Date & Time Tools
Time Duration Calculator
Calculate the duration between two times or add up multiple durations.
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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
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.