How many kilowatt-hours are in 1 watt-hour?

1 Wh equals 0.001 kWh. This is an exact conversion factor defined by NIST.

How do I convert watt-hours to kilowatt-hours?

Multiply the value in Wh by the conversion factor. For example, 10 Wh = 0.01 kWh. Use our calculator above for instant results.

Is the watt-hours 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 watt-hours 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 watt-hours and kilowatt-hours?

Watt-hours (Wh) and Kilowatt-hours (kWh) are both units of energy but belong to different measurement systems. 1 Wh = 0.001 kWh. Use the converter above to switch between them instantly.

Watt-hours to Kilowatt-hours (Wh → kWh) — Free Online Converter

Wh → kWh Reference Table

Wh	kWh
0.001 Wh	0.000001 kWh
0.002 Wh	0.000002 kWh
0.003 Wh	0.000003 kWh
0.004 Wh	0.000004 kWh
0.005 Wh	0.000005 kWh
0.006 Wh	0.000006 kWh
0.007 Wh	0.000007 kWh
0.008 Wh	0.000008 kWh
0.009 Wh	0.000009 kWh
0.01 Wh	0.00001 kWh
0.02 Wh	0.00002 kWh
0.03 Wh	0.00003 kWh
0.04 Wh	0.00004 kWh
0.05 Wh	0.00005 kWh
0.06 Wh	0.00006 kWh
0.07 Wh	0.00007 kWh
0.08 Wh	0.00008 kWh
0.09 Wh	0.00009 kWh
0.1 Wh	0.0001 kWh
0.2 Wh	0.0002 kWh
0.3 Wh	0.0003 kWh
0.4 Wh	0.0004 kWh
0.5 Wh	0.0005 kWh
0.6 Wh	0.0006 kWh
0.7 Wh	0.0007 kWh
0.8 Wh	0.0008 kWh
0.9 Wh	0.0009 kWh
1 Wh	0.001 kWh
1.5 Wh	0.0015 kWh
2 Wh	0.002 kWh
2.5 Wh	0.0025 kWh
3 Wh	0.003 kWh
3.5 Wh	0.0035 kWh
4 Wh	0.004 kWh
4.5 Wh	0.0045 kWh
5 Wh	0.005 kWh
5.5 Wh	0.0055 kWh
6 Wh	0.006 kWh
6.5 Wh	0.0065 kWh
7 Wh	0.007 kWh
7.5 Wh	0.0075 kWh
8 Wh	0.008 kWh
8.5 Wh	0.0085 kWh
9 Wh	0.009 kWh
9.5 Wh	0.0095 kWh
10 Wh	0.01 kWh
11 Wh	0.011 kWh
12 Wh	0.012 kWh
13 Wh	0.013 kWh
14 Wh	0.014 kWh
15 Wh	0.015 kWh
16 Wh	0.016 kWh
17 Wh	0.017 kWh
18 Wh	0.018 kWh
19 Wh	0.019 kWh
20 Wh	0.02 kWh
25 Wh	0.025 kWh
30 Wh	0.03 kWh
35 Wh	0.035 kWh
40 Wh	0.04 kWh
45 Wh	0.045 kWh
50 Wh	0.05 kWh
55 Wh	0.055 kWh
60 Wh	0.06 kWh
65 Wh	0.065 kWh
70 Wh	0.07 kWh
75 Wh	0.075 kWh
80 Wh	0.08 kWh
85 Wh	0.085 kWh
90 Wh	0.09 kWh
95 Wh	0.095 kWh
100 Wh	0.1 kWh
120 Wh	0.12 kWh
125 Wh	0.125 kWh
130 Wh	0.13 kWh
140 Wh	0.14 kWh
150 Wh	0.15 kWh
160 Wh	0.16 kWh
175 Wh	0.175 kWh
180 Wh	0.18 kWh
200 Wh	0.2 kWh
225 Wh	0.225 kWh
250 Wh	0.25 kWh
275 Wh	0.275 kWh
300 Wh	0.3 kWh
350 Wh	0.35 kWh
400 Wh	0.4 kWh
450 Wh	0.45 kWh
500 Wh	0.5 kWh
600 Wh	0.6 kWh
700 Wh	0.7 kWh
750 Wh	0.75 kWh
800 Wh	0.8 kWh
900 Wh	0.9 kWh
1000 Wh	1 kWh
1200 Wh	1.2 kWh
1250 Wh	1.25 kWh
1500 Wh	1.5 kWh
1750 Wh	1.75 kWh
2000 Wh	2 kWh
2500 Wh	2.5 kWh
3000 Wh	3 kWh
4000 Wh	4 kWh
4500 Wh	4.5 kWh
5000 Wh	5 kWh
6000 Wh	6 kWh
7000 Wh	7 kWh
7500 Wh	7.5 kWh
8000 Wh	8 kWh
9000 Wh	9 kWh
10000 Wh	10 kWh
15000 Wh	15 kWh
20000 Wh	20 kWh
25000 Wh	25 kWh
50000 Wh	50 kWh
75000 Wh	75 kWh
100000 Wh	100 kWh

Values based on NIST SP 811 conversion factors

Why Convert Watt-hours to Kilowatt-hours?

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

Energy conversions from Wh 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 Watt-hours to Kilowatt-hours

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

kWh = Wh × 0.001

Example: 1 Wh = 0.001 kWh

For example, 5 Wh = 0.005 kWh, 10 Wh = 0.01 kWh, and 100 Wh = 0.1 kWh. For larger values, 1000 Wh = 1 kWh. Conversely, 1 kWh = 1000 Wh. 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 Watt-hour?

A unit of energy equivalent to one watt of power expended for one hour.

Used for battery capacity.

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.

Watt-hours → Kilowatt-hours

Watt-hours to Kilowatt-hours Formula