Free Online Unit Converter

Convert between hundreds of units across 10 categories: length, weight, temperature, volume, area, speed, time, digital storage, energy, and pressure. All conversions happen instantly in your browser — no server requests, no sign-up required.

Popular Conversions

• Kilometers to Miles — multiply by 0.621371
• Pounds to Kilograms — multiply by 0.453592
• Fahrenheit to Celsius — subtract 32, then multiply by 5/9
• Gallons to Liters — multiply by 3.78541
• Feet to Meters — multiply by 0.3048
• Acres to Hectares — multiply by 0.404686
• PSI to Bar — multiply by 0.0689476