Unit & Measurement Converters
Convert length, weight, volume, area, speed, temperature and other common measurements.
About these tools
Conversion tools translate a value from one measurement unit into another using defined conversion factors. The collection includes everyday metric and imperial conversions as well as practical area, volume, speed and measurement utilities.
Most unit conversions are exact or use established constants. Display rounding can make the visible result shorter than the internal value, so use the precision shown by the individual converter when the calculation requires close tolerances.
Browse Converters
CM to Inches
Convert centimeters to inches instantly.
Open tool →Inches to CM Converter
Convert inches to centimeters instantly.
Open tool →MM to Inches
Convert millimeters to inches instantly with the exact 25.4 mm per inch relationship.
Open tool →Inches to MM
Convert inches to millimeters instantly using exactly 25.4 millimeters per inch.
Open tool →Inches to Feet
Convert inches to feet instantly using 12 inches per foot.
Open tool →KM to Miles
Convert kilometers to miles instantly using the exact international conversion relationship.
Open tool →Miles to KM
Convert miles to kilometers instantly using the exact international mile definition.
Open tool →Meters to Feet
Convert meters to feet instantly using the exact international foot definition.
Open tool →Feet to Meters
Convert feet to meters instantly using exactly 0.3048 meters per foot.
Open tool →Grams to Ounces
Convert grams to avoirdupois ounces instantly using the exact ounce definition.
Open tool →Ounces to Grams
Convert avoirdupois ounces to grams instantly using the exact ounce definition.
Open tool →Liters to Gallons
Convert liters or litres to US and Imperial gallons with selectable gallon type.
Open tool →Gallons to Liters
Convert US or Imperial gallons to liters with a selectable gallon system.
Open tool →MM to CM
Convert millimeters to centimeters instantly using the exact metric relationship.
Open tool →CM to MM
Convert centimeters to millimeters instantly using the exact metric relationship.
Open tool →MPH to KPH
Convert miles per hour to kilometers per hour instantly.
Open tool →KPH to MPH
Convert kilometers per hour to miles per hour instantly.
Open tool →Meters to Yards
Convert meters or metres to yards instantly using the exact international yard definition.
Open tool →Yards to Meters
Convert yards to meters or metres instantly using the exact international yard definition.
Open tool →mL to Cups
Convert milliliters to US customary, US legal, metric or Imperial cups.
Open tool →Cups to mL
Convert US customary, US legal, metric or Imperial cups to milliliters.
Open tool →mL to Oz
Convert milliliters to US or Imperial fluid ounces with clearly labeled volume systems.
Open tool →Oz to mL
Convert US or Imperial fluid ounces to milliliters with the correct fluid-ounce standard.
Open tool →Acres to Square Feet
Convert acres to square feet instantly for land, property, farming and lot-size calculations.
Open tool →Square Feet to Acres
Convert square feet to acres instantly for property, lots, farms and land planning.
Open tool →Square Meters to Square Feet
Convert square meters or square metres to square feet for homes, rooms, offices and floor plans.
Open tool →Square Feet to Square Meters
Convert square feet to square meters or square metres for property, rooms and floor plans.
Open tool →KG to LBS
Convert kilograms to pounds instantly.
Open tool →LBS to KG Converter
Convert pounds to kilograms instantly.
Open tool →Celsius to Fahrenheit Converter
Convert Celsius temperatures to Fahrenheit.
Open tool →Fahrenheit to Celsius Converter
Convert Fahrenheit temperatures to Celsius.
Open tool →Binary Converter
Convert binary, decimal, hexadecimal and octal integers instantly.
Open tool →Hex Converter
Convert hexadecimal, decimal, binary and octal integers instantly.
Open tool →Unit Converter
Convert length, weight, temperature, area, volume, speed and common metric and imperial units.
Open tool →MP4 to MP3 Converter
Convert a local MP4 video file to MP3 directly in your browser.
Open tool →Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
Open tool →Number to Words Converter
Convert whole numbers into written English words.
Open tool →How calculations and results are handled
Converters use documented unit relationships and apply the appropriate multiplication or division factor. They do not estimate physical measurements that were not entered.
Each individual tool page explains its own inputs, result and important limitations where additional context is useful.