Energy Converter

Unit converter

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Energy Converter

Convert between 23 energy units instantly. Select your units from the Builder tab or type a conversion like "100 cm to inches" in the AI input. Every conversion shows the full step-by-step calculation.

This converter covers all standard energy units including metric and imperial systems. Use the reference table below to see how each unit relates to the base unit (joule).

Complete list of Joules Energy conversions

Energy units reference

Unit	Symbol	joule
BTU (thermochemical)	BTU(th)	1054.35
British Thermal Unit	BTU	1055.06
Calorie	cal	4.184
Electronvolt	eV	1.602 × 10⁻¹⁹
Erg	erg	1 × 10⁻⁷
Foot-pound	ft·lb	1.35582
Gigajoule	GJ	1000000000
Hartree	Eₕ	4.36 × 10⁻¹⁸
Horsepower-Hour	hp·h	2684520
Joule	J	1
Kilocalorie	kcal	4184
Kilojoule	kJ	1000
Kilowatt-hour	kWh	3600000
Megajoule	MJ	1000000
Megawatt-hour	MWh	3600000000
Quad	quad	1.055 × 10¹⁸
Rydberg	Ry	2.18 × 10⁻¹⁸
Therm	thm	1.055 × 10⁸
Ton of Coal Equivalent	tce	29307600000
Ton of Oil Equivalent	toe	41868000000
Ton of TNT	tTNT	4184000000
Watt-Second	W·s	1
Watt-hour	Wh	3600

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