A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico prefix.
Picojoules to Watt hours
Convert Picojoule (pJ) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert picojoules (pJ) to watt hours (Wh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Wh = pJ × 2.777777778e-16
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Formula
Wh = pJ × 2.777777778e-16
pJ = Wh × 3.600000000e+15
Conversion table
| 1 pJ | 2.777778e-16 Wh |
| 5 pJ | 1.388889e-15 Wh |
| 10 pJ | 2.777778e-15 Wh |
| 20 pJ | 5.555556e-15 Wh |
| 50 pJ | 1.388889e-14 Wh |
| 100 pJ | 2.777778e-14 Wh |
| 500 pJ | 1.388889e-13 Wh |
| 1000 pJ | 2.777778e-13 Wh |
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How the formula works
Both picojoule and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in picojoules by 2.777777778e-16 to get watt hours. To reverse the conversion, multiply a watt-hour value by 3.600000000e+15 to get back to picojoules.
Frequently asked questions
What is Picojoule (pJ)?
A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico prefix.
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.
How do I convert picojoules to watt hours?
Multiply the picojoule value by 2.777777778e-16 to get the equivalent in watt hours. For example, 5 pJ × 2.777777778e-16 = 1.388889e-15 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.777777778e-16 is an exact, non-rounded value.
Can I convert watt hours back to picojoules?
Yes. Divide the watt-hour value by 2.777777778e-16, or multiply it by 3.600000000e+15, to get picojoules.
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About converting picojoules to watt hours
A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico prefix. A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Use this calculator to move between picojoules and watt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.