Energy Power Converter
Free online energy unit converter.
Convert between all energy units instantly with accurate results, formulas, and reference tables.
No signup required.
Last updated · How we build & check our tools
Frequently Asked Questions
Common questions about the Energy Power Converter
Energy = Power × Time. 1 kW for 1 hour = 1 kWh. Power is rate of energy use.
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Sources & References
International System of Units (SI): energy, work and heat
Energy, work and heat is measured in the joule (J); 1 cal = 4.184 J. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
International System of Units (SI)
Authoritative definitions for energy, work and heat, from the BIPM SI Brochure (9th edition), the defining reference for the SI.