Unit Converters

Energy Converter

Electricity bills, food labels and heating energy in one tool.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Joules
Joules
—
Kilojoules
—
Calories (thermochemical)
—
Food calories (kcal)
—
Watt-hours
—
Kilowatt-hours
—
BTU (IT)
—
Foot-pounds
—

Energy Converter by TheCalcTools

How the Energy Converter works

Enter the energy and choose its unit.

All values are routed through joules.

Kilocalories are the ‘Calories’ on food labels.

The formula

result = value × (factor of the ‘from’ unit ÷ factor of the ‘to’ unit)1 kWh = 3.6 MJ, 1 kcal = 4,184 J, 1 BTU = 1,055.05585262 J

Worked example

Using the default values shown in the calculator:

Value1
FromKilowatt-hours
  1. 1 Kilowatt-hours equals 3600000.00 Joules ; 3600.00 Kilojoules ; 860420.65 Calories (thermochemical).

Result:

Joules3600000.00
Kilojoules3600.00
Calories (thermochemical)860420.65
Food calories (kcal)860.4207
Watt-hours1000.00
Kilowatt-hours1.0000
BTU (IT)3412.14
Foot-pounds2655223.74

Frequently asked questions

How many kilojoules are in a kilocalorie?

4.184 kJ. A 2,000 kcal diet is about 8,368 kJ.

How many BTU in a kWh?

About 3,412 BTU.

Sources and further reading

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.