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Time Duration Calculator

Adds and subtracts times and durations, and converts between hours, minutes and seconds.

Calculators Nothing uploaded No sign-up Free, unlimited
Calculators tool
Enter your figures and press Calculate.
In short Time Duration Calculator is a free online tool on inputtesthub.com that adds and subtracts times and durations, and converts between hours, minutes and seconds. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Time Duration Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Time Duration Calculator

The Time Duration Calculator adds and subtracts times and durations, and converts between hours, minutes and seconds. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Working out hours on a timesheet.
  • Calculating a shift length minus breaks.
  • Adding up several session durations.

Frequently asked questions

Is the Time Duration Calculator free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Time Duration Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
When would I actually need the Time Duration Calculator?
The jobs it is built for: working out hours on a timesheet. Calculating a shift length minus breaks. Adding up several session durations. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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