What is the Normality Calculator?

Normality (N) measures equivalents of solute per liter of solution — the unit chemists often use for acid-base titrations and redox work. It relates to molarity by N = M × n, where n is the equivalence factor (replaceable H⁺, OH⁻, or electrons per formula unit). For example, 0.5 M H₂SO₄ has N = 1.0 because each mole supplies two acid equivalents. This calculator converts between normality and molarity, finds normality from dissolved mass, or tells you how many grams to weigh for a target N. Enter a formula for automatic molar mass lookup, pick common n presets (HCl, H₂SO₄, NaOH), and get instant results in your browser.

How to use the Normality Calculator

1. Choose a mode: find N from M, find M from N, find N from mass, or find mass for a target N.
2. Enter the equivalence factor n (use presets for common acids and bases).
3. For mass-based modes, enter the solute formula and volume in L or mL.
4. Read normality (eq/L), molarity (mol/L), and mass when applicable.
5. Copy the summary for your titration lab notes.

Common use cases

• Converting 0.5 M sulfuric acid to normality for a titration lab
• Finding how many grams of NaOH to dissolve for 0.1 N in 500 mL
• Checking normality after weighing 49 g H₂SO₄ in 1 L of solution

Frequently asked questions

What is the normality formula?

N = M × n, where M is molarity (mol/L) and n is equivalents per mole. Equivalents per liter: N = (mass × n) / (molar mass × volume in L).

What is the equivalence factor for H2SO4?

In acid-base titrations, H₂SO₄ has n = 2 because each mole can donate two H⁺ ions. So 0.5 M H₂SO₄ is 1 N.

Normality vs molarity — which should I use?

Molarity (mol/L) is standard for general stoichiometry. Normality (eq/L) is convenient when reactions depend on equivalents, such as titrations. This tool converts between them.