An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Ergs to Watt hours
Convert Erg (erg) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert ergs (erg) 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 = erg × 2.777777778e-11
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Formula
Wh = erg × 2.777777778e-11
erg = Wh × 36000000000
Conversion table
| 1 erg | 2.777778e-11 Wh |
| 5 erg | 1.388889e-10 Wh |
| 10 erg | 2.777778e-10 Wh |
| 20 erg | 5.555556e-10 Wh |
| 50 erg | 1.388889e-09 Wh |
| 100 erg | 2.777778e-09 Wh |
| 500 erg | 1.388889e-08 Wh |
| 1000 erg | 2.777778e-08 Wh |
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How the formula works
Both erg and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in ergs by 2.777777778e-11 to get watt hours. To reverse the conversion, multiply a watt-hour value by 36000000000 to get back to ergs.
Frequently asked questions
What is Erg (erg)?
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
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 ergs to watt hours?
Multiply the erg value by 2.777777778e-11 to get the equivalent in watt hours. For example, 5 erg × 2.777777778e-11 = 1.388889e-10 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.777777778e-11 is an exact, non-rounded value.
Can I convert watt hours back to ergs?
Yes. Divide the watt-hour value by 2.777777778e-11, or multiply it by 36000000000, to get ergs.
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About converting ergs to watt hours
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule. 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 ergs 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.