Convert between length, weight, volume, temperature, area, and speed units instantly with precise calculations.
Quick Answer:1 mile = 1.60934 km, 1 pound = 0.453592 kg, 1 gallon = 3.78541 liters, 1 inch = 2.54 cm. Select a category and units below for any conversion.
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When converting units, always convert to a base unit first (meters for length, grams for weight, etc.) and then to the target unit. This two-step approach avoids compounding rounding errors that can occur with direct conversion factors. For temperature, remember that conversions involve both scaling and offset adjustments, making them non-linear unlike other unit categories.
To convert between metric and imperial units, multiply your value by the appropriate conversion factor. For example, to convert inches to centimeters, multiply by 2.54. To convert pounds to kilograms, multiply by 0.453592. Our unit converter handles all these calculations automatically across length, weight, volume, temperature, area, and speed categories.
US and Imperial fluid measurements differ slightly. A US fluid ounce is approximately 29.5735 ml, while an Imperial fluid ounce is about 28.4131 ml. Similarly, a US gallon is 3,785.41 ml while an Imperial gallon is 4,546.09 ml. This converter uses US customary measurements by default.
Temperature conversions use specific formulas rather than simple multiplication. To convert Celsius to Fahrenheit: F = C x 9/5 + 32. To convert Fahrenheit to Celsius: C = (F - 32) x 5/9. To convert Celsius to Kelvin: K = C + 273.15. These formulas account for the different zero points and scale sizes of each temperature system.