How do I convert a duration?

Enter a number of seconds in the input field. The tool instantly shows the equivalent in HH:MM:SS, a day/hour/minute/second breakdown, a verbose English description, and total milliseconds.

Does it support decimal seconds?

Yes. If you enter a decimal value (e.g. 3661.5), the fractional part is converted to milliseconds and included in the total milliseconds row. The HH:MM:SS display uses whole seconds.

Is the duration converter free?

Yes, completely free. All conversions run entirely in your browser — no data is sent to any server, and no signup is required.

Duration Converter

Convert seconds to hours, minutes, and seconds (HH:MM:SS) instantly online. Shows breakdown, verbose text, and total milliseconds. Free duration converter — no signup required.

Duration in Seconds

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How to Use the Duration Converter

Enter a number of seconds in the input field (decimals are supported).
The tool instantly shows four formats: HH:MM:SS, a compact breakdown, a verbose description, and total milliseconds.
Click Copy next to any row to copy that value individually.
Use Load Example to see how 3661 seconds (1 hour, 1 minute, 1 second) is displayed.

Common Uses

Formatting audio/video lengths from raw second values
Converting API timestamps or elapsed times to readable form
Converting performance benchmark durations
Displaying countdown or elapsed time in user interfaces