Convert kilowatt-hours to watt-hours

1 kWh=1,000Wh

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

You have

Equals

1,000

Conversion formula

Forward

watt-hours = kilowatt-hours × 1,000

Reverse

kilowatt-hours = watt-hours × 0.001

Example: 10 kWh × 1,000 = 10,000 Wh.

About both units

From

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

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 to Watt-Hour conversion table

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

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

Tips & common mistakes

Quick tips

1 kWh = 3.6 MJ = 3,600,000 J.
Multiply device power (kW) × time (h) = energy (kWh).
EV "range anxiety" translates to knowing kWh available.

Avoid these

Confusing kWh (energy) with kW (power).
Calculating electric costs by power ignoring duration.
Using "kWh/h" — redundant; it's just kW.

Frequently asked questions

How many watt-hours in a kilowatt-hour?

One kilowatt-hour equals 1,000 watt-hours.

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

Multiply the kilowatt-hour value by 1,000 to get the equivalent in watt-hours.

What is 100 kilowatt-hours in watt-hours?

100 kilowatt-hours equals 100,000 watt-hours.

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

Yes. 1 kilowatt-hour equals 1,000 watt-hours, so one kilowatt-hour is larger.

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

Multiply by 1,000 for a quick estimate; use a calculator for precise results.

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