Energy Converter
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours and kilowatt-hours. Handy for science, nutrition and power bills.
All units at once
Theoretical food-energy ↔ electrical-energy equivalents
Electricity cost (kWh × rate)
Equivalence only: kWh and food kcal have the same physical dimension. The numbers are theoretical energy equivalents, not a claim that batteries, bodies, engines or appliances convert energy with the same efficiency.
Appliance running cost: electricity cost calculator.
Convert energy units
Convert clearly named thermochemical, nutritional, electrical and physical energy units. Food-to-electricity comparisons are same-dimension theoretical equivalents only.
FAQ
Which units are supported?
J, kJ, MJ, thermochemical calorie (cal_th), nutritional Calorie (kcal/Cal), Wh, kWh, BTU_IT, electronvolt (eV) and therm.
How many joules in a kWh?
1 kWh = 3,600,000 J. This tool converts in any direction instantly.
What is the difference between cal_th and Cal?
1 thermochemical calorie (cal_th) is exactly 4.184 J. One nutritional Calorie (Cal) is one kilocalorie, exactly 4,184 J here.
Can food kcal and battery kWh be exchanged at 100% efficiency?
No. They share the same physical dimension, so a theoretical energy equivalence can be calculated, but biological, electrical and mechanical efficiencies are different and are not implied by the conversion.
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