Time calculator
Add or subtract hours, minutes and seconds easily.
Espacio publicitario
- Result
- 4h 15m 0s
- Total in minutes
- 255
Espacio publicitario
How hours, minutes and seconds are added or subtracted
Each duration is first converted to total seconds so it can be used in the calculation:
total seconds = hours × 3600 + minutes × 60 + seconds
The total seconds of both durations are then added or subtracted depending on the chosen operation, and the result is converted back into hours, minutes and seconds:
hours = ⌊seconds ÷ 3600⌋ · minutes = ⌊(seconds mod 3600) ÷ 60⌋ · seconds = seconds mod 60
If the result of a subtraction is negative, the absolute value is shown preceded by a minus sign.
Worked example
Adding 2h 30m 0s and 1h 45m 0s gives 14,400 seconds, equivalent to 4h 15m 0s, or 255 minutes in total.
Frequently asked questions
- How do I add hours, minutes and seconds?
- Each duration is converted into total seconds (hours × 3600 + minutes × 60 + seconds), the seconds of both durations are added, and the total is converted back into hours, minutes and seconds.
- Can I subtract a longer duration from a shorter one?
- Yes, if the result is negative the calculator shows it with a minus sign before the resulting hours, minutes and seconds.
- What is the 'total in minutes' shown in the result?
- It's the resulting duration expressed entirely in minutes (rounding down any leftover seconds), useful for comparing durations quickly.
- Can I use decimals in hours, minutes or seconds?
- The fields accept numbers, but for accuracy it's best to enter minutes and seconds as whole numbers within their usual range (0-59).
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