Professional Tool
Energy Unit Converter
Precision conversion between all standard energy units including joules, calories, and watt-hours
Energy Converter
Convert between different units of energy measurement.
Common Conversions
Quick reference for frequently used conversions
J → cal
1 J = 0.239 cal
kcal → kJ
1 kcal = 4.184 kJ
kWh → MJ
1 kWh = 3.6 MJ
BTU → J
1 BTU = 1055 J
eV → J
1 eV = 1.602×10⁻¹⁹ J
cal → J
1 cal = 4.184 J