A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Kilowatt hours to Ronnajoules
Convert Kilowatt-hour (kWh) to Ronnajoule (RJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilowatt hours (kWh) to ronnajoules (RJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
RJ = kWh × 3.600000000e-21
Results update instantly for Kilowatt hours to Ronnajoules conversions.
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Formula
RJ = kWh × 3.600000000e-21
kWh = RJ × 2.777777778e+20
Conversion table
| 1 kWh | 3.600000e-21 RJ |
| 5 kWh | 1.800000e-20 RJ |
| 10 kWh | 3.600000e-20 RJ |
| 20 kWh | 7.200000e-20 RJ |
| 50 kWh | 1.800000e-19 RJ |
| 100 kWh | 3.600000e-19 RJ |
| 500 kWh | 1.800000e-18 RJ |
| 1000 kWh | 3.600000e-18 RJ |
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How the formula works
Both kilowatt-hour and ronnajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilowatt hours by 3.600000000e-21 to get ronnajoules. To reverse the conversion, multiply a ronnajoule value by 2.777777778e+20 to get back to kilowatt hours.
Frequently asked questions
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.
What is Ronnajoule (RJ)?
A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
How do I convert kilowatt hours to ronnajoules?
Multiply the kilowatt-hour value by 3.600000000e-21 to get the equivalent in ronnajoules. For example, 5 kWh × 3.600000000e-21 = 1.800000e-20 RJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.600000000e-21 is an exact, non-rounded value.
Can I convert ronnajoules back to kilowatt hours?
Yes. Divide the ronnajoule value by 3.600000000e-21, or multiply it by 2.777777778e+20, to get kilowatt hours.
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About converting kilowatt hours to ronnajoules
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour. A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
Use this calculator to move between kilowatt hours and ronnajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.