Unit Converter

A unit converter is a practical tool that converts measurements from one unit to another across different measurement systems. Units of measurement vary around the world — the metric system (meters, kilograms, Celsius) is used in most countries, while the imperial system (feet, pounds, Fahrenheit) is common in the United States. This converter bridges the gap between these systems instantly.

Our free online unit converter supports three major categories: Length (millimeters, centimeters, meters, kilometers, inches, feet, yards, miles), Weight (milligrams, grams, kilograms, ounces, pounds), and Temperature (Celsius, Fahrenheit, Kelvin). Each conversion uses precise mathematical factors to ensure accuracy.

Unit conversion is needed in everyday life for cooking (cups to milliliters), travel (miles to kilometers), fitness (pounds to kilograms), science (Celsius to Kelvin), construction (feet to meters), and many other activities. This tool eliminates the need to remember complex conversion formulas and provides instant, accurate results.

All conversions are computed locally in your browser using standard mathematical relationships. No data is sent to any server, and the tool works instantly even without an internet connection after the page loads.

1. Select a category — Choose Length, Weight, or Temperature depending on what you need to convert.
2. Enter a value — Type the number you want to convert in the Value field.
3. Select the source unit — Choose the unit you are converting from using the dropdown menu.
4. Select the target unit — Choose the unit you want to convert to from the dropdown on the right panel.
5. View the result — The converted value appears instantly as you type, along with the full conversion expression.
6. Swap units — Click the Swap Units button to quickly reverse the conversion direction.

Conversions use a base-unit approach. Each unit defines how to convert to and from a base unit (meters for length, grams for weight, Celsius for temperature):

Length (base: meter): 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 yard = 0.9144 m, 1 mile = 1609.344 m, 1 km = 1000 m, 1 cm = 0.01 m, 1 mm = 0.001 m.

Weight (base: gram): 1 kg = 1000 g, 1 mg = 0.001 g, 1 oz = 28.3495 g, 1 lb = 453.592 g.

Temperature: F to C: (F - 32) x 5/9. C to F: C x 9/5 + 32. K to C: K - 273.15. C to K: C + 273.15.

To convert between any two units, the value is first converted to the base unit, then from the base unit to the target unit.