Physics Unit Converters

Free online physics converters. Select a tool below to convert instantly with accurate, bidirectional results.

Convert between joules, calories, BTU, kWh, and more energy units. Perfect for physics, nutrition, and electricity calculations.

Convert between watts, horsepower, BTU/h, and more power units. Essential for automotive, electrical, and HVAC calculations.

Convert between newton-meter, foot-pound, kilogram-force meter, and more torque units. Essential for automotive and mechanical engineering.

Convert between hertz, kilohertz, megahertz, gigahertz, RPM, and more frequency units. Essential for radio, audio, and CPU specifications.

Convert between newtons, pounds-force, kilogram-force, and more force units. Essential for engineering, physics, and mechanical calculations.

Convert between kg/m³, g/cm³, lb/ft³, and more density units. Essential for science, chemistry, and material properties.

Convert between lux, foot-candles, and more illuminance units. Essential for lighting design, photography, and building codes.

Why ConvertRubix?

Use our bulk converter to process up to 1,000 values — paste from Excel or upload CSV.