How to Convert Units of Measurement
Unit conversion is essential in everyday life, science, cooking, and engineering. This guide explains the principles and provides practical examples.
The Conversion Factor Method
Every unit conversion uses a factor. To convert km to miles, multiply by 0.621371. To convert pounds to kg, multiply by 0.453592. Our unit converter handles all calculations automatically—just select your units and enter a value.
Metric vs Imperial
The metric system (meters, grams, liters) uses base-10 multiples: 1 km = 1000 m. The imperial system (feet, pounds, gallons) uses irregular ratios: 1 mile = 5280 feet. Converting between systems requires specific factors.
Temperature Conversion
Temperature conversion uses formulas, not simple factors. Celsius to Fahrenheit: °F = °C × 9/5 + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Kelvin = Celsius + 273.15.