Kilowatt-Hours (kWh) to Joules (J) Converter
Enter a value to instantly convert between energy units.
1 Kilowatt-Hour = 3600000 Joule
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
J = kWh × 3600000A kilowatt-hour (kWh) is exactly 3.6 million joules — the energy of 1000 watts operating for one hour. Electricity is billed in kWh because the numbers are manageable (a home uses hundreds of kWh per month), while scientific and engineering work uses joules. For the reverse, see [joules to kilowatt-hours](/energy/joules-to-kwh/).
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A homeowner converting 1 kWh from their electricity bill to joules for a science project — 3,600,000 J.
1 kWh = 3600000 J
An energy auditor calculating 50 kWh monthly usage in joules reports 180,000,000 J (180 MJ).
50 kWh = 180000000 J
A factory measuring 0.5 kWh of machine energy per cycle converts to 1,800,000 J for the efficiency report.
0.5 kWh = 1800000 J
A solar installer calculating 100 kWh daily production in joules gets 360,000,000 J for the system design.
100 kWh = 360000000 J