Part of Unit converters
About Energy Converter
Convert joules, calories, kilowatt-hours, BTUs, and electronvolts. Energy appears in nutrition labels, utility bills, physics problems, and battery datasheets.
How to Use Energy Converter
Select the energy unit you have. Enter the quantity. Pick the target unit. Use the output in cost estimates or homework.
When to Use Energy Converter
Physics: Convert joules to eV for particle energy exercises. Nutrition: Compare kilojoules with dietary calories (1 kcal ≈ 4.184 kJ). Utilities: Relate kWh on electric bills to joules for science class. HVAC: Translate BTU ratings on heaters to watts.
Why Use This Energy Converter?
Food “calories” are actually kilocalories—a common source of confusion. Read labels and pick the calorie unit that matches your table.
How to use
1. Select the energy unit you have.
2. Enter the quantity.
3. Pick the target unit.
4. Use the output in cost estimates or homework.
Frequently asked questions
How many joules in a kilowatt-hour?
3.6 million joules (3.6 × 10⁶ J). Useful for utility bill vs physics homework.
Dietary calories vs calories in physics?
Nutrition labels use kilocalories (kcal) but often print “Calories.” 1 kcal ≈ 4.184 kJ.