Normality Calculator Formula

Understand the math behind the normality calculator. Each variable explained with a worked example.

Use the Normality Calculator

Formulas Used

Normality

normality = molarity * n_factor

Variables

VariableDescriptionDefault
molarityMolarity(M)1
n_factorEquivalence Factor (n)2

How It Works

How to Calculate Normality

Formula

N = M × n

Where:

  • N = normality (equivalents/L)
  • M = molarity
  • n = equivalence factor (H+ for acids, OH- for bases, electrons for redox)

    • Worked Example

    Find the normality of 1 M H2SO4 (diprotic acid, n = 2).

    molarity = 1n_factor = 2
    1. 01N = M × n
    2. 02N = 1 × 2
    3. 03N = 2 N

    Frequently Asked Questions

    What is normality?

    Normality (N) measures concentration in equivalents per liter. An equivalent depends on the reaction: H+ for acids, OH- for bases, or electrons for redox.

    What is the n-factor?

    The number of reactive units per molecule. For acids: replaceable H+ ions. For bases: OH- ions. For redox: electrons transferred.

    Is normality still commonly used?

    Less common now, but still used in analytical chemistry titrations and water treatment.

    Ready to run the numbers?

    Open Normality Calculator