Created By : Rina Nayak

Reviewed By : Rajashekhar Valipishetty

Last Updated : Apr 29, 2023

The Normality Calculator is a free online tool for determining the normality of a chemical solution. The online normality calculator tool speeds up the calculation and displays the solution's normality in a matter of seconds.

Weight of Solute
Volume of solvent
Equivalent Weight

What is meant by Normality?

most commonly used to calculate the concentration of a solution, which is equal to the ratio of gramme equivalent weight to litres of solution.

According to the standard definition, normality is defined as the number of grammes of mole equivalents of solute contained in one litre of a solution. The amount of moles of reactive units in a chemical is what we mean when we say equivalent.

Normality Formula

There are different formulas to measure the Normality given the other parameters. We have mentioned all of them for your knowledge below and they are as such

  • Normality N = weight of solute/(volume of solvent x equivalent weight)
  • Normality N = Equivalent of solute/liters of solution
  • N = (Molarity × Molar mass)/ [Equivalent mass]
  • N = Molarity × Basicity = Molarity × Acidity

Number of gram equivalents = weight of solute / [Equivalent weight of solute]

How does our Normality Calculator Work?

The normality calculator can be used in the following way

  • In the input field, type in the solute's equivalent, litres of solution, and x for unknown.
  • To calculate normality, click the "Calculate" button
  • The output field will finally show the chemical solution's normality.

Benefits of Normality

Normality is used in three different situations and go through them below

  • In acid-base chemistry, determining concentrations. Normality, for example, is used to show the quantities of hydronium ions (H3O+) or hydroxide ions (OH–) in a solution.
  • In precipitation reactions, normality is used to calculate the amount of ions likely to precipitate in a given reaction.
  • It's utilised in redox processes to determine how many electrons a reducing or oxidising substance can take or donate.

Normality Examples

Example 1: What are the chances that the following is normal: 0.1381 M NaOH and 0.0521 M H3PO4


N = 0.1381 mol/L × (1 eq/1mol)

Which is = 0.1381 eq/L

= 0.1381 N

N = 0.0521 mol/L × (3 eq/1mol)

=0.156 eq/L

= 0.156 N

Example 2: Calculate and find the normalcy in the following reaction.1.0 M H3PO4

H3AsO4 + 2NaOH → Na2HAsO4 + 2H2O


When we examine the reaction, we can see that just two of the H+ ions in H3AsO4 react with NaOH to produce the result. As a result, the two ions have two equivalents. We shall use the given formula to determine normality.

N = Molarity (M) × no. of equivalents

N = 1.0 × 2 (replacing the values)

As a result, the solution's normality is = 2.0.

Relation between Normality and Molarity

Normality and Molarity are the commonly used expressions in chemistry. Both of them denote the quantitative measurement of a substance.

The formula for Molarity is Molarity (M) = No. of moles of solute × [volume of the solution in litres]-1

Normality = [Molarity × Molar mass] × [Equivalent mass]-1

Normality = Molarity × Basicity

Normality = Molarity × Acidity

N = M × number of equivalents

FAQ’s on Normality Calculator

1. What is meant by Normality?

Normality is used to determine the equivalent concentration of a solution.

2. What is the formula to calculate Normality?

The formula to calculate Normality is N = weight of solute/(volume of solvent x equivalent weight).

Moles = mass of the substance in grams/molecular weight.

3. What is the relation between Normality and Molarity?

The Relation between Normality and Molarity is given by the expression Normality = [Molarity × Molar mass] × [Equivalent mass]^-1