All Unit Converters
Browse 20+ free online unit converters for length, weight, temperature, currency, area, volume, speed, energy, power, and more.
Browse by Type
Length
cm, inches, feet, miles & more
Weight
kg, lbs, ounces, stones & more
Temperature
Celsius, Fahrenheit, Kelvin
Currency
USD, EUR, GBP, JPY & more
Volume
cups, liters, gallons & more
Area
sqm, sqft, acres & more
Speed
mph, kph, knots & more
Data Storage
KB, MB, GB, TB & more
Energy
joules, calories, kWh, BTU & more
Pressure
PSI, bar, pascal, atm & more
Power
watts, horsepower, kW & more
Torque
Nm, lb-ft, kgf·m & more
Fuel Economy
MPG, L/100km, km/L & more
Time
seconds, minutes, hours, days & more
Frequency
Hz, kHz, MHz, GHz, RPM & more
Force
newtons, lbf, kgf & more
Density
kg/m³, g/cm³, lb/ft³ & more
Angle
degrees, radians, gradians & more
Illuminance
lux, foot-candles & more
All converters
Measurement
Length Converter
Convert between centimeters, inches, meters, feet, yards, kilometers, and miles
Weight Converter
Convert between kilograms, pounds, grams, ounces, tons, and stone
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, and years
Area Converter
Convert between square meters, square feet, acres, hectares, and more area units
Volume Converter
Convert between liters, gallons, cups, milliliters, ounces, and more volume units
Speed Converter
Convert between mph, km/h, m/s, knots, and more speed units
Pressure Converter
Convert between PSI, bar, pascal, atmosphere, and more pressure units
Physics
Energy Converter
Convert between joules, calories, BTU, kWh, and more energy units. Perfect for physics, nutrition, and electricity calculations.
Power Converter
Convert between watts, horsepower, BTU/h, and more power units. Essential for automotive, electrical, and HVAC calculations.
Torque Converter
Convert between newton-meter, foot-pound, kilogram-force meter, and more torque units. Essential for automotive and mechanical engineering.
Frequency Converter
Convert between hertz, kilohertz, megahertz, gigahertz, RPM, and more frequency units. Essential for radio, audio, and CPU specifications.
Force Converter
Convert between newtons, pounds-force, kilogram-force, and more force units. Essential for engineering, physics, and mechanical calculations.
Density Converter
Convert between kg/m³, g/cm³, lb/ft³, and more density units. Essential for science, chemistry, and material properties.
Illuminance Converter
Convert between lux, foot-candles, and more illuminance units. Essential for lighting design, photography, and building codes.
Why ConvertRubix?
- 100% free — no signup or paywall
- All conversions run in your browser
- Works on mobile, tablet, and desktop
- Your data never leaves your device
Need to convert many values?
Use our bulk converter to process up to 1,000 values — paste from Excel or upload CSV.
Popular: cm to inches · kg to lbs · USD to EUR · Guides