Best Free Unit Converters
Free, accurate unit converters for length, weight, temperature, speed, data and more.
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Length Converter
Convert meters, feet, miles, kilometers & more.
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Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
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Weight Converter
Convert kilograms, pounds, ounces and grams.
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Currency Converter
Convert between 30+ world currencies at live exchange rates. Free, no signup.
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Volume Converter
Liters, gallons, cups, pints, fluid ounces — live bidirectional.
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Speed Converter
km/h, mph, m/s, knots and Mach with instant conversion.
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Data Storage Converter
Bits, bytes, KB/MB/GB/TB and binary KiB/MiB/GiB.
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Time Unit Converter
Seconds, minutes, hours, days, weeks, months and years.
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Area Converter
m², ft², acres, hectares, square miles — bidirectional.
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Pressure Converter
Pascal, bar, atm, psi, mmHg and millibar conversions.
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Energy Converter
Joule, calorie, kWh, BTU and electronvolt conversions.
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Power Converter
Watts, kilowatts, horsepower and BTU/hour conversions.
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Frequency Converter
Hz, kHz, MHz, GHz and RPM live conversion.
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Angle Converter
Degrees, radians, gradians, turns and arc minutes/seconds.
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Force Converter
Newton, kilonewton, dyne, pound-force and kilogram-force.
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Torque Converter
N·m, kgf·m, lb·ft and lb·in torque conversions.
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Fuel Economy Converter
MPG (US/UK), km/L and L/100 km with inverse handling.
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Cooking Converter
Cups, tablespoons, teaspoons, ml and fluid ounces.
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Shoe Size Converter
US, UK, EU and CM shoe sizes for men and women.
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Clothing Size Converter
US, UK, EU and IT women's clothing size mapping.
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Roman Numeral Converter
Convert between Arabic numbers (1–3999) and Roman numerals.
0x
Number Base Converter
Binary, octal, decimal and hexadecimal — all at once.
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Bitrate Converter
Mbit/s, MB/s, Gbit/s and GB/s network/disk speeds.
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Density Converter
kg/m³, g/cm³, lb/ft³ and lb/in³ density units.