Normality Calculator
Equivalents per litre, and why the factor depends on the reaction.
Work out Normality. Equivalents per litre, and why the factor depends on the reaction. Temperature in kelvin, handled for you.
Protons donated, electrons transferred, or charge — 2 for H₂SO₄, 1 for HCl, 3 for H₃PO₄ fully neutralised.
Normality (N)
2
1 M × 2 equivalents
Normality is molarity times the number of reactive equivalents per formula unit, so 1 M sulfuric acid is 2 N when both protons are neutralised. The catch is that the factor depends on the reaction, not the compound: sulfuric acid is 2 N against a strong base and 1 N in a reaction that takes only the first proton. A normality quoted without its reaction is incomplete, which is why IUPAC discourages the unit.
How the Normality Calculator works
Normality is molarity times the reactive equivalents per formula unit, so 1 M sulfuric acid is 2 N when both protons are neutralised. The catch is that the factor depends on the reaction rather than the compound, which is why IUPAC discourages the unit.
Also known as: normality to molarity converter · equivalents per litre calculator · gram equivalent calculator · how to calculate normality
Frequently asked questions
How do I convert molarity to normality?
Multiply by the number of equivalents — protons donated, electrons transferred, or charge. 1 M H₂SO₄ is 2 N against a strong base.
Why is normality discouraged?
Because the same solution has different normalities in different reactions. Sulfuric acid is 2 N when both protons react and 1 N when only the first does, so a normality quoted without its reaction is incomplete.
Where is it still used?
Titration and water treatment, where the reaction is fixed by the protocol and normality makes the arithmetic at the equivalence point trivial.
Put this calculator on your own site
Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.
<iframe src="https://www.thecalclibrary.com/embed/normality-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Normality Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/normality-calculator" style="color:#64748b">Normality Calculator</a> from The Calc Library</p>The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.