A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
Attojoules to Kilowatt hours
Convert Attojoule (aJ) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert attojoules (aJ) to kilowatt hours (kWh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
kWh = aJ × 2.777777778e-25
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Formula
kWh = aJ × 2.777777778e-25
aJ = kWh × 3.600000000e+24
Conversion table
| 1 aJ | 2.777778e-25 kWh |
| 5 aJ | 1.388889e-24 kWh |
| 10 aJ | 2.777778e-24 kWh |
| 20 aJ | 5.555556e-24 kWh |
| 50 aJ | 1.388889e-23 kWh |
| 100 aJ | 2.777778e-23 kWh |
| 500 aJ | 1.388889e-22 kWh |
| 1000 aJ | 2.777778e-22 kWh |
Related conversions
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How the formula works
Both attojoule and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in attojoules by 2.777777778e-25 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 3.600000000e+24 to get back to attojoules.
Frequently asked questions
What is Attojoule (aJ)?
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
What is Kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
How do I convert attojoules to kilowatt hours?
Multiply the attojoule value by 2.777777778e-25 to get the equivalent in kilowatt hours. For example, 5 aJ × 2.777777778e-25 = 1.388889e-24 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.777777778e-25 is an exact, non-rounded value.
Can I convert kilowatt hours back to attojoules?
Yes. Divide the kilowatt-hour value by 2.777777778e-25, or multiply it by 3.600000000e+24, to get attojoules.
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About converting attojoules to kilowatt hours
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix. A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Use this calculator to move between attojoules and kilowatt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.