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 Yoctojoules
Convert Watt-hour (Wh) to Yoctojoule (yJ) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to yoctojoules (yJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
yJ = Wh × 3.600000000e+27
Results update instantly for Watt hours to Yoctojoules conversions.
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Formula
yJ = Wh × 3.600000000e+27
Wh = yJ × 2.777777778e-28
Conversion table
| 1 Wh | 3.600000e+27 yJ |
| 5 Wh | 1.800000e+28 yJ |
| 10 Wh | 3.600000e+28 yJ |
| 20 Wh | 7.200000e+28 yJ |
| 50 Wh | 1.800000e+29 yJ |
| 100 Wh | 3.600000e+29 yJ |
| 500 Wh | 1.800000e+30 yJ |
| 1000 Wh | 3.600000e+30 yJ |
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How the formula works
Both watt-hour and yoctojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 3.600000000e+27 to get yoctojoules. To reverse the conversion, multiply a yoctojoule value by 2.777777778e-28 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 Yoctojoule (yJ)?
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
How do I convert watt hours to yoctojoules?
Multiply the watt-hour value by 3.600000000e+27 to get the equivalent in yoctojoules. For example, 5 Wh × 3.600000000e+27 = 1.800000e+28 yJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.600000000e+27 is an exact, non-rounded value.
Can I convert yoctojoules back to watt hours?
Yes. Divide the yoctojoule value by 3.600000000e+27, or multiply it by 2.777777778e-28, to get watt hours.
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About converting watt hours to yoctojoules
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
Use this calculator to move between watt hours and yoctojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.