Decajoule is 10 joule units.
Decajoules to Watt-hours Converter — daJ to Wh
Convert Decajoule (daJ) to Watt-hour (Wh) using the exact conversion factor (1 decajoule = 0.0027777778 watt-hour). See the formula, worked examples, conversion table, and common uses.
Decajoules 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 10 / 3600.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Decajoules to Watt-hours
Decajoule and Watt-hour both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Decajoule is 10 joule units, and a watt-hour is 3,600 joules.
Formula
watt-hours = decajoules × 0.00277777777778
This factor comes from each unit's defined relationship to the category's base unit: 1 decajoule equals 10 base units, and 1 watt-hour equals 3600 base units, so dividing one by the other gives the direct decajoule-to-watt-hour factor of 0.00277777777778.
Simple example
1 daJ × 0.002777777778 = 0.0027777778 Wh
1 decajoule = 0.0027777778 watt-hours.
Real-world example
100 daJ × 0.002777777778 = 0.2777777778 Wh
100 decajoules = 0.2777777778 watt-hours.
Conversion table
| Decajoule (daJ) | Watt-hour (Wh) |
|---|---|
| 1 daJ | 0.0027777778 Wh |
| 10 daJ | 0.0277777778 Wh |
| 100 daJ | 0.2777777778 Wh |
| 500 daJ | 1.388888889 Wh |
| 1,000 daJ | 2.777777778 Wh |
| 2,000 daJ | 5.555555556 Wh |
Reverse conversion: Watt-hour to Decajoule
0.0027777778 Wh × 360 = 1.000000008 daJ
0.0027777778 watt-hours = 1.000000008 decajoules.
decajoules = watt-hours × 360
For a page dedicated to this direction, see Watt-hour to Decajoule.
Understanding the Decajoule (daJ)
Decajoule is 10 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 decajoule?
1 decajoule equals 0.0027777778 watt-hours, using the exact defined conversion factor rather than an estimate.
How do I convert decajoule to watt-hour?
Multiply the decajoule value by 0.002777777778. The converter above does this instantly to whatever precision you set.
How do I convert watt-hour back to decajoule?
Use the reverse factor: 1 watt-hour equals 360 decajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a decajoule?
Decajoule (daJ) 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 decajoule to watt-hour conversion exact?
Yes. Both decajoule and watt-hour are defined by fixed standards rather than physical artifacts, so the factor of 0.002777777778 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.