Converters
Energy Converter
Convert between energy units including joules, calories, kilowatt-hours, and BTU. Perfect for physics, nutrition, and engineering.
Result
4,184
Usage notes
- 1 food Calorie (kcal) = 4,184 joules. Nutrition labels use kilocalories.
- 1 kWh = 3.6 million joules. Your electricity bill is measured in kWh.
- BTU (British Thermal Unit) is commonly used for HVAC and heating systems.
How to Use This Tool
- 1Enter an energy value in the input field.
- 2Select the source unit (From) and target unit (To).
- 3The converted result appears instantly. Use Swap to reverse the direction.
Frequently Asked Questions
- What is the difference between calories and kilocalories?
- 1 kilocalorie (kcal) = 1,000 calories. Food labels list kilocalories but often label them simply as 'Calories' (capital C).
- How do I convert kWh to joules?
- Multiply by 3,600,000. One kilowatt-hour equals 3.6 million joules.
- What is a BTU?
- A British Thermal Unit is the amount of energy needed to raise 1 pound of water by 1 °F. It equals approximately 1,055 joules.
- What is an electron-volt?
- An extremely small unit of energy used in particle physics. 1 eV ≈ 1.602 × 10⁻¹⁹ joules.