Edit either value. Decimals and scientific notation supported.
1
kWh
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JouleJ
KilojoulekJ
MegajouleMJ
Watt-hourWh
Kilowatt-hourkWh
Thermochemical caloriecal
Kilocalorie (food Calorie)kcal
BTU (international table)BTU (IT)
ElectronvolteV
No units found. Try a name or symbol.
3600000
J
esc
JouleJ
KilojoulekJ
MegajouleMJ
Watt-hourWh
Kilowatt-hourkWh
Thermochemical caloriecal
Kilocalorie (food Calorie)kcal
BTU (international table)BTU (IT)
ElectronvolteV
No units found. Try a name or symbol.
CONVERSION
1 kWh ≈ 3600000 J
6 significant figures
10 significant figures
15 significant figures
Precision changes displayed rounding, not calculation accuracy.
FORMULAJ = kWh × 3600000
FORMULA & EXAMPLES
How to convert Kilowatt-hours to joules
J = kWh × 3600000
Multiply the kWh reading by 3600000.
Worked examples
1 kWh ≈ 3600000 J
1 × 3600000 ≈ 3600000
10 kWh ≈ 36000000 J
10 × 3600000 ≈ 36000000
Frequently asked questions
Is a watt-hour the same quantity as a watt?
No. A watt-hour measures energy; a watt measures power. One watt-hour is the energy transferred at one watt for one hour, equal to 3,600 joules.
Kilowatt-hours to joules table
Fixed reference · Kilowatt-hour to Joule
Reference values use this page’s named pair and default context. Calculator precision and font settings do not change this table.
Kilowatt-hour (kWh)
Joule (J)
0
0
0.1
360000
0.5
1800000
1
3600000
2
7200000
5
18000000
10
36000000
25
90000000
50
180000000
100
360000000
1000
3600000000
Table results use 10 significant figures; decimal formula coefficients use up to 15. Calculations use the unit definitions before rounding. Extra digits do not improve measurement accuracy.