Kilowatt-hours to Joules

Convert kWh to J instantly — with a table, common energy values, and a live calculator.

1 kWh equals 3600000 J.

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Result (J)3600000 J

kWh to J table

kWhJ
1 kWh3600000 J
2 kWh7200000 J
3 kWh10800000 J
5 kWh18000000 J
10 kWh36000000 J
15 kWh54000000 J
20 kWh72000000 J
25 kWh90000000 J
30 kWh108000000 J
40 kWh144000000 J
50 kWh180000000 J
60 kWh216000000 J
75 kWh270000000 J
90 kWh324000000 J
100 kWh360000000 J
120 kWh432000000 J
150 kWh540000000 J
200 kWh720000000 J
250 kWh900000000 J
300 kWh1080000000 J
400 kWh1440000000 J
500 kWh1800000000 J

J to kWh (reverse)

JkWh
1 J0.000000278 kWh
2 J0.000000556 kWh
3 J0.000000833 kWh
5 J0.00000139 kWh
10 J0.00000278 kWh
15 J0.00000417 kWh
20 J0.00000556 kWh
25 J0.00000694 kWh
30 J0.00000833 kWh
40 J0.0000111 kWh
50 J0.0000139 kWh
60 J0.0000167 kWh
75 J0.0000208 kWh
90 J0.000025 kWh
100 J0.0000278 kWh
120 J0.0000333 kWh
150 J0.0000417 kWh
200 J0.0000556 kWh
250 J0.0000694 kWh
300 J0.0000833 kWh
400 J0.000111 kWh
500 J0.000139 kWh

Common energy values

kWhJ
5 kWh18000000 J
10 kWh36000000 J
25 kWh90000000 J
50 kWh180000000 J
75 kWh270000000 J
100 kWh360000000 J
120 kWh432000000 J
150 kWh540000000 J
200 kWh720000000 J
300 kWh1080000000 J
400 kWh1440000000 J
500 kWh1800000000 J

How it scales

900000001800000002700000003600000000255075100kWh

1 kWh in other units

860kcal3.6MJ3412BTU1000Wh

The ratio at a glance

1 kWh3600000 J

Joules, kWh, and calories — the key energy units

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill and equals 3.6 MJ. With calories there are two sizes that must not be confused: the kilocalorie (kcal) on nutrition labels equals exactly 4184 J (4.184 kJ), while the small calorie (cal) is only 4.184 J — they differ by a factor of 1000. The BTU (British thermal unit) equals 1055.06 J and is used in heating and air-conditioning.

Energy conversions are exact and rest on fixed factors — for more unit pairs, use our energy conversion hub.

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Frequently asked questions

How many J are in 1 kWh?

1 kWh equals 3600000 J.

How many J are in 2 kWh?

2 kWh equal 7200000 J.

How do I convert kWh to J?

Multiply the energy in kWh by 3600000 to get J.

Is the kWh-to-J conversion exact?

Yes. Energy conversions are exact; the values here are only rounded to two decimal places.

What are these energy units used for?

Joules (J), kilojoules (kJ), and megajoules (MJ) are the SI units of energy. The kilowatt-hour (kWh) is the unit on your electricity bill, kilocalories (kcal) appear on food labels, and the BTU (British thermal unit) is used in heating and air-conditioning.

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