Energy Converter

Convert energy between various units. Perfect for nutrition, electricity consumption, physics, and engineering calculations.

From
Enter energy value
To
Converted value
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About Energy Conversion

Energy is the capacity to do work or produce heat. It can take many forms and is measured in joules in the International System of Units (SI).

Common Energy Units

SI Units

  • Joule (J) - The SI unit of energy (kg·m²/s²)
  • Kilojoule (kJ) - 1,000 joules

Nutrition & Heat

  • Calorie (cal) - Amount of energy to raise 1g water by 1°C
  • Kilocalorie (kcal) - 1,000 calories, used in nutrition (food Calories)
  • British Thermal Unit (BTU) - Energy to raise 1 lb water by 1°F

Electrical

  • Watt-hour (Wh) - Energy from 1 watt for 1 hour
  • Kilowatt-hour (kWh) - 1,000 Wh, used for electricity billing

Other Units

  • Electronvolt (eV) - Energy gained by an electron, used in particle physics
  • Foot-pound (ft·lb) - Work done lifting 1 pound by 1 foot

Quick Reference

  • 1 kJ = 1,000 J = 0.239 kcal
  • 1 kcal = 4.184 kJ (food Calorie)
  • 1 kWh = 3,600 kJ = 3.6 MJ
  • 1 BTU = 1,055 J
  • 1 kWh = 3,412 BTU

Energy Examples

  • AA Battery: ~9,360 J (2.6 Wh)
  • Apple (100g): ~218 kJ (52 kcal)
  • Candy Bar: ~1,000 kJ (240 kcal)
  • Average Home Daily Use: ~30 kWh
  • Gasoline (1 liter): ~34.2 MJ

Common Uses

  • Nutrition - Kilocalories (kcal, often just "Calories")
  • Electricity Bills - Kilowatt-hours (kWh)
  • Physics - Joules, electronvolts
  • HVAC Systems - BTU
  • Mechanical Work - Joules, foot-pounds