Energy conversion

Convert Watt-hour to Kilowatt-hour

1 watt-hour (Wh) equals 0.001 kilowatt-hour (kWh). Enter any value below to convert from Wh to kWh.

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1 Wh = 0.001 kWh

All Energy units

From 1 Wh
UnitValue
Joule J 3,600
Kilojoule kJ 3.6
Thermochemical calorie cal 860.4206500956
Kilocalorie kcal 0.8604206501
Watt-hour Wh 1
Kilowatt-hour kWh 0.001
BTU (International Table) BTUₕᵀ 3.4121416331
Foot-pound ft·lb 2,655.2237373982
Electronvolt eV 2.2469432668e22
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Formula

Wh to kWh conversion formula

Use this relationship for a direct conversion:

kWh = Wh x 0.001

Worked example

2 Wh = 0.002 kWh.

The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.

Quick reference

Watt-hour to Kilowatt-hour table

Watt-hour (Wh)Kilowatt-hour (kWh)
0.010.00001
0.10.0001
10.001
20.002
50.005
100.01
250.025
500.05
1000.1
1,0001

From unit

About the watt-hour

The energy from one watt sustained for one hour.

Symbol: Wh

To unit

About the kilowatt-hour

One thousand watt-hours.

Symbol: kWh

Keep converting

Related conversions

Kilowatt-hour to Watt-hourReverse this conversion Watt-hour to JouleWh to JWatt-hour to KilojouleWh to kJWatt-hour to Thermochemical calorieWh to calWatt-hour to KilocalorieWh to kcalWatt-hour to BTU (International Table)Wh to BTUₕᵀWatt-hour to Foot-poundWh to ft·lb

Source

Conversion standard

Definitions are checked against NIST SP 811: Energy units. Calculations use full internal precision before display rounding.

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Questions

Wh to kWh FAQ

How do you convert watt-hour to kilowatt-hour?

Use the formula kWh = Wh x 0.001. 1 watt-hour (Wh) equals 0.001 kilowatt-hour (kWh).

Is the Wh to kWh conversion exact?

Both unit definitions use exact factors. Only the displayed decimal may be rounded.