Unit Converter
Convert length, mass, temperature, volume, area, and speed between metric and imperial units — with the exact conversion factor or formula shown for every result.
Category
base unit: meter
Result
0.393701 in
1 cm = 0.393701 in
Common length conversions
| From | To |
|---|---|
| 1 in | 2.54 cm |
| 1 ft | 0.3048 m |
| 1 yd | 0.9144 m |
| 1 mi | 1.60934 km |
| 1 m | 3.28084 ft |
| 100 km | 62.1371 mi |
Frequently Asked Questions
- How does the unit converter work?
- Pick a category, enter a value, and choose the units to convert from and to. Every unit is defined by its exact ratio to a base unit (meters, kilograms, liters, square meters, or meters per second), so the result is computed precisely and the conversion factor is shown alongside it.
- Why is temperature converted differently?
- Celsius, Fahrenheit, and Kelvin scales have different zero points, so a simple multiplication factor cannot convert between them. The tool uses the standard formulas instead — for example °F = °C × 9/5 + 32 — and displays the formula it applied.
- Are these US or imperial (UK) measures?
- Volume units (cups, pints, quarts, gallons) use US customary definitions, which differ from UK imperial measures — a US gallon is about 3.785 liters while a UK gallon is about 4.546 liters. Length, mass, area, and speed units are identical in both systems.
- How precise are the results?
- Results are rounded to 6 significant digits for display. The underlying conversion factors are exact where an exact definition exists (an inch is exactly 2.54 cm, a pound is exactly 0.45359237 kg) so accuracy is limited only by display rounding.
- Does the converter work offline?
- Yes. All conversions run entirely in your browser with no server round trip, so once the page has loaded the converter keeps working without an internet connection.