12 Hour to 24 Hour Converter
Convert a standard 12-hour AM/PM time into 24-hour military format.
12 Hour to 24 Hour Converter
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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.
View on AmazonScientific Calculator
A dedicated calculator for quick manual conversions and checks.
Useful for double-checking conversions when you're offline.
View on AmazonHow the 12 Hour to 24 Hour Converter works
- Enter the time you want to convert.
- Select the conversion direction if it isn't detected automatically.
- Read both the 12-hour and 24-hour equivalents in the result.
Formula / logic
24-hour to 12-hour: subtract 12 from any hour after 12 and label it PM (00:00 becomes 12:00 AM). 12-hour to 24-hour: add 12 to any PM hour except 12 PM.
Worked example
14:00 in 24-hour time is 2:00 PM. Conversely, 9:00 PM becomes 21:00 in 24-hour (military) time.
Frequently asked questions
How do I convert 8 PM to 24-hour time?
Add 12 to any PM hour except 12 PM itself: 8 PM becomes 20:00.
Why is midnight written as 00:00?
24-hour time starts each day at 00:00 rather than 12:00, avoiding the AM/PM ambiguity around midnight and noon.
Is military time the same everywhere?
The 24-hour clock format is the same worldwide, though it's more commonly used outside the US for everyday civilian purposes.
Is the 12 Hour to 24 Hour Converter free to use?
Yes — every calculator on this site is free, with no sign-up or download required.
Does the 12 Hour to 24 Hour Converter work on mobile?
Yes, the layout and calculator both adapt to phone and tablet screens.