Common Conversions
| From | J | cal | BTU |
|---|---|---|---|
| 1000 J | 1000 | 239.006 | 0.947813 |
| 1 kWh | 3600000 | 860421 | 3412.13 |
| 100 cal | 418.4 | 100 | 0.396565 |
| 1 BTU | 1055.06 | 252.165 | 1 |
About Energy Unit Converter
Convert between energy units including joules (J), kilojoules (kJ), calories (cal), kilocalories (kcal), kilowatt-hours (kWh), and British Thermal Units (BTU). One kilowatt-hour equals 3,600,000 joules, and one food calorie (kcal) equals 4,184 joules. Useful for physics, nutrition, and energy consumption calculations.
How to Use Energy Unit Converter
- 1
Enter an energy value
Type the energy amount in the unit you want to convert from.
- 2
Select your unit
Choose the source unit from the dropdown (joules, calories, kWh, BTU, etc.).
- 3
Read the conversions
All equivalent energy values in other units appear instantly.
Common Use Cases
- Physics and engineering homework and calculations
- Comparing food energy (calories) to physical units
- Calculating electricity consumption in joules or BTU
- Understanding heating and cooling system energy ratings
Frequently Asked Questions
How many joules are in a kilowatt-hour?
How many calories are in a joule?
What is a BTU?
Related Tools
Unit Converter
Convert between units of length, weight, temperature, volume, and more.
Celsius to Fahrenheit Converter
Convert temperatures between Celsius and Fahrenheit scales.
Calorie Calculator
Calculate daily calorie needs based on age, weight, height, and activity level.
Color Converter
Convert between HEX, RGB, and HSL color formats with a live preview.
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, and octal bases.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back.