A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
Hectojoules to Exajoules
Convert Hectojoule (hJ) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert hectojoules (hJ) to exajoules (EJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
EJ = hJ × 1.000000000e-16
Results update instantly for Hectojoules to Exajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
EJ = hJ × 1.000000000e-16
hJ = EJ × 1.000000000e+16
Conversion table
| 1 hJ | 1.000000e-16 EJ |
| 5 hJ | 5.000000e-16 EJ |
| 10 hJ | 1.000000e-15 EJ |
| 20 hJ | 2.000000e-15 EJ |
| 50 hJ | 5.000000e-15 EJ |
| 100 hJ | 1.000000e-14 EJ |
| 500 hJ | 5.000000e-14 EJ |
| 1000 hJ | 1.000000e-13 EJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both hectojoule and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in hectojoules by 1.000000000e-16 to get exajoules. To reverse the conversion, multiply a exajoule value by 1.000000000e+16 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 Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
How do I convert hectojoules to exajoules?
Multiply the hectojoule value by 1.000000000e-16 to get the equivalent in exajoules. For example, 5 hJ × 1.000000000e-16 = 5.000000e-16 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-16 is an exact, non-rounded value.
Can I convert exajoules back to hectojoules?
Yes. Divide the exajoule value by 1.000000000e-16, or multiply it by 1.000000000e+16, to get hectojoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting hectojoules to exajoules
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix. A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Use this calculator to move between hectojoules and exajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.