Worldwide

Unit converters

Free, exact unit converters for length, weight, volume, area, speed, data and more. Every conversion uses internationally defined factors.

Every converter on this page uses the international definition of its units, so a mile is exactly 1.609344 kilometres and a pound is exactly 0.45359237 kilograms, the values fixed by the international yard and pound agreement rather than rounded folk figures. Each conversion page explains the factor it applies, shows the arithmetic step by step, and gives reference points so you can sanity-check a result. Temperature pages handle the offset scales (Celsius, Fahrenheit, Kelvin) where multiplying alone is not enough. Results carry enough decimal places for cooking, travel, DIY and homework; for engineering or anything safety-critical, verify against the source document your work is governed by.

Length & distance

Centimeters to Inches Inches to Centimeters Centimeters to Feet Feet to Centimeters Feet to Meters Meters to Feet Millimeters to Inches Inches to Millimeters Feet to Inches Inches to Feet Kilometers to Miles Miles to Kilometers Meters to Yards Yards to Meters Miles to Feet Nautical Miles to Kilometers

Weight & mass

Kilograms to Pounds Pounds to Kilograms Grams to Ounces Ounces to Grams Grams to Pounds Pounds to Grams Stone to Pounds Pounds to Stone Kilograms to Stone Stone to Kilograms Milligrams to Grams Ounces to Pounds

Volume & capacity

Liters to US Gallons US Gallons to Liters Milliliters to US Fluid Ounces US Fluid Ounces to Milliliters Liters to US Fluid Ounces Imperial Gallons to Liters Liters to Imperial Gallons

Temperature

Celsius to Fahrenheit Fahrenheit to Celsius Celsius to Kelvin Kelvin to Celsius Fahrenheit to Kelvin Kelvin to Fahrenheit

Area

Square Feet to Square Meters Square Meters to Square Feet Acres to Square Feet Square Feet to Acres Hectares to Acres Acres to Hectares Square Meters to Square Yards

Speed

Miles Per Hour to Kilometers Per Hour Kilometers Per Hour to Miles Per Hour Knots to Miles Per Hour Knots to Kilometers Per Hour Meters Per Second to Kilometers Per Hour Miles Per Hour to Meters Per Second

Data

Megabytes to Gigabytes Gigabytes to Megabytes Gigabytes to Terabytes Kilobytes to Megabytes

Power

Mechanical Horsepower to Kilowatts Kilowatts to Mechanical Horsepower Watts to Kilowatts

Pressure

Bar to Pounds Per Square Inch Pounds Per Square Inch to Bar Kilopascals to Pounds Per Square Inch