Degree of Unsaturation Calculator
Our organic chemistry calculator computes degree unsaturation accurately. Enter measurements for results with formulas and error analysis.
Formula
DoU = (2C + 2 + N - H - X) / 2
C is the number of carbons, H is hydrogens, N is nitrogens, and X is halogens. Oxygen and sulfur do not appear because they do not change the hydrogen count. Each degree represents one ring or double bond; a triple bond counts as two degrees.
Worked Examples
Example 1: Benzene (C6H6)
Problem: Calculate the degree of unsaturation for benzene with molecular formula C6H6.
Solution: DoU = (2(6) + 2 + 0 - 6 - 0) / 2\nDoU = (12 + 2 - 6) / 2\nDoU = 8 / 2 = 4\n3 double bonds + 1 ring = 4 DoU
Result: DoU = 4 (aromatic ring)
Example 2: Chloroform (CHCl3)
Problem: Calculate the degree of unsaturation for chloroform (CHCl3).
Solution: DoU = (2(1) + 2 + 0 - 1 - 3) / 2\nDoU = (2 + 2 - 1 - 3) / 2\nDoU = 0 / 2 = 0\nFully saturated, no rings or double bonds
Result: DoU = 0 (fully saturated)
Frequently Asked Questions
What is the degree of unsaturation?
The degree of unsaturation (DoU), also called the index of hydrogen deficiency or double bond equivalents, is a formula used to determine the number of rings and/or double bonds in a molecular formula. It is calculated as DoU = (2C + 2 + N - H - X) / 2, where C is carbon, H is hydrogen, N is nitrogen, and X is the number of halogens. Each double bond or ring contributes one degree, while a triple bond contributes two degrees of unsaturation.
How accurate are the results from Degree of Unsaturation Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
Can I use Degree of Unsaturation Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.