A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
Hectojoules to Calories
Convert Hectojoule (hJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert hectojoules (hJ) to calories (cal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
cal = hJ × 23.90057361
Results update instantly for Hectojoules to Calories conversions.
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Formula
cal = hJ × 23.90057361
hJ = cal × 0.04184
Conversion table
| 1 hJ | 23.900574 cal |
| 5 hJ | 119.502868 cal |
| 10 hJ | 239.005736 cal |
| 20 hJ | 478.011472 cal |
| 50 hJ | 1195.028681 cal |
| 100 hJ | 2390.057361 cal |
| 500 hJ | 11950.286807 cal |
| 1000 hJ | 23900.573614 cal |
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How the formula works
Both hectojoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in hectojoules by 23.90057361 to get calories. To reverse the conversion, multiply a calorie value by 0.04184 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 Calorie (cal)?
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
How do I convert hectojoules to calories?
Multiply the hectojoule value by 23.90057361 to get the equivalent in calories. For example, 5 hJ × 23.90057361 = 119.502868 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 23.90057361 is an exact, non-rounded value.
Can I convert calories back to hectojoules?
Yes. Divide the calorie value by 23.90057361, or multiply it by 0.04184, to get hectojoules.
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About converting hectojoules to calories
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix. A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
Use this calculator to move between hectojoules and calories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.