Energy Unit Converter

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Energy Conversion for All Needs

Convert between all major energy units with precision. Our energy converter handles units from joules and calories to kilowatt-hours and BTUs, making it essential for physics, engineering, nutrition, and utility calculations.

Common Energy Conversions

  • 1 calorie = 4.184 joules (exact)
  • 1 kilocalorie (food calorie) = 4,184 joules
  • 1 kilowatt-hour (kWh) = 3,600,000 joules
  • 1 BTU = 1,055.06 joules
  • 1 electronvolt (eV) = 1.602176634×10-19 joules (exact)
  • 1 kilogram TNT equivalent = 4,184,000 joules

Energy Units and Standards

The joule (J) is the SI derived unit for energy, work, and heat:

  • Joule (J): SI derived unit
  • Kilojoule (kJ): 1,000 joules
  • Megajoule (MJ): 1,000,000 joules
  • Gigajoule (GJ): 1,000,000,000 joules

Understanding Energy Measurements

Energy is the capacity to do work or produce heat. As a fundamental physical quantity, it appears in many forms including mechanical, electrical, chemical, thermal, and nuclear energy. The diversity of energy applications has led to the development of various specialized units across different fields and industries.

Precision: 15 decimal places
Standard: ISO 80000-5:2019

Energy Units in Different Fields

Physics and Engineering Units

Units commonly used in scientific and engineering contexts:

  • Joule (J): Work done by a force of 1 newton over 1 meter
  • Kilowatt-hour (kWh): Energy of 1 kilowatt power for 1 hour
  • Erg: CGS system unit, equal to 10-7 joules
  • Foot-pound force: Work done by 1 pound-force over 1 foot

Nutrition and Food Energy

Units used for measuring food energy:

  • Calorie (cal): Energy to raise 1g water by 1°C
  • Kilocalorie (kcal): 1,000 calories, the "Calorie" on food labels
  • Kilojoule (kJ): Alternative food energy unit in many countries

Specialized Energy Units

Units for specific applications:

  • British Thermal Unit (BTU): Energy to raise 1 pound of water by 1°F
  • Therm: 100,000 BTU, used in natural gas metering
  • Electronvolt (eV): Energy gained by an electron moving across 1 volt potential
  • Ton of TNT: Used for measuring explosions and nuclear yields

Energy, Power, and Time

Energy and power are related but distinct concepts. Energy is the capacity to do work, while power is the rate at which energy is transferred or consumed: