A watt-hour is 3,600 joules.
Watt-hours to Centijoules Converter — Wh to cJ
Convert Watt-hour (Wh) to Centijoule (cJ) using the exact conversion factor (1 watt-hour = 360,000 centijoule). See the formula, worked examples, conversion table, and common uses.
Watt-hours to Centijoules converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
Centijoule is 0.01 joule units.
Result = input x 3600 / 0.01.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Watt-hours to Centijoules
Watt-hour and Centijoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Watt-hour is most often used for phone, laptop, and power-bank battery capacity ratings.
Formula
centijoules = watt-hours × 360000
This factor comes from each unit's defined relationship to the category's base unit: 1 watt-hour equals 3600 base units, and 1 centijoule equals 0.01 base units, so dividing one by the other gives the direct watt-hour-to-centijoule factor of 360000.
Simple example
1 Wh × 360000 = 360,000 cJ
1 watt-hour = 360,000 centijoules.
Real-world example
100 Wh × 360000 = 36,000,000 cJ
100 watt-hours = 36,000,000 centijoules.
Conversion table
| Watt-hour (Wh) | Centijoule (cJ) |
|---|---|
| 1 Wh | 360,000 cJ |
| 10 Wh | 3,600,000 cJ |
| 100 Wh | 36,000,000 cJ |
| 500 Wh | 180,000,000 cJ |
| 1,000 Wh | 360,000,000 cJ |
| 2,000 Wh | 720,000,000 cJ |
Reverse conversion: Centijoule to Watt-hour
1 cJ × 0.000002777777778 = 0.0000027778 Wh
1 centijoule = 0.0000027778 watt-hours.
watt-hours = centijoules × 0.00000277777777778
For a page dedicated to this direction, see Centijoule to Watt-hour.
Understanding the Watt-hour
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
Where it's used: Universal — standard consumer-electronics and battery energy unit worldwide
Wh vs. kWh. The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.
Uses of the Watt-hour today
- Phone, laptop, and power-bank battery capacity ratings
- Electric-vehicle battery capacity specifications
- Small-scale renewable energy (solar panel) output ratings
Understanding the Centijoule (cJ)
Centijoule is 0.01 joule units.
Watt-hour — sources
- BIPM SI Brochure — Watt-hour as a common energy unit derived from the coherent SI units watt and second (via the hour).
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centijoules are in 1 watt-hour?
1 watt-hour equals 360,000 centijoules, using the exact defined conversion factor rather than an estimate.
How do I convert watt-hour to centijoule?
Multiply the watt-hour value by 360000. The converter above does this instantly to whatever precision you set.
How do I convert centijoule back to watt-hour?
Use the reverse factor: 1 centijoule equals 0.0000027778 watt-hours. You can also use the swap control in the converter above to flip the direction instantly.
What is a watt-hour?
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
What is a centijoule?
Centijoule (cJ) is a unit of energy.
Is the watt-hour to centijoule conversion exact?
Yes. Both watt-hour and centijoule are defined by fixed standards rather than physical artifacts, so the factor of 360000 used above is exact to as many digits as you choose to display.
What is the difference between wh vs. kwh?
The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.
Where is the watt-hour still used today?
Universal — standard consumer-electronics and battery energy unit worldwide