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Degree of Unsaturation Calculator
The degree of unsaturation, also known as the index of hydrogen deficiency or the double bond equivalent, is a measure used in organic chemistry to determine the number of pi bonds and rings present in a molecule. It is calculated from the molecular formula of the compound and is used to help draw the compound's structure.
Equation
Degree of Unsaturation
=
0.5
×
2
+2
×number of carbon atoms
-number of hydrogen atoms
+number of nitrogen atoms
-number of halogen atoms
Inputs
| Degree of Unsaturation: | |
| number of carbon atoms: | |
| number of hydrogen atoms: | |
| number of nitrogen atoms: | |
| number of halogen atoms: |
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References
This online resource may be cited as follows
MLA | "Quest Calculate™ Degree of Unsaturation Calculator." AAT Bioquest, Inc., 24 Oct. 2025, https://www.aatbio.com/tools/solve-equation-calculator/degree-of-unsaturation. | |
APA | AAT Bioquest, Inc. (2025, October 24). Quest Calculate™ Degree of Unsaturation Calculator. AAT Bioquest. https://www.aatbio.com/tools/solve-equation-calculator/degree-of-unsaturation. | |
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