Conversion Tools

11 free calculators in this category — no sign-up required.

Convert any number of hours into minutes instantly.…

Convert minutes into hours (and leftover minutes) instantly.…

Convert minutes into seconds instantly.…

Convert seconds into minutes (and leftover seconds) instantly.…

Convert hours directly into total seconds.…

Convert days into total hours.…

Convert weeks into total days.…

Convert days directly into total minutes.…

Convert any clock time between 12-hour and 24-hour format in either direction.…

Convert a standard 12-hour AM/PM time into 24-hour military format.…

Convert a 24-hour military time into standard 12-hour AM/PM format.…

Related picks

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Multi-Function Digital Watch

Switch between 12-hour and 24-hour display on the wrist.

Handy for getting used to reading 24-hour/military time day to day.

Scientific Calculator

A dedicated calculator for quick manual conversions and checks.

Useful for double-checking conversions when you're offline.