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Double Bond Equivalent Calculator

Result

Calculated result 2.5 Based on the values entered.
↗ Chemistry

Double Bond Equivalent Calculator Calculate the Degree of Unsaturation (Double Bond Equivalent, DBE) for an organic molecule from its molecular formula. — free online calculator.

Formula

DBE = C − H/2 + N/2 + 1 − X/2
  • Double Bond Equivalent Calculator calculates its result from X, C, Periods, Height. It uses the formula DBE = C − H/2 + N/2 + 1 − X/2. Change any input to recalculate the result instantly.
  • The main inputs are X, C, Periods, Height. Enter them in the units and format shown in the calculator.
  • Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Double Bond Equivalent

Inputs
  • X: 2
  • C: 3
  • Periods: 4
  • Height: 5

Using X = 2, C = 3, Periods = 4, Height = 5, the calculated result is 2.5.

Sample result: Calculating…

Frequently asked questions

What does the Double Bond Equivalent calculate?

Double Bond Equivalent Calculator Calculate the Degree of Unsaturation (Double Bond Equivalent, DBE) for an organic molecule from its molecular formula. — free online calculator.

Which values should I enter?

Enter X, C, Periods, Height using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: DBE = C − H/2 + N/2 + 1 − X/2.

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026