Convert units of measurement instantly. Transform length, weight, volume, and temperature between metric and imperial units.
A unit converter transforms measurements from one unit to another within the same category (length, weight, volume, temperature). With different measurement systems used worldwide (metric vs. imperial), unit conversion is essential for international communication, scientific calculations, cooking, construction, and everyday tasks. A unit converter eliminates manual calculation errors and provides instant, accurate conversions.
Our free Unit Converter supports four major categories: length (meters, kilometers, inches, feet, miles, etc.), weight (kilograms, grams, pounds, ounces, etc.), volume (liters, gallons, cups, fluid ounces, etc.), and temperature (Celsius, Fahrenheit, Kelvin). Simply select a category, choose your source and target units, enter a value, and get instant conversion results with high precision.
Unit conversion is necessary because different countries and industries use different measurement systems. The metric system (meters, kilograms, liters) is used in most of the world, while the imperial system (feet, pounds, gallons) is still common in the United States. Converting between these systems manually is error-prone and time-consuming. A unit converter ensures accuracy and saves time.
Unit converters are essential for international trade, scientific research, cooking recipes, construction projects, travel planning, and educational purposes. They help bridge the gap between different measurement systems and ensure accurate communication across borders and industries.
Convert between metric and imperial length units:
Common conversions: 1 meter = 3.28084 feet, 1 kilometer = 0.621371 miles, 1 inch = 2.54 centimeters.
Convert between metric and imperial weight units:
Common conversions: 1 kilogram = 2.20462 pounds, 1 pound = 16 ounces, 1 ton = 1000 kilograms.
Convert between metric and imperial volume units:
Common conversions: 1 liter = 0.264172 gallons, 1 gallon = 3.78541 liters, 1 cup = 236.588 milliliters.
Convert between temperature scales:
Conversion formulas: °F = (°C × 9/5) + 32, K = °C + 273.15
Unit conversion uses conversion factors that relate different units:
For example, converting 10 feet to meters: 10 feet × (1 meter / 3.28084 feet) = 3.048 meters.
Temperature conversions use formulas rather than simple multiplication because different temperature scales have different zero points and scale intervals.
The metric system (International System of Units, SI) is based on powers of 10, making conversions straightforward. It's used by most countries worldwide and is the standard in science and international trade.
The imperial system (used primarily in the United States) uses historical units like feet, pounds, and gallons. Conversions between imperial units are less systematic than metric conversions.
Our unit converter:
Yes, our converter uses standard conversion factors from international measurement standards. Results are accurate for general use.
US gallon = 3.78541 liters, UK gallon = 4.54609 liters. Our converter uses US gallons. Be aware of this difference for international applications.
Results are shown with up to 6 decimal places. For most practical purposes, this provides sufficient precision.
No, conversions are only within the same category (length to length, weight to weight, etc.). Cross-category conversions require additional context.
Temperature scales have different zero points and intervals, so they require formulas rather than simple multiplication. Celsius and Fahrenheit are relative scales, while Kelvin is absolute.