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Science Unit Converters

Pressure, energy, power, and angles.

Engineering and science problems mix SI units with legacy units that are still common in practice — tyre pressure in PSI, food energy in kilocalories, engine output in horsepower, or angles in degrees where a formula expects radians.

Each converter here works through the SI base unit (pascal, joule, watt, radian) using defined factors such as 1 atm = 101,325 Pa, 1 kcal = 4184 J, and 1 mechanical horsepower = 745.6999 W. Results carry enough precision for coursework and everyday engineering checks; for certified measurements, follow the rounding rules of your standard or specification.

All science unit converters

Pick a tool to see the calculator, formula, worked example, and FAQs.

Science Pressure Converter Convert Pa, kPa, bar, PSI, atm, Torr, mmHg. Science Energy Converter Convert J, kJ, cal, kcal, Wh, kWh, BTU. Science Power Converter Convert W, kW, MW, horsepower, BTU/h. Science Angle Converter Convert degrees, radians, gradians, arcminutes.

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