Multiply or divide time calculator
Handy for a task repeated several times, or for splitting available time between people or tasks.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter duration (h:mm or h:mm:ss), operation and number.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
The duration is turned into seconds, multiplied or divided by the number, then turned back into hours:minutes:seconds.
Example
Inputs: Duration (H:MM or H:MM:SS) = 1:45, Operation = Multiply ×, Number = 12. Result: Result: 21:00; Decimal hours: 21 h; In minutes: 1,260 min.
Limits and caveats
- The H:MM:SS result is rounded to the nearest second; the decimal hours and minutes are exact.
Questions about this tool
How long do 12 sessions of 1:45 take?
1:45 × 12 = exactly 21 hours.
How do I split 8 hours between 3 people?
Choose divide and enter 3; each person gets 2:40, two hours 40 minutes.
Can the number be a decimal?
Yes. Multiplying by 2.5, for example, gives 0:25 × 2.5 = 1:02:30.