Energy Converter

Convert units in the energy converter category with fast, accurate online tools.

About energy units

Energy is the capacity to do work. Joule (J) is SI; calorie and BTU are legacy units; Wh/kWh for electricity.

Browse common units in this category and learn where they are typically used.

BTU (IT) (btu)
BTU (IT) is an energy unit used to describe work, heat, or stored energy.
Calorie (cal) (cal)
Calorie (cal) ≈ 4.184 J; used in thermochemistry.
Joule (J) (j)
Joule (J) = 1 N·m = energy of 1 newton over 1 meter.
Kilocalorie (kcal) (kcal)
Kilocalorie (kcal) = ‘food Calorie’; ≈ 4,184 J.
Kilowatt-hour (kWh) (kwh)
1 kWh = 3.6 MJ, the billing unit for electricity.
Watt-hour (Wh) (wh)
Watt-hour (Wh) is an energy unit used to describe work, heat, or stored energy.

Start with some of the most frequently used conversions in this category.

Open a few ready-made examples for common real-world conversions.

Is energy conversion exact?

Energy Converter results use the defined factors for the selected units. Displayed results may be rounded.

Can I share a specific result?

Yes. Enter a value in the converter and copy its shareable result URL.

Explore other measurement categories available on MeasureCalc.