Centijoule is 0.01 joule units.
Centijoules to Watt-hours Converter — cJ to Wh
Convert Centijoule (cJ) to Watt-hour (Wh) using the exact conversion factor (1 centijoule = 0.0000027778 watt-hour). See the formula, worked examples, conversion table, and common uses.
Centijoules to Watt-hours 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.
A watt-hour is 3,600 joules.
Result = input x 0.01 / 3600.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Centijoules to Watt-hours
Centijoule and Watt-hour both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Centijoule is 0.01 joule units, and a watt-hour is 3,600 joules.
Formula
watt-hours = centijoules × 0.00000277777777778
This factor comes from each unit's defined relationship to the category's base unit: 1 centijoule equals 0.01 base units, and 1 watt-hour equals 3600 base units, so dividing one by the other gives the direct centijoule-to-watt-hour factor of 0.00000277777777778.
Simple example
1 cJ × 0.000002777777778 = 0.0000027778 Wh
1 centijoule = 0.0000027778 watt-hours.
Real-world example
100 cJ × 0.000002777777778 = 0.0002777778 Wh
100 centijoules = 0.0002777778 watt-hours.
Conversion table
| Centijoule (cJ) | Watt-hour (Wh) |
|---|---|
| 1 cJ | 0.0000027778 Wh |
| 10 cJ | 0.0000277778 Wh |
| 100 cJ | 0.0002777778 Wh |
| 500 cJ | 0.0013888889 Wh |
| 1,000 cJ | 0.0027777778 Wh |
| 2,000 cJ | 0.0055555556 Wh |
Reverse conversion: Watt-hour to Centijoule
0.0000027778 Wh × 360000 = 1.000008 cJ
0.0000027778 watt-hours = 1.000008 centijoules.
centijoules = watt-hours × 360000
For a page dedicated to this direction, see Watt-hour to Centijoule.
Understanding the Centijoule (cJ)
Centijoule is 0.01 joule units.
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
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 watt-hours are in 1 centijoule?
1 centijoule equals 0.0000027778 watt-hours, using the exact defined conversion factor rather than an estimate.
How do I convert centijoule to watt-hour?
Multiply the centijoule value by 0.000002777777778. The converter above does this instantly to whatever precision you set.
How do I convert watt-hour back to centijoule?
Use the reverse factor: 1 watt-hour equals 360,000 centijoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a centijoule?
Centijoule (cJ) is a unit of energy.
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.
Is the centijoule to watt-hour conversion exact?
Yes. Both centijoule and watt-hour are defined by fixed standards rather than physical artifacts, so the factor of 0.000002777777778 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.