Science Unit Converter Convert temperature, pressure, and energy units. Educational converter for quick checks. Temperature Pressure Energy Value Enter a temperature value. From °C °F K Select input unit. To °C °F K Select output unit. Convert Reset Converted — — Quick view — Value Enter a pressure value. From Pa kPa bar atm mmHg Select input unit. To Pa kPa bar atm mmHg Select output unit. Convert Reset Converted — — Quick view — Value Enter an energy value. From J kJ kcal kWh Select input unit. To J kJ kcal kWh Select output unit. Convert Reset Converted — — Quick view —