Explore our complete collection of free online unit converters. Choose a category below to quickly convert measurements, units, currencies, and other everyday values. Unit Conversion Pro provides fast, accurate, and easy-to-use conversion tools for common conversion needs.
Length & Distance
Convert between common units of length and distance, including inches, centimeters, feet, meters, yards, miles, kilometers, and more.
Popular Length & Distance Converters
- Inches to Centimeters Converter
- Centimeters to Inches Converter
- Feet to Meters Converter
- Meters to Feet Converter
- Miles to Kilometers Converter
- Kilometers to Miles Converter
- Miles to Feet Converter
- Yards to Meters Converter
- Millimeters to Inches Converter
View All Length & Distance Converters →
Weight & Mass
Convert between common units of weight and mass, including pounds, kilograms, ounces, grams, stones, tons, milligrams, and more.
Popular Weight & Mass Converters
- Pounds to Kilograms Converter
- Kilograms to Pounds Converter
- Ounces to Grams Converter
- Grams to Ounces Converter
View All Weight & Mass Converters
Temperature
Convert between Fahrenheit, Celsius, Kelvin, and other temperature scales.
Popular Temperature Converters
View All Temperature Converters
Volume & Capacity
Convert gallons, liters, milliliters, cups, pints, quarts, fluid ounces, tablespoons, teaspoons, and more.
Popular Volume & Capacity Converters
- Gallons to liters Converter
- Liters to Gallons Converter
- Milliliters to Cups Converter
- Cups to Milliliters Converters
- Fluid Ounces to Milliliters Converter
- Milliliters to Fluid Ounces Converter
- Teaspoons to Milliliters Converter
- Tablespoons to Milliliters Converter
View Volume & Capacity Converters
Currency & Exchange Rates
Convert between major world currencies using current exchange rates, including U.S. dollars, euros, British pounds, Japanese yen, Canadian dollars, and more.
Popular Currency & Exchange Rate Converters
View All Currency & Exchange Rates Converters
Area
Convert square feet, square meters, acres, hectares, square miles, square kilometers, and other area measurements.
Popular Area Converters
- Square Feet to Square Meters Converter
- Square Meters to Square Feet Converter
- Acres to Square Feet Converter
- Square Miles to Square Kilometers Converter
- Acres to Hectares Converter
Speed
Convert miles per hour, kilometers per hour, meters per second, knots, and other speed measurements.
Popular Speed Converters
Time
Convert seconds, minutes, hours, days, weeks, months, years, and other units of time.
Popular Time Converters
Data & Digital Storage
Convert bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and other digital storage units.
Popular Data & Digital Storage Converters
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Energy
Convert joules, kilojoules, calories, kilocalories, kilowatt-hours, BTUs, and other energy units.
Popular Energy Converters
Pressure
Convert PSI, bar, pascals, kilopascals, atmospheres, and other pressure units.
Popular Pressure Converters
Power
Convert watts, kilowatts, horsepower, and other units of power.
Popular Power Converters
Fuel Economy
Convert miles per gallon, kilometers per liter, liters per 100 kilometers, and other fuel-economy measurements.
Popular Fuel Economy Converters
View All Fuel Economy Converters
Cooking & Kitchen
Convert cups, tablespoons, teaspoons, fluid ounces, milliliters, grams, ounces, and other common cooking measurements.
Popular Cooking & Kitchen Converters
View All Cooking & Kitchen Converters
Angle
Convert degrees, radians, and other angular measurements.
Popular Angle Converters
Find the Unit Converters You Need
Unit Conversion Pro is designed to make everyday conversions fast and simple. Browse the categories above to find the unit converters you need, from common measurement conversions to currency, digital storage, cooking, energy, and more. New conversion tools will be added as our converter library continues to grow.
Measurement standards help ensure conversions are consistent and accurate. Learn more about measurement units and the International System of Units (SI) from the U.S. National Institute of Standards and Technology (NIST).