Energy Converter
Convert between Joules, calories, kilowatt-hours, BTU and more energy units.
What is Energy?
Energy is the capacity to do work. It exists in many forms - kinetic, potential, thermal, electrical, chemical, and nuclear. The SI unit is the Joule (J), but calories are used for food energy and kWh for electricity.
Understanding energy conversion is essential for nutrition (food calories), electricity bills (kWh), heating (BTU), and physics calculations (Joules).
Energy Conversion Formulas
| From | To | Multiply by |
|---|---|---|
| 1 kJ | Joules | 1,000 |
| 1 kcal | Joules | 4,184 |
| 1 kWh | Joules | 3,600,000 |
| 1 BTU | Joules | 1,055.06 |
| 1 kcal | kJ | 4.184 |
Common Energy Values
- Daily food intake: ~2,000 kcal (8,368 kJ)
- 1 gram of fat: 9 kcal (37.7 kJ)
- 1 gram of carbs/protein: 4 kcal (16.7 kJ)
- Average home electricity: 30 kWh/day
Frequently Asked Questions
What's the difference between a calorie and a Calorie?
A small calorie (cal) raises 1g of water by 1°C. A food Calorie (Cal or kcal) equals 1,000 small calories. Food labels use "Calories" which are actually kilocalories.
How do I convert kWh to Joules?
1 kWh = 3,600,000 Joules. A kilowatt-hour is the energy used by a 1,000-watt device running for 1 hour.
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