Normality Calculator

Normality is the concentration of reactive equivalents per litre of solution, written eq/L or N. It equals the molarity multiplied by the number of equivalents each mole of solute provides.

Normality equals molarity times the number of equivalents per mole: N = M times equivalents. Rearranged, molarity equals normality divided by equivalents, which is how the tool works when you enter a normality.

Use the reactive units per mole: 1 for HCl or NaOH, 2 for sulfuric acid or Ca(OH)2, 3 for phosphoric acid, and for redox reactions the number of electrons transferred per mole.

When the equivalence factor is 1, as for hydrochloric acid or sodium hydroxide, the normality and molarity are the same number, so 0.5 M HCl is also 0.5 N.

Normality counts reactive equivalents, so equal volumes of equal normality neutralise each other exactly. That makes titration and acid-base stoichiometry simpler, since you can compare solutions without tracking each equivalence factor by hand.

No. It works purely from concentration and the equivalence factor. If you only have a mass and a volume, first work out the molarity, then bring that number here.

The equivalence factor must be greater than zero, and molarity or normality cannot be negative. You also enter exactly one of molarity or normality, never both, and the tool computes the other.

Yes. Any positive number is accepted, so a fractional factor works if your reaction warrants it. The result is simply the product or quotient, rounded to nine decimal places for display.

No. The calculation runs entirely in your browser, so the concentrations you enter never leave your device.