Unit Converters

Length, area, weight, temperature, data storage, percentage and number-to-words converters.

• Length ConverterInches, feet, miles, cm, meters, km and more
• Area ConverterSquare feet, acres, square meters, hectares
• Weight ConverterPounds, ounces, stone, tons, kg and grams
• Temperature ConverterFahrenheit, Celsius, Kelvin and Rankine
• Data Storage ConverterBits, bytes, KB, MB, GB, TB (1000 vs 1024)
• Number to Words ConverterWrite amounts in words for checks and contracts
• Percentage CalculatorX% of Y, percent of a total, percent change
• Pressure Converterpsi, kPa, bar, atm, mmHg, inHg and more
• Power ConverterWatts, kW, hp, BTU/h and tons of cooling
• Energy ConverterJoules, kWh, BTU, therms, calories and eV
• Speed Convertermph, km/h, m/s, ft/s, knots, Mach and pace
• Angle ConverterDegrees, radians, gradians, DMS and turns
• Volume ConverterGallons, quarts, cups, fl oz, liters, cu ft
• Shoe Size ConverterUS, UK, EU, CM/JP and kids shoe sizes
• Roman Numeral ConverterArabic to Roman numerals and back, 1 to 3999
• Time Unit ConverterMilliseconds, seconds, hours, days, months, years
• Ring Size ConverterUS, UK, EU and Japan ring sizes from mm