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

J → kWh Reference Table

J	kWh
0.001 J	2.777778e-10 kWh
0.002 J	5.555556e-10 kWh
0.003 J	8.333333e-10 kWh
0.004 J	1.111111e-9 kWh
0.005 J	1.388889e-9 kWh
0.006 J	1.666667e-9 kWh
0.007 J	1.944444e-9 kWh
0.008 J	2.222222e-9 kWh
0.009 J	2.500000e-9 kWh
0.01 J	2.777778e-9 kWh
0.02 J	5.555556e-9 kWh
0.03 J	8.333333e-9 kWh
0.04 J	1.111111111e-8 kWh
0.05 J	1.388888889e-8 kWh
0.06 J	1.666666667e-8 kWh
0.07 J	1.944444444e-8 kWh
0.08 J	2.222222222e-8 kWh
0.09 J	2.5e-8 kWh
0.1 J	2.777777778e-8 kWh
0.2 J	5.555555556e-8 kWh
0.3 J	8.333333333e-8 kWh
0.4 J	1.111111111e-7 kWh
0.5 J	1.388888889e-7 kWh
0.6 J	1.666666667e-7 kWh
0.7 J	1.944444444e-7 kWh
0.8 J	2.222222222e-7 kWh
0.9 J	2.5e-7 kWh
1 J	2.777777778e-7 kWh
1.5 J	4.166666667e-7 kWh
2 J	5.555555556e-7 kWh
2.5 J	6.944444444e-7 kWh
3 J	8.333333333e-7 kWh
3.5 J	9.722222222e-7 kWh
4 J	0.000001111111111 kWh
4.5 J	0.00000125 kWh
5 J	0.000001388888889 kWh
5.5 J	0.000001527777778 kWh
6 J	0.000001666666667 kWh
6.5 J	0.000001805555556 kWh
7 J	0.000001944444444 kWh
7.5 J	0.000002083333333 kWh
8 J	0.000002222222222 kWh
8.5 J	0.000002361111111 kWh
9 J	0.0000025 kWh
9.5 J	0.000002638888889 kWh
10 J	0.000002777777778 kWh
11 J	0.000003055555556 kWh
12 J	0.000003333333333 kWh
13 J	0.000003611111111 kWh
14 J	0.000003888888889 kWh
15 J	0.000004166666667 kWh
16 J	0.000004444444444 kWh
17 J	0.000004722222222 kWh
18 J	0.000005 kWh
19 J	0.000005277777778 kWh
20 J	0.000005555555556 kWh
25 J	0.000006944444444 kWh
30 J	0.000008333333333 kWh
35 J	0.000009722222222 kWh
40 J	0.00001111111111 kWh
45 J	0.0000125 kWh
50 J	0.00001388888889 kWh
55 J	0.00001527777778 kWh
60 J	0.00001666666667 kWh
65 J	0.00001805555556 kWh
70 J	0.00001944444444 kWh
75 J	0.00002083333333 kWh
80 J	0.00002222222222 kWh
85 J	0.00002361111111 kWh
90 J	0.000025 kWh
95 J	0.00002638888889 kWh
100 J	0.00002777777778 kWh
120 J	0.00003333333333 kWh
125 J	0.00003472222222 kWh
130 J	0.00003611111111 kWh
140 J	0.00003888888889 kWh
150 J	0.00004166666667 kWh
160 J	0.00004444444444 kWh
175 J	0.00004861111111 kWh
180 J	0.00005 kWh
200 J	0.00005555555556 kWh
225 J	0.0000625 kWh
250 J	0.00006944444444 kWh
275 J	0.00007638888889 kWh
300 J	0.00008333333333 kWh
350 J	0.00009722222222 kWh
400 J	0.0001111111111 kWh
450 J	0.000125 kWh
500 J	0.0001388888889 kWh
600 J	0.0001666666667 kWh
700 J	0.0001944444444 kWh
750 J	0.0002083333333 kWh
800 J	0.0002222222222 kWh
900 J	0.00025 kWh
1000 J	0.0002777777778 kWh
1200 J	0.0003333333333 kWh
1250 J	0.0003472222222 kWh
1500 J	0.0004166666667 kWh
1750 J	0.0004861111111 kWh
2000 J	0.0005555555556 kWh
2500 J	0.0006944444444 kWh
3000 J	0.0008333333333 kWh
4000 J	0.001111111111 kWh
4500 J	0.00125 kWh
5000 J	0.001388888889 kWh
6000 J	0.001666666667 kWh
7000 J	0.001944444444 kWh
7500 J	0.002083333333 kWh
8000 J	0.002222222222 kWh
9000 J	0.0025 kWh
10000 J	0.002777777778 kWh
15000 J	0.004166666667 kWh
20000 J	0.005555555556 kWh
25000 J	0.006944444444 kWh
50000 J	0.01388888889 kWh
75000 J	0.02083333333 kWh
100000 J	0.02777777778 kWh

Values based on NIST SP 811 conversion factors

Why Convert Joules to Kilowatt-hours?

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

Energy conversions from J to kWh 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 Joules to Kilowatt-hours

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

kWh = J × 2.777777778e-7

Example: 1 J = 2.777777778e-7 kWh

For example, 5 J = 0.000001388888889 kWh, 10 J = 0.000002777777778 kWh, and 100 J = 0.00002777777778 kWh. For larger values, 1000 J = 0.0002777777778 kWh. Conversely, 1 kWh = 3600000 J. Our calculator above performs this conversion instantly with full precision — no rounding errors.

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 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.

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.

Frequently Asked Questions

How many kilowatt-hours are in 1 joule?

1 J equals 2.777777778e-7 kWh. This is an exact conversion factor defined by NIST.

How do I convert joules to kilowatt-hours?

Multiply the value in J by the conversion factor. For example, 10 J = 0.000002777777778 kWh. Use our calculator above for instant results.

Is the joules to kilowatt-hours conversion exact?

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

Can I convert joules to kilowatt-hours 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 joules and kilowatt-hours?

Joules (J) and Kilowatt-hours (kWh) are both units of energy but belong to different measurement systems. 1 J = 2.777777778e-7 kWh. Use the converter above to switch between them instantly.

Joules → Kilowatt-hours