Kilowatt-Hours (kWh) to Kilojoules (kJ) Converter
Enter a value to instantly convert between energy units.
1 Kilowatt-Hour = 3600 Kilojoule
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
kJ = kWh × 3600Kilowatt-hours are the billing unit for electricity (how your power bill is calculated), while kilojoules are the SI energy unit used in physics, engineering, and scientific standards. You need this conversion when translating electricity usage into technical specifications, comparing home energy consumption to appliance efficiency ratings (often in kJ per cycle), or converting solar production data (in kWh) for system design calculations that use SI units.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A homeowner's monthly utility bill: 1 kWh = 3,600 kJ. A 500 kWh bill = 1,800,000 kJ, the SI measure of household electricity consumption.
1 kWh = 3600 kJ
A solar installer sizing a system. Customer uses 10 kWh/day = 36,000 kJ/day. A 5 kW array producing 8 peak-sun-hours daily generates exactly 40 kWh (144,000 kJ), covering demand with headroom.
10 kWh = 36000 kJ
An appliance manufacturer converting efficiency specs. A dishwasher that consumes 0.5 kWh per cycle (1,800 kJ) is rated 'efficient' if it cleans 150 dishes — common Energy Star benchmark.
0.5 kWh = 1800 kJ
A commercial building auditor calculating annual electricity. Monthly usage ~730 kWh (2,628,000 kJ/month) × 12 = 8,760 kWh/year. Helps identify demand-response opportunities.
730 kWh = 2628000 kJ