Energy Converter

unit-converter

Convert between SI, electrical, thermal/fuel, mechanical, and atomic energy units. All Unit Conversions panel included.

Convert Energy

Formula will appear here

All Unit Conversions

Tons of Oil Equivalent0.000000
Gigajoules0.000000
Million BTU (MMBtu, IT)0.000000
Therm0.000000
Kilowatt Hours0.000000
Kilowatt-hour (thermal)0.000000
Megajoules0.000000
Kilocalories0.000000
Watt Hours0.000000
Kilojoules0.000000
British Thermal Units0.000000
Calories0.000000
Feet-Pounds0.000000
Joules0.000000
Gigaelectronvolts0.000000
Megaelectronvolts0.000000
Electronvolts0.000000

Dedicated converters (SI, electrical, thermal/fuel, nutrition, mechanical, and atomic energy units)

272 pages — every pair of units below, with fixed input/output, formulas, examples, and conversion tables.

Energy Converter Guide

Quick start

  • Enter a value and pick source and target units. The result updates as you type.
  • Use swap to reverse units and copy to copy the result. The All Unit Conversions panel lists your value across every supported energy unit.

Formulas & deeper content

Need formulas, worked examples, and tables for one pair (e.g. kilowatt-hours to joules)? Use a dedicated converter from the list above.

Short answers to common questions are in the FAQ section above. Thermochemical calories and IT BTU match the factors in this tool.

Example uses

  • Nutrition: kilocalories and calories.
  • Electricity: kilowatt-hours and watt-hours.
  • Science: joules, kilojoules, and electronvolts.
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