12-Hour to 24-Hour Converter
Convert 12h to 24h quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.
Convert 12h to 24h using the conversion factor used by this tool.
How to use the 12-Hour to 24-Hour Converter
- Enter the number you want to convert.
- Confirm the source unit shown beside the input.
- Choose decimal precision if you need more or less detail.
- Read the converted result.
- Copy the result when you need to use it elsewhere.
How the conversion works
Convert 12h to 24h using the conversion factor used by this tool.
For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.
Common 12h to 24h conversions
| 12h | 24h |
|---|---|
| 1 12h | 1 24h |
| 2 12h | 2 24h |
| 5 12h | 5 24h |
| 10 12h | 10 24h |
| 20 12h | 20 24h |
| 50 12h | 50 24h |
Example
For example, entering 1 12h gives approximately 1 24h using the rule above. Change the input to test your own value.
Frequently asked questions
Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.
Page reviewed: August 24, 2026.