Calculate normality from solute mass, molar mass, equivalents per mole and solution volume.
Result
How to use this tool
Enter solute mass, molar mass and equivalents per mole.
Enter the final solution volume in L or mL.
Read equivalents, normality and molarity side by side.
Confirm the equivalents value matches your reaction before trusting the result.
Formula & worked example
49 g of H₂SO₄ (98 g/mol, 2 equivalents) in 1 L is 1 N (and 0.5 mol/L).
Limitations — read this before you rely on it
Equivalents are reaction-dependent: the same solute can have a different normality in a different reaction, so state the reaction when reporting N.
Frequently asked questions
Equivalents of solute per litre of solution, written N (eq/L). It measures reactive capacity rather than particle count.
Normality = molarity × equivalents per mole: 1 for HCl or NaOH, 2 for H₂SO₄ or Ca(OH)₂, 3 for H₃PO₄ as an acid.
The same compound can have different equivalents in different reactions; for redox, equivalents follow electrons transferred.
Yes, mainly in titrations and older analytical procedures, though molarity is preferred in most modern work.
The final solution volume in litres or millilitres, not the solvent volume.