Energy converter

Joules to Kilowatt-hours Converter

Convert joules or megajoules into the kilowatt-hours used for electricity billing.

How Joules to kWh works

Joules are the SI unit of energy, but electricity is billed in kilowatt-hours. To convert joules to kWh, divide by 3,600,000 — the number of joules in one kilowatt-hour.

This is the reverse of the kWh-to-joules conversion. It is handy when a device or physics problem gives you energy in joules or megajoules and you want to know the equivalent on an electricity bill.

Formula

1kWh = J ÷ 3,600,000

Divide joules by 3.6 million (or megajoules by 3.6) to get kilowatt-hours.

Joules to kWh conversion table

Reference Table6 rows

Common joule values converted to kilowatt-hours.
Joules↕	Kilowatt-hours↕	Watt-hours↕
360,000 J	0.1 kWh	100 Wh
1,000,000 J	0.2778 kWh	277.8 Wh
3,600,000 J	1 kWh	1,000 Wh
7,200,000 J	2 kWh	2,000 Wh
18,000,000 J	5 kWh	5,000 Wh
36,000,000 J	10 kWh	10,000 Wh

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FAQ: Joules to kWh

How do you convert joules to kWh?

Divide the energy in joules by 3,600,000. For example, 5,000,000 J ÷ 3,600,000 ≈ 1.389 kWh.

How many joules make 1 kWh?

3,600,000 joules equal one kilowatt-hour, so it takes 3.6 million joules to make a single kWh.

What is 1 megajoule in kWh?

One megajoule (1,000,000 J) is about 0.2778 kWh, because 1,000,000 ÷ 3,600,000 ≈ 0.2778.

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