Calculator
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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This online tool may be cited as follows
MLA | "Quest Calculate™ Degree of Unsaturation Calculator." AAT Bioquest, Inc., 8 Sep. 2025, https://www.aatbio.com/tools/solve-equation-calculator/degree-of-unsaturation. | |
APA | AAT Bioquest, Inc. (2025, September 8). Quest Calculate™ Degree of Unsaturation Calculator. AAT Bioquest. https://www.aatbio.com/tools/solve-equation-calculator/degree-of-unsaturation. | |
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