A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
Terajoules to Watt hours
Convert Terajoule (TJ) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert terajoules (TJ) 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 = TJ × 277777777.8
Results update instantly for Terajoules to Watt hours conversions.
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Formula
Wh = TJ × 277777777.8
TJ = Wh × 3.600000000e-09
Conversion table
| 1 TJ | 2.777778e+08 Wh |
| 5 TJ | 1.388889e+09 Wh |
| 10 TJ | 2.777778e+09 Wh |
| 20 TJ | 5.555556e+09 Wh |
| 50 TJ | 1.388889e+10 Wh |
| 100 TJ | 2.777778e+10 Wh |
| 500 TJ | 1.388889e+11 Wh |
| 1000 TJ | 2.777778e+11 Wh |
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How the formula works
Both terajoule and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in terajoules by 277777777.8 to get watt hours. To reverse the conversion, multiply a watt-hour value by 3.600000000e-09 to get back to terajoules.
Frequently asked questions
What is Terajoule (TJ)?
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
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 terajoules to watt hours?
Multiply the terajoule value by 277777777.8 to get the equivalent in watt hours. For example, 5 TJ × 277777777.8 = 1.388889e+09 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 277777777.8 is an exact, non-rounded value.
Can I convert watt hours back to terajoules?
Yes. Divide the watt-hour value by 277777777.8, or multiply it by 3.600000000e-09, to get terajoules.
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About converting terajoules to watt hours
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix. 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 terajoules 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.