Unit Converter
Convert between the most common units used in the US and worldwide.
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What is this tool?
The Unit Converter lets you quickly convert between the most commonly used units of measurement — including length (miles, kilometers, feet, meters), weight (pounds, kilograms, ounces), temperature (Fahrenheit, Celsius, Kelvin), speed, area, and volume. It's especially useful for Americans converting to or from the metric system.
How to use
- Select a category from the dropdown (Length, Weight, Temperature, etc.).
- Choose the unit you are converting from in the left dropdown.
- Choose the unit you are converting to in the right dropdown.
- Enter your value — the result updates instantly.
- Click ⇄ to swap the from and to units.
Frequently Asked Questions
Is this tool free?
Yes, it is 100% free with no sign-up required.
How many miles is a kilometer?
1 kilometer equals approximately 0.6214 miles. So 5 km is about 3.1 miles.
How do I convert Fahrenheit to Celsius?
Select the Temperature category, choose Fahrenheit as the "from" unit and Celsius as the "to" unit, then enter your temperature. The formula is (°F − 32) × 5/9 = °C.
How many pounds is a kilogram?
1 kilogram equals approximately 2.2046 pounds.