Equivalent Weight Calculator


Calculating equivalent weight is a crucial step in various chemical processes and reactions. It helps determine the amount of a substance that will react with a certain quantity of another substance. To simplify this calculation, we present an easy-to-use equivalent weight calculator.

How to Use

Using the equivalent weight calculator is straightforward. Simply input the relevant values and click the “Calculate” button to obtain the equivalent weight. Follow these steps:

  1. Enter the molar mass of the substance.
  2. Enter the valence of the substance.
  3. Click the “Calculate” button to get the equivalent weight.


The formula for calculating equivalent weight (EW) is given by:

Example Solve

Let’s consider an example where we want to find the equivalent weight of sulfuric acid (H₂SO₄):

  1. Molar mass of H₂SO₄ = 98 g/mol
  2. Valence of H₂SO₄ = 2
  3. Using the formula:
  1. So, the equivalent weight of sulfuric acid is 49 g/mol.


Q: What is equivalent weight?

Equivalent weight is the mass of a substance that reacts with one mole of hydrogen ions (H⁺) or one mole of electrons in a chemical reaction.

Q: How is equivalent weight different from molecular weight?

While molecular weight represents the mass of a molecule, equivalent weight is specific to the reaction it undergoes. It accounts for the number of reacting species involved in a reaction.

Q: Why is equivalent weight important in chemistry?

Equivalent weight is crucial for stoichiometric calculations in chemical reactions. It helps determine the amounts of reactants required to achieve a desired outcome.

Q: Can equivalent weight be negative?

No, equivalent weight cannot be negative as it represents a physical quantity of a substance involved in a reaction.


The equivalent weight calculator provided here simplifies the process of determining equivalent weight, a fundamental parameter in chemistry. By inputting the molar mass and valence of a substance, users can quickly obtain the equivalent weight, aiding in various chemical calculations.

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