Benzene (C6H6)
Number of Carbon Atoms (C): 6; Number of Hydrogen Atoms (H): 6; Number of Nitrogen Atoms (N): 0; Number of Halogen Atoms (X): 0
Index of Hydrogen Deficiency (IHD): 4
Index of Hydrogen Deficiency (IHD) Calculator
Chemistry0.0(0)
Calculates the Index of Hydrogen Deficiency (IHD), also known as the Degree of Unsaturation, which indicates the number of rings and/or pi bonds in a molecule.
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How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Number of Carbon Atoms (C), Number of Hydrogen Atoms (H), Number of Nitrogen Atoms (N), and Number of Halogen Atoms (X) in the units shown.
Step 2
Read Index of Hydrogen Deficiency (IHD) in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Cyclohexane (C6H12)
Number of Carbon Atoms (C): 6; Number of Hydrogen Atoms (H): 12; Number of Nitrogen Atoms (N): 0; Number of Halogen Atoms (X): 0
Index of Hydrogen Deficiency (IHD): 1
Ethene (C2H4)
Number of Carbon Atoms (C): 2; Number of Hydrogen Atoms (H): 4; Number of Nitrogen Atoms (N): 0; Number of Halogen Atoms (X): 0
Index of Hydrogen Deficiency (IHD): 1
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