Convert units instantly for length, weight, temperature, volume, speed, time, and more. Free online unit converter for metric, imperial, US, and SI units.
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
What is a unit converter?
A unit converter converts measurements between different unit systems, including metric, imperial, and US customary units.
Which units can I convert?
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.
How do I use the unit converter?
Enter a value, choose the unit you are converting from, and then choose the unit you want to convert to. The result updates instantly.
Can I use this as a metric and imperial unit converter?
Yes. This page is designed for fast metric-to-imperial, imperial-to-metric, US customary, and SI unit conversions across common measurement categories.
Can I convert metric to imperial units?
Yes. This converter supports common metric-to-imperial conversions such as cm to inches, kg to lbs, km to miles, and Celsius to Fahrenheit.
What are the most common unit conversions?
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.
Is this converter suitable for technical calculations?
Yes. It can be used for everyday conversions as well as study, travel, fitness, shopping, science, and engineering tasks.
Are US customary and imperial units the same?
Not always. Some units have the same name but different values. For example, a US gallon and an imperial gallon are different sizes.
Why should I use a dedicated converter category?
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.
