Loading Conversion Tools...
Free energy converter to convert Joules to calories, kilowatt-hours (kWh) to Joules, and BTUs. Accurate calculations for electricity bills, nutrition & physics.
Energy and power comparison
| Kilowatt-hour (kWh) | Joule (J) | Joule (Reverse) | Kilowatt-hour Equivalent | Action |
|---|---|---|---|---|
| 0.1 kWh | 360,000.00000 J | 0.1 J | 0.00000 kWh | |
| 0.5 kWh | 1,800,000.00000 J | 0.5 J | 0.00000 kWh | |
| 1 kWh | 3,600,000.00000 J | 1 J | 0.00000 kWh | |
| 2 kWh | 7,200,000.00000 J | 2 J | 0.00000 kWh | |
| 5 kWh | 18,000,000.00000 J | 5 J | 0.00000 kWh | |
| 10 kWh | 36,000,000.00000 J | 10 J | 0.00000 kWh | |
| 20 kWh | 72,000,000.00000 J | 20 J | 0.00001 kWh | |
| 50 kWh | 180,000,000.00000 J | 50 J | 0.00001 kWh | |
| 100 kWh | 360,000,000.00000 J | 100 J | 0.00003 kWh | |
| 500 kWh | 1,800,000,000.00000 J | 500 J | 0.00014 kWh | |
| 1000 kWh | 3,600,000,000.00000 J | 1000 J | 0.00028 kWh |
Symbol: J. Commonly used in: si.
Symbol: kJ. Commonly used in: metric.
Symbol: MJ. Commonly used in: metric.
Symbol: cal. Commonly used in: metric.
Symbol: kcal. Commonly used in: metric.
Every conversion starts with the standard baseline rate between these two units:
Multiply your entered number by the conversion rate to calculate the exact target value:
The result is neatly rounded to your preferred decimal setting so it is clear and ready to use:
| Unit Name | Symbol | System | Conversion Rate | Common Uses |
|---|---|---|---|---|
| Joule | J | si | 1 J = 1.000000 J | Everyday, home, and school measurements in Energy & Work. |
| Kilojoule | kJ | metric | 1 kJ = 1,000.000000 J | Everyday, home, and school measurements in Energy & Work. |
| Megajoule | MJ | metric | 1 MJ = 1,000,000.000000 J | Everyday, home, and school measurements in Energy & Work. |
| Calorie (gram) | cal | metric | 1 cal = 4.184000 J | Everyday, home, and school measurements in Energy & Work. |
| Kilocalorie (food Cal) | kcal | metric | 1 kcal = 4,184.000000 J | Everyday, home, and school measurements in Energy & Work. |
| Watt-hour | Wh | other | 1 Wh = 3,600.000000 J | Everyday, home, and school measurements in Energy & Work. |
| Kilowatt-hour | kWh | other | 1 kWh = 3,600,000.000000 J | Everyday, home, and school measurements in Energy & Work. |
| British Thermal Unit (ISO) | BTU | imperial | 1 BTU = 1,055.055850 J | Everyday, home, and school measurements in Energy & Work. |
| Foot-pound force | ft·lbf | imperial | 1 ft·lbf = 1.355818 J | Everyday, home, and school measurements in Energy & Work. |
| Electronvolt | eV | si | 1 eV = 0.000000 J | Everyday, home, and school measurements in Energy & Work. |
Named after James Prescott Joule, who proved the mechanical equivalence of heat in the 1840s.
Be careful to distinguish between a small calorie (cal = 4.184 J) and a food Calorie (kcal = 4,184 J).
There are exactly 3,600,000 Joules (3.6 Megajoules) in 1 kWh (1,000 Watts × 3,600 seconds).
Multiply Calories by 4.184. For example, a 250-calorie snack contains approximately 1,046 kJ.
Every calculation uses trusted, standard definitions so your results are 100% accurate for school, home, work, and recipes.
