Time Duration Calculator
Calculate the duration between two times or add up multiple durations.
What is Duration?
A duration calculator with two modes: the span between a start and end clock time, or the total of several time-length entries.
How it works
Times are converted to minutes past midnight; overnight spans add 24 hours when the end is earlier than the start. Durations sum in normalized units.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Shift length
A shift from 09:15 to 17:30 works out to 8 hours and 15 minutes — subtract the lunch break separately for a net figure.
Common mistakes
Crossing midnight
A shift from 22:00 to 06:00 spans midnight. The calculator treats end times earlier than start times as next-day automatically.
Frequently asked questions
Can I add several intervals together?
Yes — stack multiple start/end pairs to total a week of time-sheet entries, with hours and minutes summarized.
Does it handle seconds?
Yes, times can include seconds and the result is broken into hours, minutes, and seconds.
Is the result exact?
Yes — durations are computed in the smallest unit you enter and never rounded in between, so totals are exact.