hours
1.5 hrs
Days
0.0625 days
Weeks
0.008929 wks
Fixed-length month equivalent
0.0020534 mos
Fixed-length year equivalent
0.0001711 yrs
More units
5400000 ms

Assumptions and limitations

  • Conversion mode represents one elapsed duration in several units. Addition mode uses the first N entries, where N is the selected count from two through ten.
  • Unlike the twenty-entry total tools, reducing N selects a shorter sum. Higher entries are retained for later use but are hidden and excluded from the displayed total.
  • Months and years are fixed-duration unit equivalents from the captured model, not calendar intervals. They do not account for differing month lengths, leap dates or time zones.
  • Use hours:minutes:seconds in compound fields. A leading minus sign applies to the whole duration. Signed durations and zero totals are supported.

Common questions

Why are later entries excluded when I reduce the count?

Each selected total covers exactly the first N entries. Raising the count again restores the retained later entries to the displayed total.

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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