Energy conversion

Convert Joule to Kilowatt-hour

1 joule (J) equals 0.000000277778 kilowatt-hour (kWh). Enter any value below to convert from J to kWh.

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1 J = 0.0000002778 kWh

All Energy units

From 1 J
UnitValue
Joule J 1
Kilojoule kJ 0.001
Thermochemical calorie cal 0.2390057361
Kilocalorie kcal 0.0002390057
Watt-hour Wh 0.0002777778
Kilowatt-hour kWh 0.0000002778
BTU (International Table) BTUₕᵀ 0.0009478171
Foot-pound ft·lb 0.7375621493
Electronvolt eV 6.2415090745e18
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Formula

J to kWh conversion formula

Use this relationship for a direct conversion:

kWh = J x 0.000000277778

Worked example

2 J = 0.0000005556 kWh.

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

Quick reference

Joule to Kilowatt-hour table

Joule (J)Kilowatt-hour (kWh)
0.010.0000000028
0.10.0000000278
10.0000002778
20.0000005556
50.0000013889
100.0000027778
250.0000069444
500.0000138889
1000.0000277778
1,0000.0002777778

From unit

About the joule

The SI unit of energy, equal to one newton meter.

Symbol: J

To unit

About the kilowatt-hour

One thousand watt-hours.

Symbol: kWh

Keep converting

Related conversions

Kilowatt-hour to JouleReverse this conversion Joule to KilojouleJ to kJJoule to Thermochemical calorieJ to calJoule to KilocalorieJ to kcalJoule to Watt-hourJ to WhJoule to BTU (International Table)J to BTUₕᵀJoule to Foot-poundJ 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

J to kWh FAQ

How do you convert joule to kilowatt-hour?

Use the formula kWh = J x 0.000000277778. 1 joule (J) equals 0.000000277778 kilowatt-hour (kWh).

Is the J to kWh conversion exact?

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