How to use the degree of unsaturation calculator
Find the number of rings and double bonds (or half that for triple bonds) in a molecule from its formula. Enter carbon atoms, hydrogen atoms, halogen atoms, nitrogen atoms in the fields above; the degrees of unsaturation, interpretation are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “degrees of unsaturation”, “index of hydrogen deficiency”, “DBE from formula”, “calculate degree of unsaturation”, “find degrees of unsaturation”.
Formula
Variables
- C — Carbon atoms
- Hc — Hydrogen atoms
- Xh — Halogen atoms
- Nn — Nitrogen atoms
Worked example
With carbon atoms = 6, hydrogen atoms = 6, halogen atoms = 0, nitrogen atoms = 0, the calculator gives degrees of unsaturation ≈ 4; interpretation ≈ Likely aromatic or several rings and double bonds text.
Frequently asked questions
What is the degree of unsaturation calculator used for?
Find the number of rings and double bonds (or half that for triple bonds) in a molecule from its formula. It helps with questions such as “degrees of unsaturation”, “index of hydrogen deficiency”, “DBE from formula”.
What is the formula for the degree of unsaturation calculation?
Degrees of unsaturation = C-(Hc+Xh) / 2+Nn / 2+1. Interpretation (text) = [Degrees of unsaturation]>=4?"Likely aromatic or several rings and double bonds":"Some unsaturation or mostly saturated". Here C is carbon atoms, Hc is hydrogen atoms, Xh is halogen atoms, Nn is nitrogen atoms.
What inputs do I need for the degree of unsaturation calculator?
You need carbon atoms, hydrogen atoms, halogen atoms, nitrogen atoms. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the degree of unsaturation calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the degree of unsaturation result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.