How many joules are in 1 kilowatt-hour?

1 kWh equals 3600000 J. This is an exact conversion factor defined by NIST.

How do I convert kilowatt-hours to joules?

Multiply the value in kWh by the conversion factor. For example, 10 kWh = 36000000 J. Use our calculator above for instant results.

Is the kilowatt-hours to joules conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert kilowatt-hours to joules offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between kilowatt-hours and joules?

Kilowatt-hours (kWh) and Joules (J) are both units of energy but belong to different measurement systems. 1 kWh = 3600000 J. Use the converter above to switch between them instantly.

Kilowatt-hours to Joules (kWh → J) — Free Online Converter

kWh → J Reference Table

kWh	J
0.001 kWh	3600 J
0.002 kWh	7200 J
0.003 kWh	10800 J
0.004 kWh	14400 J
0.005 kWh	18000 J
0.006 kWh	21600 J
0.007 kWh	25200 J
0.008 kWh	28800 J
0.009 kWh	32400 J
0.01 kWh	36000 J
0.02 kWh	72000 J
0.03 kWh	108000 J
0.04 kWh	144000 J
0.05 kWh	180000 J
0.06 kWh	216000 J
0.07 kWh	252000 J
0.08 kWh	288000 J
0.09 kWh	324000 J
0.1 kWh	360000 J
0.2 kWh	720000 J
0.3 kWh	1080000 J
0.4 kWh	1440000 J
0.5 kWh	1800000 J
0.6 kWh	2160000 J
0.7 kWh	2520000 J
0.8 kWh	2880000 J
0.9 kWh	3240000 J
1 kWh	3600000 J
1.5 kWh	5400000 J
2 kWh	7200000 J
2.5 kWh	9000000 J
3 kWh	10800000 J
3.5 kWh	12600000 J
4 kWh	14400000 J
4.5 kWh	16200000 J
5 kWh	18000000 J
5.5 kWh	19800000 J
6 kWh	21600000 J
6.5 kWh	23400000 J
7 kWh	25200000 J
7.5 kWh	27000000 J
8 kWh	28800000 J
8.5 kWh	30600000 J
9 kWh	32400000 J
9.5 kWh	34200000 J
10 kWh	36000000 J
11 kWh	39600000 J
12 kWh	43200000 J
13 kWh	46800000 J
14 kWh	50400000 J
15 kWh	54000000 J
16 kWh	57600000 J
17 kWh	61200000 J
18 kWh	64800000 J
19 kWh	68400000 J
20 kWh	72000000 J
25 kWh	90000000 J
30 kWh	108000000 J
35 kWh	126000000 J
40 kWh	144000000 J
45 kWh	162000000 J
50 kWh	180000000 J
55 kWh	198000000 J
60 kWh	216000000 J
65 kWh	234000000 J
70 kWh	252000000 J
75 kWh	270000000 J
80 kWh	288000000 J
85 kWh	306000000 J
90 kWh	324000000 J
95 kWh	342000000 J
100 kWh	360000000 J
120 kWh	432000000 J
125 kWh	450000000 J
130 kWh	468000000 J
140 kWh	504000000 J
150 kWh	540000000 J
160 kWh	576000000 J
175 kWh	630000000 J
180 kWh	648000000 J
200 kWh	720000000 J
225 kWh	810000000 J
250 kWh	900000000 J
275 kWh	990000000 J
300 kWh	1080000000 J
350 kWh	1260000000 J
400 kWh	1440000000 J
450 kWh	1620000000 J
500 kWh	1800000000 J
600 kWh	2160000000 J
700 kWh	2520000000 J
750 kWh	2700000000 J
800 kWh	2880000000 J
900 kWh	3240000000 J
1000 kWh	3600000000 J
1200 kWh	4320000000 J
1250 kWh	4500000000 J
1500 kWh	5400000000 J
1750 kWh	6300000000 J
2000 kWh	7200000000 J
2500 kWh	9000000000 J
3000 kWh	10800000000 J
4000 kWh	14400000000 J
4500 kWh	16200000000 J
5000 kWh	18000000000 J
6000 kWh	21600000000 J
7000 kWh	25200000000 J
7500 kWh	27000000000 J
8000 kWh	28800000000 J
9000 kWh	32400000000 J
10000 kWh	36000000000 J
15000 kWh	54000000000 J
20000 kWh	72000000000 J
25000 kWh	90000000000 J
50000 kWh	180000000000 J
75000 kWh	270000000000 J
100000 kWh	360000000000 J

Values based on NIST SP 811 conversion factors

Real-World Examples

One unit of household electricity

1 kWh = 3600000 J

Daily electricity for a typical household

10 kWh = 36000000 J

Running a 100W light bulb for 1 hour

0.1 kWh = 360000 J

Charging a Tesla Model 3 (standard range)

50 kWh = 180000000 J

One cycle of a washing machine

0.5 kWh = 1800000 J

Why Convert Kilowatt-hours to Joules?

Converting between kilowatt-hours (kWh) and joules (J) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert kWh to J saves time and prevents errors.

Energy conversions from kWh to J are crucial for dietitians, physicists, and engineers. In nutrition, understanding the link between calories and joules helps individuals manage their diet and energy intake effectively. In the power sector, converting between kilowatt-hours and British Thermal Units (BTU) is necessary for sizing heating and cooling systems for homes and offices. Physicists rely on precise energy unit conversions to calculate work, heat, and thermodynamic processes. Whether tracking fitness goals or analyzing home energy bills, accurate conversion empowers users to make better health and financial decisions.

How to Convert Kilowatt-hours to Joules

To convert kilowatt-hours to joules, use the following formula:

J = kWh × 3600000

Example: 1 kWh = 3600000 J

For example, 5 kWh = 18000000 J, 10 kWh = 36000000 J, and 100 kWh = 360000000 J. For larger values, 1000 kWh = 3600000000 J. Conversely, 1 J = 2.777777778e-7 kWh. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

One unit of household electricity: 1 kWh = 3600000 J
Daily electricity for a typical household: 10 kWh = 36000000 J
Running a 100W light bulb for 1 hour: 0.1 kWh = 360000 J
Charging a Tesla Model 3 (standard range): 50 kWh = 180000000 J
One cycle of a washing machine: 0.5 kWh = 1800000 J

Common Mistakes to Avoid

Calorie confusion: Food 'Calories' are actually kilocalories (kcal).
Joule scale: 1 kWh is 3.6 million Joules (orders of magnitude difference).
Power vs Energy: mixing up Watts (power) and Watt-hours (energy).

Pro Tips

Food labels: Learn to read kcal; average adult needs ~2000 kcal/day.
Battery capacity: Wh = V * Ah. Useful for comparing different voltage batteries.
Efficiency: Energy cannot be created/destroyed, only converted (with some loss as heat).

What is a Kilowatt-hour?

The kilowatt-hour (kWh) is a unit of energy equal to 3.6 megajoules. It represents the energy consumed by a 1,000-watt appliance running for one hour.

Kilowatt-hours are the standard unit for electricity billing worldwide. It measures residential and industrial electrical energy consumption.

What is a Joule?

The joule (J) is the SI derived unit of energy. Defined as the work done by a force of one newton displacing an object by one meter.

Joules are used in science and engineering to measure work, energy, and heat. In nutrition, kilojoules (kJ) are used in many countries instead of calories.

Kilowatt-hours → Joules

Kilowatt-hours to Joules Formula