kWh to Joules Converter
Perfect for electricity bills, battery specs, and physics homework. Convert between kilowatt-hour (kWh), watt-hour (Wh), joule (J), kilojoule (kJ), and megajoule (MJ) using the exact energy identity 1 kWh = 3,600,000 J.
Converter
Results
Kilowatt-hours (kWh)
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Watt-hours (Wh)
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Joules (J)
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Kilojoules (kJ)
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Megajoules (MJ)
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Steps
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Why 1 kWh = 3,600,000 J
A watt is a joule per second (1 W = 1 J/s). A kilowatt-hour is power × time:
1 kWh = 1000 W × 3600 s = 1000 × 3600 J = 3,600,000 J
1 kWh = 3.6 × 106 J = 3.6 MJ
So every time you see 1 kWh on an electricity bill, that corresponds to exactly 3.6 megajoules of energy.
Formulas used
kWh → Wh: Wh = kWh × 1000
kWh → J: J = kWh × 3,600,000
J → kWh: kWh = J ÷ 3,600,000
J → kJ: kJ = J ÷ 1000
J → MJ: MJ = J ÷ 1,000,000
FAQ
Is kWh a unit of power or energy?
It’s a unit of energy. Power would be kW. Energy is power × time.
Can I use this for batteries?
Yes — many batteries are in Wh or kWh. Convert to joules to compare with physics calculations.