How to use the equivalent weight calculator
Find the equivalent weight of a compound from its molar mass and number of equivalents per mole. Enter molar mass, equivalents per mole in the fields above; the equivalent weight, equivalents in 10 g are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “equivalent weight”, “gram equivalent”, “acid equivalent mass”, “calculate equivalent weight”, “find equivalent weight”.
Formula
Variables
- M — Molar mass (g/mol)
- n — Equivalents per mole
Worked example
With molar mass = 98.08 g/mol, equivalents per mole = 2, the calculator gives equivalent weight ≈ 49.04 g/eq; equivalents in 10 g ≈ 0.2039152 eq.
Frequently asked questions
What is the equivalent weight calculator used for?
Find the equivalent weight of a compound from its molar mass and number of equivalents per mole. It helps with questions such as “equivalent weight”, “gram equivalent”, “acid equivalent mass”.
What is the formula for the equivalent weight calculation?
Equivalent weight (g/eq) = M / n. Equivalents in 10 g (eq) = 10 / [Equivalent weight]. Here M is molar mass (g/mol), n is equivalents per mole.
What inputs do I need for the equivalent weight calculator?
You need molar mass in g/mol, equivalents per mole. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the equivalent weight calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the equivalent weight result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.