Convert length, weight, temperature, volume, speed, time and more. Metric, imperial, US customary and SI unit conversions in one place.
Unit converter for fast and accurate conversions across metric, imperial, and US customary systems. Convert units instantly, including cm to inches, kg to lbs, Celsius to Fahrenheit, and km to miles.
Use this conversion tool for everyday and technical measurements:
- Length, mass, volume, area, speed, and time
- Temperature, pressure, power, energy, and torque
- Fuel consumption, density, data storage, acceleration, and angle
Select a category to open a dedicated converter with precise results for study, travel, fitness, engineering, and shopping.
Most Common Conversion Factors
| km/h | m/s | mph | kn | |
|---|---|---|---|---|
| 1 km/h | 1 | 0.277778 | 0.621371 | 0.539957 |
| 1 m/s | 3.6 | 1 | 2.23694 | 1.94384 |
| 1 mph | 1.60934 | 0.44704 | 1 | 0.868976 |
| 1 kn | 1.852 | 0.514444 | 1.15078 | 1 |
Unit Converter FAQ
A unit converter converts measurements between different unit systems, including metric, imperial, and US customary units.
You can convert common measurements such as length, mass, volume, area, speed, time, temperature, pressure, power, energy, torque, density, acceleration, angle, data storage, and more.
Enter a value, choose the unit you are converting from, and then choose the unit you want to convert to. The result updates instantly.
Yes. This page is designed for fast metric-to-imperial, imperial-to-metric, US customary, and SI unit conversions across common measurement categories.
Yes. This converter supports common metric-to-imperial conversions such as cm to inches, kg to lbs, km to miles, and Celsius to Fahrenheit.
Popular conversions include cm to inches, meters to feet, kg to lbs, liters to gallons, km to miles, mph to km/h, and Celsius to Fahrenheit.
Yes. It can be used for everyday conversions as well as study, travel, fitness, shopping, science, and engineering tasks.
Not always. Some units have the same name but different values. For example, a US gallon and an imperial gallon are different sizes.
Dedicated converter categories, such as acceleration, pressure, energy, or density, make it easier to choose the correct units and get precise results for a specific measurement type.
