A watt-hour is 3,600 joules.
Watt-hours to Hectojoules Converter — Wh to hJ
Convert Watt-hour (Wh) to Hectojoule (hJ) using the exact conversion factor (1 watt-hour = 36 hectojoule). See the formula, worked examples, conversion table, and common uses.
Watt-hours to Hectojoules converter
Converter
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Context values
Some unit families need one extra value for a physically accurate result.
Hectojoule is 100 joule units.
Result = input x 3600 / 100.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Watt-hours to Hectojoules
Watt-hour and Hectojoule 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
hectojoules = watt-hours × 36
This factor comes from each unit's defined relationship to the category's base unit: 1 watt-hour equals 3600 base units, and 1 hectojoule equals 100 base units, so dividing one by the other gives the direct watt-hour-to-hectojoule factor of 36.
Simple example
1 Wh × 36 = 36 hJ
1 watt-hour = 36 hectojoules.
Real-world example
100 Wh × 36 = 3,600 hJ
100 watt-hours = 3,600 hectojoules.
Conversion table
| Watt-hour (Wh) | Hectojoule (hJ) |
|---|---|
| 1 Wh | 36 hJ |
| 10 Wh | 360 hJ |
| 100 Wh | 3,600 hJ |
| 500 Wh | 18,000 hJ |
| 1,000 Wh | 36,000 hJ |
| 2,000 Wh | 72,000 hJ |
Reverse conversion: Hectojoule to Watt-hour
36 hJ × 0.02777777778 = 1 Wh
36 hectojoules = 1 watt-hour.
watt-hours = hectojoules × 0.0277777777778
For a page dedicated to this direction, see Hectojoule 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 Hectojoule (hJ)
Hectojoule is 100 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 hectojoules are in 1 watt-hour?
1 watt-hour equals 36 hectojoules, using the exact defined conversion factor rather than an estimate.
How do I convert watt-hour to hectojoule?
Multiply the watt-hour value by 36. The converter above does this instantly to whatever precision you set.
How do I convert hectojoule back to watt-hour?
Use the reverse factor: 1 hectojoule equals 0.0277777778 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 hectojoule?
Hectojoule (hJ) is a unit of energy.
Is the watt-hour to hectojoule conversion exact?
Yes. Both watt-hour and hectojoule are defined by fixed standards rather than physical artifacts, so the factor of 36 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