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Molarity Calculator

Molarity, moles, mass or volume, plus dilutions.

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Common reagent molar masses

ReagentFormulag/mol
Sodium chlorideNaCl58.44
GlucoseC₆H₁₂O₆180.16
Sodium hydroxideNaOH40.00
Hydrochloric acidHCl36.46
Sulfuric acidH₂SO₄98.08
Tris baseC₄H₁₁NO₃121.14
EDTA disodiumC₁₀H₁₄N₂Na₂O₈372.24
Potassium chlorideKCl74.55

Mass to weigh out

—

The solution

Moles of solute—
Molarity—
Molality (approx.)—
Parts per million—

—

Concentration as percentage by mass

Molarity is per litre of final solution, not per litre of solvent added — make up to the mark rather than adding solvent to a measured volume. Molality, in moles per kilogram of solvent, is preferred where temperature varies, because mass does not expand with heat.

Quick Tool Overview

The Molarity Calculator works solution concentration in either direction — how much solute to weigh out for a target molarity, or what molarity a known mass produces — and handles dilutions with the C₁V₁ = C₂V₂ relationship.

What it does
Calculates molarity, moles, mass, volume or a dilution
You give it
A molar mass plus any two of the other values
You get back
The missing value, plus molality and ppm
Best for
Preparing solutions and chemistry coursework
Calculators Free, unlimited use No sign-up Runs in your browser

About the Molarity Calculator

Work out solution concentration in either direction: how much solute to weigh out for a target molarity, or what molarity a known mass in a known volume produces. A dilution mode handles the C₁V₁ = C₂V₂ arithmetic separately.

Molarity is moles of solute per litre of solution — per litre of final solution, not per litre of solvent added, which is the distinction that trips people up when a solute changes the volume noticeably. Molality, moles per kilogram of solvent, avoids that problem and is preferred where temperature varies, since volume expands with heat while mass does not. Both are calculated here.

Key features of the Molarity Calculator

Solves in every direction

Molarity, moles, mass or volume — whichever you need for the bench.

Dilution mode

C₁V₁ = C₂V₂ handled separately, so stock dilutions do not need a second tool.

Molality as well

Moles per kilogram of solvent, which does not shift with temperature the way molarity does.

Several concentration units

Molarity, molality, ppm and percentage by mass, all from the same inputs.

Common reagents listed

Molar masses for the reagents most often used, so you need not look them up.

How to use the Molarity Calculator

  1. 1

    Choose what to find

    Molarity, moles, mass, volume, or a dilution.

  2. 2

    Enter the molar mass

    Of your solute, in grams per mole. Common reagents are listed for reference.

  3. 3

    Fill in what you know

    Mass and volume, or concentration and volume for a dilution.

  4. 4

    Read the answer

    The missing value, plus molality, ppm and percentage concentration.

Frequently asked questions

Moles of solute per litre of solution, written M. A 1 M solution contains one mole of solute in every litre of final solution.

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