A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
Hectojoules to Joules
Convert Hectojoule (hJ) to Joule (J) instantly with an exact formula, conversion table, and FAQ.
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Convert hectojoules (hJ) to joules (J) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
J = hJ × 100
Results update instantly for Hectojoules to Joules conversions.
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Formula
J = hJ × 100
hJ = J × 0.01
Conversion table
| 1 hJ | 100 J |
| 5 hJ | 500 J |
| 10 hJ | 1000 J |
| 20 hJ | 2000 J |
| 50 hJ | 5000 J |
| 100 hJ | 10000 J |
| 500 hJ | 50000 J |
| 1000 hJ | 100000 J |
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How the formula works
Both hectojoule and joule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in hectojoules by 100 to get joules. To reverse the conversion, multiply a joule value by 0.01 to get back to hectojoules.
Frequently asked questions
What is Hectojoule (hJ)?
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
How do I convert hectojoules to joules?
Multiply the hectojoule value by 100 to get the equivalent in joules. For example, 5 hJ × 100 = 500 J.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 100 is an exact, non-rounded value.
Can I convert joules back to hectojoules?
Yes. Divide the joule value by 100, or multiply it by 0.01, to get hectojoules.
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About converting hectojoules to joules
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix. The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Use this calculator to move between hectojoules and joules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.