About this calculator
One “unit” on an Indian electricity bill is one kilowatt-hour.
How to use it
- Enter the value.
- Choose the unit it is in and the unit you want.
- Read the result, or see every unit in the table.
The formula
Result = value × (joules in the “from” unit) ÷ (joules in the “to” unit)
- 1 kWh
- 3,600,000 J
- 1 kcal
- 4,184 J
- 1 BTU
- 1,055 J
Worked example
One electricity unit
- 1 kWh = 3.6 million joules.
- = 860.4 kcal, roughly a meal’s worth of food energy.
- = 3,412 BTU.
What the result means
The factors are exact international definitions, so results are as accurate as the digits shown.
Assumptions
- Thermochemical calorie (4.184 J).
Limitations
- Food labels may round kcal values.
Frequently asked questions
What is one unit of electricity?
One kilowatt-hour: 1,000 watts used for an hour.
Is a food Calorie the same as a kilocalorie?
Yes.
How many joules in a calorie?
4.184.
Last reviewed on 3 October 2026. Found a mistake? Tell us.