Time Duration
Add and subtract hours, minutes, and seconds.
Loading tool
Add a list of durations, or enter a start and end clock time. Crossing midnight is treated as the next day unless you say otherwise.
How to use this tool
- Set the dates or duration. Pick the clocks, dates, or timer length you need.
- Start or calculate. Run the timer or read the difference. Time zones use this browser.
- Copy the result. Copy timestamps or calendar values into your notes.
Formats
Accepts 1h 30m, 90m, and 1:30:00. Mixed rows in a list are converted to seconds, then summed.
Frequently asked
Can I sum a timesheet?
Paste one duration per line. The total is in hours and minutes.
Does it deduct a lunch break?
Add a negative duration or a break field.
Are seconds rounded?
You can round to the next minute for billing-style estimates.
Is this payroll?
No. It is duration math.
Can I convert to decimal hours?
Yes. 1:30 becomes 1.5.