1.Percentage of Ionic character =
(Observed dipole moment / Calculated dipole moment) × 100
Calculated dipole moment = magnitude of the charge × distance between the two charges]
2.Percentage of Ionic character = [16(X₁ -X₂) + 3.5(X₁ - X₂)²]
X₁ ⇒ Electronegativity of the first atom.
X₂ ⇒ Electronegativity of the second atom.]
Using any of the above formulas, the percentage of ionic character can be calculated.