Energy Converter

Convert joules, calories, kWh, BTU and electronvolts.

Value

Decimal places

From

1 kWh in joule

3,600,000 J

1 kWh = 3600000 J

1 kWh expressed in every energy & work unit.
Unit	Symbol	Value
Joule	J	3,600,000
Kilojoule	kJ	3,600
Megajoule	MJ	3.600000
Calorie (thermochemical)	cal	860,420.650096
Kilocalorie (food Calorie)	kcal	860.420650
Watt hour	Wh	1,000
Kilowatt hour	kWh	1
Electronvolt	eV	22,469,432,668,058,746,000,000,000
British thermal unit	BTU	3,412.141633
Therm	thm	0.034121
Foot-pound	ft·lb	2,655,223.737398

What does Energy Converter do?

Convert between eleven energy units spanning nutrition, electricity billing, heating and physics. Food Calories and thermochemical calories are handled distinctly, since they differ by a factor of a thousand.

How to Use Energy Converter

1
Enter an energy valueAny number.
2
Pick the unitsWatch the calorie distinction.
3
Read the conversionsEvery unit updates together.

Key Features

Eleven units from electronvolts to therms
Food Calories (kcal) distinguished from thermochemical calories
kWh included for electricity bill calculations
BTU and therm for heating and gas
All units shown at once

Frequently Asked Questions

Is a food Calorie the same as a calorie?

No — and the capital C is the only clue. A food Calorie is a kilocalorie, 1,000 small calories or 4,184 joules. A 500 Calorie meal is 500 kcal, not 500 cal.

How many joules in a kilowatt hour?

3,600,000. A kilowatt sustained for an hour is 1,000 watts × 3,600 seconds. That is why electricity is billed in kWh rather than joules — the numbers stay manageable.

What is a BTU?

The energy to raise one pound of water by one degree Fahrenheit, about 1,055 joules. It is standard for heating, air conditioning and gas appliances in the US and UK.