Result
0.0000000 cal
1 J = 0.2390 cal
Converter Guide
Energy Converter
Joules, kilowatt-hours, calories, BTUs — energy is the currency of the universe, but it comes in many denominations. Convert between them for science, nutrition, engineering, and beyond.
How to Use
- Enter the energy value you want to convert.
- Choose your source unit — e.g., kWh, Joule, calorie.
- Choose your target unit — e.g., BTU, MJ, kcal.
- The result updates instantly in real time.
- Tap ⇄ Invert to switch source and target units.
Use Cases
Electricity
Convert kWh to joules for energy audits and bills.
Nutrition
Compare food energy in calories vs kilojoules on labels.
Heating
Convert BTU for HVAC, furnaces, and boiler sizing.
Physics
Work in joules, ergs, or eV for scientific calculations.
Key Formulas
1 kWh = 3,600,000 J
1 kcal = 4,184 J
1 BTU = 1,055.06 J
1 cal = 4.184 J
1 MJ = 1,000,000 J
1 eV = 1.602 × 10⁻¹⁹ J
1 kcal = 4,184 J
1 BTU = 1,055.06 J
1 cal = 4.184 J
1 MJ = 1,000,000 J
1 eV = 1.602 × 10⁻¹⁹ J
Units Supported
JouleKilojouleMegajoulekWhWhCalorieKilocalorieBTUElectron VoltErgFoot-poundTherm
FAQs
▸ What is a kilowatt-hour exactly?
▸ How do calories relate to joules?
▸ What's an electron volt used for?