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 Terajoules
Convert Watt-hour (Wh) to Terajoule (TJ) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to terajoules (TJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
TJ = Wh × 3.600000000e-09
Results update instantly for Watt hours to Terajoules conversions.
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Formula
TJ = Wh × 3.600000000e-09
Wh = TJ × 277777777.8
Conversion table
| 1 Wh | 3.600000e-09 TJ |
| 5 Wh | 1.800000e-08 TJ |
| 10 Wh | 3.600000e-08 TJ |
| 20 Wh | 7.200000e-08 TJ |
| 50 Wh | 1.800000e-07 TJ |
| 100 Wh | 3.600000e-07 TJ |
| 500 Wh | 0.000002 TJ |
| 1000 Wh | 0.000004 TJ |
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How the formula works
Both watt-hour and terajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 3.600000000e-09 to get terajoules. To reverse the conversion, multiply a terajoule value by 277777777.8 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 Terajoule (TJ)?
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
How do I convert watt hours to terajoules?
Multiply the watt-hour value by 3.600000000e-09 to get the equivalent in terajoules. For example, 5 Wh × 3.600000000e-09 = 1.800000e-08 TJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.600000000e-09 is an exact, non-rounded value.
Can I convert terajoules back to watt hours?
Yes. Divide the terajoule value by 3.600000000e-09, or multiply it by 277777777.8, to get watt hours.
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About converting watt hours to terajoules
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
Use this calculator to move between watt hours and terajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.