Measurement calculator
Metric and Imperial Measurement Converter
Enter a measurement the way people actually write it and see the useful metric and imperial equivalents.
What the result means
The same length is shown in several forms. This matters because 2.5 feet is not 2 feet 5 inches. Half a foot is 6 inches.
Exact conversion
One inch equals exactly 25.4 millimeters. Fractional inch results are rounded to a practical denominator for display.
Common mistakes
- Reading decimal feet as feet and inches.
- Rounding the metric value before converting it back.
- Leaving the unit off and assuming the calculator guessed correctly.
Before you use the result
This calculator performs the math using the information you enter. Check the measurements and make sure the result fits the actual project before cutting, drilling, buying materials, or putting anything into service.