Watt-Hour (W·h)
A watt-hour is the energy from one watt of power sustained for one hour — 3,600 joules.
Watt-hours size phone batteries, power banks, and small rechargeable devices.
Watt-Hour to Joule
Convert watt-hour to joule instantly. Type in either field — results update live.
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Energy Watt-Hour Joule
1 watt-hour = 3,600 joules
Unit
Unit
Conversion table
Selected W·h values converted to J using the exact factor from this tool.
| W·h | J |
|---|---|
| 0.01 | 36 |
| 0.1 | 360 |
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 5 | 18,000 |
| 10 | 36,000 |
| 20 | 72,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 1,000 | 3,600,000 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 W·h = 3600 J
1 J = 0.0002777778 W·h
To convert watt-hour to joule, multiply by 3600.
To convert joule to watt-hour, multiply by 0.0002777778.
Example: convert 10 W·h to J
10 × 3600 = 36000 J
About these units
Short background on the units used in this conversion.
Joule (J)
The joule is the SI unit of energy — the work done when one newton moves an object one meter.
Joules quantify electricity bills (as kWh), food energy (as kcal), and scientific energy transfers.
Frequently asked questions
How many joules are in one watt-hour?
One watt-hour equals 3,600 joules. Multiply your watt-hours value by 3,600 to convert to joules.
What is the conversion formula?
J = W·h × 3,600The reverse is
W·h = J × 0.0002777778, using the same exact factors as this converter.Is this Watt-Hour to Joule converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All watt-hour conversions
Jump to any energy conversion starting from watt-hour — including the reverse direction and every other unit in our dataset.
joule (J) → watt-hour (W·h)
watt-hour (W·h) → kilojoule (kJ)watt-hour (W·h) → megajoule (MJ)watt-hour (W·h) → gigajoule (GJ)watt-hour (W·h) → kilowatt-hour (kW·h)watt-hour (W·h) → calorie (nutritional / food calorie) (Cal)watt-hour (W·h) → kilocalorie (it) (kcal (IT))watt-hour (W·h) → kilocalorie (thermochemical) (kcal (th))watt-hour (W·h) → calorie (it) (cal (IT))watt-hour (W·h) → calorie (thermochemical) (cal (th))watt-hour (W·h) → british thermal unit (it) (Btu (IT))watt-hour (W·h) → british thermal unit (thermochemical) (Btu (th))watt-hour (W·h) → foot-pound (ft·lbf)watt-hour (W·h) → newton meter (N·m)watt-hour (W·h) → horsepower hour (mechanical) (hp·h)watt-hour (W·h) → horsepower (metric) hour (metric hp·h)watt-hour (W·h) → millijoule (mJ)watt-hour (W·h) → microjoule (µJ)watt-hour (W·h) → nanojoule (nJ)watt-hour (W·h) → attojoule (aJ)watt-hour (W·h) → megaelectron-volt (MeV)watt-hour (W·h) → kiloelectron-volt (keV)watt-hour (W·h) → electron-volt (eV)watt-hour (W·h) → ergwatt-hour (W·h) → gigawatt-hour (GW·h)watt-hour (W·h) → megawatt-hour (MW·h)watt-hour (W·h) → kilowatt-second (kW·s)watt-hour (W·h) → watt-second (W·s)watt-hour (W·h) → mega british thermal unit (it) (MBtu (IT))watt-hour (W·h) → ton-hour (refrigeration) (ton·h)watt-hour (W·h) → fuel oil equivalent @ kiloliter (kL oil eq)watt-hour (W·h) → fuel oil equivalent @ barrel (us) (bbl oil eq)watt-hour (W·h) → gigaton (tnt) (Gton)watt-hour (W·h) → megaton (tnt) (Mton)watt-hour (W·h) → kiloton (tnt) (kton)watt-hour (W·h) → ton (explosives / tnt) (ton TNT)watt-hour (W·h) → dyne centimeter (dyn·cm)watt-hour (W·h) → gram-force meter (gf·m)watt-hour (W·h) → gram-force centimeter (gf·cm)watt-hour (W·h) → kilogram-force centimeter (kgf·cm)watt-hour (W·h) → kilogram-force meter (kgf·m)watt-hour (W·h) → kilopond meter (kp·m)watt-hour (W·h) → pound-force foot (lbf·ft)watt-hour (W·h) → pound-force inch (lbf·in)watt-hour (W·h) → ounce-force inch (ozf·in)watt-hour (W·h) → inch-pound (in·lbf)watt-hour (W·h) → inch-ounce (in·ozf)watt-hour (W·h) → poundal foot (pdl·ft)watt-hour (W·h) → thermwatt-hour (W·h) → therm (ec)watt-hour (W·h) → therm (us)watt-hour (W·h) → hartree energy (Eh)watt-hour (W·h) → rydberg constant (Ry)