Picojoule is 1e-12 joule units.
Picojoules to Watt-hours Converter — pJ to Wh
Convert Picojoule (pJ) to Watt-hour (Wh) using the exact conversion factor (1 picojoule = 2.777778e-16 watt-hour). See the formula, worked examples, conversion table, and common uses.
Picojoules 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 1e-12 / 3600.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Picojoules to Watt-hours
Picojoule and Watt-hour both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Picojoule is 1e-12 joule units, and a watt-hour is 3,600 joules.
Formula
watt-hours = picojoules × 2.777778e-16
This factor comes from each unit's defined relationship to the category's base unit: 1 picojoule equals 1e-12 base units, and 1 watt-hour equals 3600 base units, so dividing one by the other gives the direct picojoule-to-watt-hour factor of 2.777778e-16.
Simple example
1 pJ × 2.777778e-16 = 2.777778e-16 Wh
1 picojoule = 2.777778e-16 watt-hours.
Real-world example
100 pJ × 2.777778e-16 = 2.777778e-14 Wh
100 picojoules = 2.777778e-14 watt-hours.
Conversion table
| Picojoule (pJ) | Watt-hour (Wh) |
|---|---|
| 1 pJ | 2.777778e-16 Wh |
| 10 pJ | 2.777778e-15 Wh |
| 100 pJ | 2.777778e-14 Wh |
| 500 pJ | 1.388889e-13 Wh |
| 1,000 pJ | 2.777778e-13 Wh |
| 2,000 pJ | 5.555556e-13 Wh |
Reverse conversion: Watt-hour to Picojoule
2.777778e-16 Wh × 3.6e+15 = 1.00000008 pJ
2.777778e-16 watt-hours = 1.00000008 picojoules.
picojoules = watt-hours × 3.6e+15
For a page dedicated to this direction, see Watt-hour to Picojoule.
Understanding the Picojoule (pJ)
Picojoule is 1e-12 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 picojoule?
1 picojoule equals 2.777778e-16 watt-hours, using the exact defined conversion factor rather than an estimate.
How do I convert picojoule to watt-hour?
Multiply the picojoule value by 2.777778e-16. The converter above does this instantly to whatever precision you set.
How do I convert watt-hour back to picojoule?
Use the reverse factor: 1 watt-hour equals 3.6e+15 picojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a picojoule?
Picojoule (pJ) 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 picojoule to watt-hour conversion exact?
Yes. Both picojoule and watt-hour are defined by fixed standards rather than physical artifacts, so the factor of 2.777778e-16 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.