📏 Unit Converters
Length, weight, temperature, pressure, torque — precise conversions with every unit shown.
All unit converters
Unit Converter
Length, weight, temperature, volume, area and speed.
Temperature Converter
Celsius ⇄ Fahrenheit ⇄ Kelvin, with formulas.
Length Converter
cm ⇄ inches, miles ⇄ km, feet ⇄ meters and more.
Weight Converter
kg ⇄ lbs, grams ⇄ ounces, stone and tons.
Volume Converter
Liters ⇄ gallons, mL ⇄ fl oz, cups, pints, quarts.
Area Converter
sq ft ⇄ m², acres ⇄ hectares, km² ⇄ sq miles.
Speed Converter
km/h ⇄ mph, knots, m/s and ft/s.
Pressure Converter
PSI ⇄ bar, kPa, atmospheres and mmHg.
Energy Converter
Joules ⇄ calories, kWh, BTU and kilojoules.
Fuel Economy Converter
MPG ⇄ L/100km ⇄ km/L, US and UK gallons.
Cooking Measurement Converter
Cups ⇄ tbsp ⇄ tsp ⇄ mL — plus a grams-per-cup guide.
Roman Numeral Converter
2024 ⇄ MMXXIV — numbers to Roman numerals and back.
Density Converter
kg/m³ ⇄ g/cm³, lb/ft³, kg/L and more.
Data Transfer Converter
Mbps ⇄ MB/s, Gbps, kbps — bits vs bytes sorted.
Torque Converter
N·m ⇄ lb-ft, lb-in, kgf·m for wrench and engine specs.
About these tools
Convert between metric and imperial across length, weight, volume, area, speed, temperature, pressure, energy, density, torque, fuel economy, cooking measures and data-transfer rates. Every converter shows the result in all units at once, uses exact international definitions (2.54 cm to the inch, 453.59237 g to the pound), and includes reference tables for the values people actually look up.
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