🧮
Energy Converter
Convert between energy units — joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU.
Conversion Formula
1 cal = 4.184 J · 1 kWh = 3,600,000 J · 1 BTU = 1,055.06 J · 1 Wh = 3,600 J
Common Energy Converter Reference
| From | Equals | Also |
|---|
| 1 J | 0.239 cal | 0.000277778 Wh |
| 1 kcal | 4,184 J | 1.163 Wh |
| 1 Wh | 3,600 J | 860.421 cal |
| 1 kWh | 3,600,000 J | 860.421 kcal |
| 1 BTU | 1,055.06 J | 252.164 cal |
| 1 ft·lb | 1.35582 J | 0.324048 cal |
How to Convert Energy
- Enter the value you want to convert.
- Choose the From unit.
- Choose the To unit.
- Click Convert to see the result instantly.
Frequently Asked Questions
How many joules are in a calorie?+
1 calorie (thermochemical) = 4.184 joules (exact).
How many joules are in a kilowatt-hour?+
1 kWh = 3,600,000 joules (exact).
What is the difference between cal and kcal?+
1 kcal (kilocalorie) = 1,000 cal. Food energy is usually measured in kcal (often called 'Calories' with capital C).
How many kWh does a 1000W appliance use in 1 hour?+
1 kWh. Power (kW) × time (h) = energy (kWh).
What is a BTU?+
British Thermal Unit. 1 BTU = 1,055.06 joules. Commonly used in air conditioning and heating.
We’d Love Your Feedback! 🌟
