Free unit converter for length, weight, volume, and area. Instantly convert between metric and imperial units with accurate results.
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Whether you're cooking with a recipe from another country, working on an international project, or solving homework problems, our unit converter handles all your conversion needs. Switch between metric and imperial units effortlessly with precise results.
Unit conversion is the process of changing a measurement from one unit to another while maintaining the same quantity. The world uses different measurement systems—metric (meters, kilograms, liters) predominates globally, while the US primarily uses imperial (feet, pounds, gallons). Understanding conversions is essential for international communication, science, cooking, travel, and countless everyday situations.
Conversion Principle
New Value = Original Value × Conversion FactorConvert length, weight, volume, temperature, and more in one convenient tool.
Get accurate conversions using exact conversion factors, not rounded approximations.
From everyday miles-to-kilometers to specialized units, we've got you covered.
Convert cups to milliliters, ounces to grams, and Fahrenheit to Celsius for international recipes.
Convert miles to kilometers, gallons to liters, and understand local measurement systems.
Switch between pounds and kilograms, miles and kilometers for workout logging.
Complete physics, chemistry, and engineering assignments requiring unit conversions.
The metric system was developed during the French Revolution for universal standardization. Most countries adopted it, but the US, Liberia, and Myanmar still primarily use imperial/customary units. This historical divide persists due to the cost and complexity of switching established systems.