Add, subtract, multiply and divide time expressed in days, hours, minutes and seconds.
This calculator performs arithmetic on time durations. Add and subtract combine two durations and return the d:h:m:s result. Multiply and divide scale a single duration by a numeric factor — for example, doubling a 2h30m shift gives 5h00m. All operations work internally in seconds for precision, then convert back to the familiar d:h:m:s format for display.
Addition / Subtraction
Result (s) = Duration A (s) ± Duration B (s)
Multiply / Divide
Result (s) = Duration A (s) × factor
Any of: d:h:m:s (e.g. 1:02:30:00), h:m:s (e.g. 02:30:00), or m:s (e.g. 90:00). Days are optional — omit them when the duration is under 24 hours.
Yes. If you subtract a larger duration from a smaller one, the result is negative and is displayed with a leading minus sign.
The entire duration is scaled by the factor. For example, multiplying 1h30m by 2 gives 3h00m. Fractional factors like 1.5 are supported.
The 'Result' shows the duration in d:h:m:s format where hours resets to 0 each day. 'Total Hours' converts the entire duration to a decimal hour count.