A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
Hectojoules to Kilojoules
Convert Hectojoule (hJ) to Kilojoule (kJ) instantly with an exact formula, conversion table, and FAQ.
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Convert hectojoules (hJ) to kilojoules (kJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
kJ = hJ × 0.1
Results update instantly for Hectojoules to Kilojoules conversions.
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Formula
kJ = hJ × 0.1
hJ = kJ × 10
Conversion table
| 1 hJ | 0.100000 kJ |
| 5 hJ | 0.500000 kJ |
| 10 hJ | 1 kJ |
| 20 hJ | 2 kJ |
| 50 hJ | 5 kJ |
| 100 hJ | 10 kJ |
| 500 hJ | 50 kJ |
| 1000 hJ | 100 kJ |
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How the formula works
Both hectojoule and kilojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in hectojoules by 0.1 to get kilojoules. To reverse the conversion, multiply a kilojoule value by 10 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 Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
How do I convert hectojoules to kilojoules?
Multiply the hectojoule value by 0.1 to get the equivalent in kilojoules. For example, 5 hJ × 0.1 = 0.500000 kJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.1 is an exact, non-rounded value.
Can I convert kilojoules back to hectojoules?
Yes. Divide the kilojoule value by 0.1, or multiply it by 10, to get hectojoules.
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About converting hectojoules to kilojoules
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix. A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Use this calculator to move between hectojoules and kilojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.