Wh to kWh Converter

How to convert watt-hours to kilowatt-hours

FormulakWh = Wh × 0.001

Multiply the value in watt-hours by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).

A watt-hour is smaller than a kilowatt-hour: it takes 1,000 watt-hours to make one kilowatt-hour.

Worked examples

1 watt-hour1 Wh × 0.001 = 0.001 kWh
5 watt-hours5 Wh × 0.001 = 0.005 kWh
10 watt-hours10 Wh × 0.001 = 0.01 kWh
20 watt-hours20 Wh × 0.001 = 0.02 kWh
100 watt-hours100 Wh × 0.001 = 0.1 kWh

Watt-hours to kilowatt-hours conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Watt-hours to kilowatt-hours: 0.1–10 Wh
Watt-hours (Wh)	Kilowatt-hours (kWh)
0.1 Wh	0.0001 kWh
0.25 Wh	0.00025 kWh
0.5 Wh	0.0005 kWh
1 Wh	0.001 kWh
2 Wh	0.002 kWh
3 Wh	0.003 kWh
4 Wh	0.004 kWh
5 Wh	0.005 kWh
6 Wh	0.006 kWh
7 Wh	0.007 kWh
8 Wh	0.008 kWh
9 Wh	0.009 kWh
10 Wh	0.01 kWh

Watt-hours to kilowatt-hours: 12–1,000 Wh
Watt-hours (Wh)	Kilowatt-hours (kWh)
12 Wh	0.012 kWh
15 Wh	0.015 kWh
20 Wh	0.02 kWh
25 Wh	0.025 kWh
30 Wh	0.03 kWh
40 Wh	0.04 kWh
50 Wh	0.05 kWh
75 Wh	0.075 kWh
100 Wh	0.1 kWh
250 Wh	0.25 kWh
500 Wh	0.5 kWh
1,000 Wh	1 kWh

About the units

Watt-hour (Wh)

One watt sustained for an hour: 3,600 J. Battery capacities are rated in Wh.

Kilowatt-hour (kWh)

Exactly 3.6 MJ. The unit on electricity bills; running a 1,000 W heater for an hour uses 1 kWh. One kilowatt-hour equals 3,600,000 joules (J).

Frequently asked questions

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

There are 0.001 kilowatt-hours in one watt-hour, and this value is exact by definition.

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

Multiply the number of watt-hours by 0.001. For example, 10 Wh × 0.001 = 0.01 kWh.

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

One kilowatt-hour equals 1,000 watt-hours. That is the reverse factor, 1 ÷ 0.001.

What is 10 watt-hours in kilowatt-hours?

10 Wh = 0.01 kWh.

Is this Wh to kWh converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.