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Free online converters for units, currencies, and data formats. Fast, accurate, and always up to date.
11,752+ conversions available
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Core Units
Convert between kilometers, miles, feet, meters, inches, and more
72 conversionsConvert between kilograms, pounds, ounces, grams, and more
42 conversionsConvert between Celsius, Fahrenheit, Kelvin, and Rankine
12 conversionsConvert between mph, km/h, m/s, knots, and Mach
20 conversionsConvert between liters, gallons, milliliters, cups, and more
72 conversionsConvert between square feet, square meters, acres, hectares, and more
30 conversionsConvert between seconds, minutes, hours, days, weeks, and more
56 conversionsData & Technology
Convert between bytes, kilobytes, megabytes, gigabytes, and more
30 conversionsConvert between bps, Kbps, Mbps, and Gbps
12 conversionsConvert between HEX, RGB, HSL, and CMYK color formats
30 conversionsConvert between binary, octal, decimal, and hexadecimal
20 conversionsEncode and decode URL, HTML, Base64, and more
20 conversionsScience & Engineering
Convert between PSI, bar, atm, Pascal, and mmHg
30 conversionsConvert between joules, calories, kilowatt-hours, BTU, and more
42 conversionsConvert between watts, kilowatts, horsepower, and BTU/h
12 conversionsConvert between hertz, kilohertz, megahertz, and gigahertz
12 conversionsConvert between mpg, L/100km, and km/L
6 conversionsConvert between degrees, radians, gradians, and arc seconds
20 conversionsEveryday
Convert cooking measurements with ingredient-specific accuracy
480 conversionsConvert shoe sizes between US, UK, EU, and CM systems
30 conversionsConvert clothing sizes between US, UK, EU, and Asian systems
20 conversionsConvert times between world timezones
2352 conversions