Convert watt-hours to kilowatt-hours

1 Wh=0.001kWh

Use the converter below to change any watt-hours value into kilowatt-hours instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.001

Conversion formula

Forward

kilowatt-hours = watt-hours × 0.001

Reverse

watt-hours = kilowatt-hours × 1,000

Example: 10 Wh × 0.001 = 0.01 kWh.

About both units

From

Watt-Hour

The watt-hour equals 3600 joules — 1 W delivered for 1 hour. Used for phone, laptop and small-battery capacities. A typical smartphone battery is 10–20 Wh; a laptop is 50–100 Wh.

Real-world: iPhone battery: 12 Wh. MacBook Pro: 70 Wh. Power bank: 20 Wh–100 Wh. Airplane carry-on limit: usually 100 Wh.

Read full watt-hour reference →

Kilowatt-Hour

kWh

The kilowatt-hour equals 3.6 megajoules — energy delivered by 1 kW for 1 hour. It is the standard unit on electricity bills worldwide. A UK home uses about 2900 kWh/year; an EV charge adds 10–80 kWh depending on battery.

Real-world: UK home: ~2900 kWh/year. Tesla Model 3 battery: 60–80 kWh. Typical EV efficiency: 15–20 kWh/100 km.

Read full kilowatt-hour reference →

Watt-Hour to Kilowatt-Hour conversion table

Common watt-hours to kilowatt-hours values for quick reference.

Watt-Hour (Wh)	Kilowatt-Hour (kWh)
1 Wh	0.001 kWh
10 Wh	0.01 kWh
100 Wh	0.1 kWh
500 Wh	0.5 kWh
1,000 Wh	1 kWh
5,000 Wh	5 kWh
10,000 Wh	10 kWh
50,000 Wh	50 kWh
100,000 Wh	100 kWh
500,000 Wh	500 kWh

Tips & common mistakes

Quick tips

1 Wh = 3600 J = 0.001 kWh.
Battery mAh × V = Wh. A 3000 mAh phone battery at 3.7 V = 11.1 Wh.
Airline limits lithium batteries to 100 Wh for carry-on.

Avoid these

Confusing mAh with Wh — need voltage to convert.
Using Wh when kWh is more appropriate for large batteries.
Forgetting the voltage in battery capacity calculations.

Frequently asked questions

How many kilowatt-hours in a watt-hour?

One watt-hour equals 0.001 kilowatt-hours.

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

Multiply the watt-hour value by 0.001 to get the equivalent in kilowatt-hours.

What is 100 watt-hours in kilowatt-hours?

100 watt-hours equals 0.1 kilowatt-hours.

Is a watt-hour bigger than a kilowatt-hour?

No. 1 watt-hour equals 0.001 kilowatt-hours, so one watt-hour is smaller.

How to convert watt-hours to kilowatt-hours without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

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