Energy Converter

Convert among joules, calories, kWh, BTU, foot-pound, eV and more.

Joules (J)

Kilojoules (kJ)

Megajoules (MJ)

Gigajoules (GJ)

Watt-hour (Wh)

Kilowatt-hour (kWh)

Megawatt-hour (MWh)

Calorie (cal)

Kilocalorie (kcal)

BTU (IT)

Foot-pound (ft·lbf)

Electronvolt (eV)

Rounding

Key factors: 1 Wh = 3,600 J · 1 kWh = 3.6×10⁶ J · 1 cal = 4.184 J · 1 kcal = 4,184 J · 1 BTU (IT) ≈ 1,055.0559 J · 1 ft·lbf ≈ 1.3558179 J · 1 eV = 1.602176634×10⁻¹⁹ J