A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Watt hours to Petajoules
Convert Watt-hour (Wh) to Petajoule (PJ) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to petajoules (PJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
PJ = Wh × 3.600000000e-12
Results update instantly for Watt hours to Petajoules conversions.
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Formula
PJ = Wh × 3.600000000e-12
Wh = PJ × 277777777778
Conversion table
| 1 Wh | 3.600000e-12 PJ |
| 5 Wh | 1.800000e-11 PJ |
| 10 Wh | 3.600000e-11 PJ |
| 20 Wh | 7.200000e-11 PJ |
| 50 Wh | 1.800000e-10 PJ |
| 100 Wh | 3.600000e-10 PJ |
| 500 Wh | 1.800000e-09 PJ |
| 1000 Wh | 3.600000e-09 PJ |
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How the formula works
Both watt-hour and petajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 3.600000000e-12 to get petajoules. To reverse the conversion, multiply a petajoule value by 277777777778 to get back to watt hours.
Frequently asked questions
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
What is Petajoule (PJ)?
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
How do I convert watt hours to petajoules?
Multiply the watt-hour value by 3.600000000e-12 to get the equivalent in petajoules. For example, 5 Wh × 3.600000000e-12 = 1.800000e-11 PJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.600000000e-12 is an exact, non-rounded value.
Can I convert petajoules back to watt hours?
Yes. Divide the petajoule value by 3.600000000e-12, or multiply it by 277777777778, to get watt hours.
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About converting watt hours to petajoules
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Use this calculator to move between watt hours and petajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.