Kilowatt-hours to Joules Converter
kWh → J · ⚡ Energy
1 Kilowatt-hours = 3,600,000 Joules
How to convert Kilowatt-hours to Joules
To convert Kilowatt-hours to Joules, multiply the value in Kilowatt-hours by 3,600,000. For example, 5 kWh = 18,000,000 J.
If you need to convert from Kilowatt-hours to Joules, the key figure to remember is that one Kilowatt-hours equals 3,600,000 Joules. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert kWh to J with complete confidence.
Energy conversions appear in nutrition, fitness, physics, utility bills, and engineering. The same quantity of energy can be expressed in joules, calories, kilowatt-hours, or BTU depending on the context.
Understanding Kilowatt-hours and Joules
The joule is the SI unit, but everyday contexts use others: food labels use kilocalories (often just called 'calories'), electricity bills use kilowatt-hours, and heating and cooling systems use BTU (British Thermal Units). One food calorie is actually a kilocalorie — 1,000 of the small physics calories — which is a frequent source of confusion.
How accurate is this conversion?
Energy conversions use standard definitions: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055.06 joules. These are internationally agreed values, making the conversions exact.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Kilowatt-hours to Joules values
The most frequently searched conversions are 1 Kilowatt-hours = 3,600,000 Joules, 5 Kilowatt-hours = 18,000,000 Joules, 10 Kilowatt-hours = 36,000,000 Joules, and 100 Kilowatt-hours = 360,000,000 Joules. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: When comparing appliance efficiency or heating costs, convert everything to kilowatt-hours first, since that's the unit your utility bill uses — it makes the real-world cost immediately comparable.
Kilowatt-hours to Joules — Conversion Table
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 0.1 kWh | 360,000 J |
| 0.25 kWh | 900,000 J |
| 0.5 kWh | 1,800,000 J |
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
| 250 kWh | 900,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1000 kWh | 3,600,000,000 J |