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Molarity calculator

Calculate molarity as moles of solute divided by final solution volume in litres.

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Answer

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Calculate molarity as moles of solute divided by final solution volume in litres.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Step-by-step calculation
Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.
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    Formula and assumptions
    Use final solution volume, not solvent volume before mixing. This computes analytical concentration and does not model dissociation, activity or temperature expansion.
    Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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    Using Molarity calculator
    Calculate molarity as moles of solute divided by final solution volume in litres.
    Use final solution volume, not solvent volume before mixing. This computes analytical concentration and does not model dissociation, activity or temperature expansion.
    Next: Dilution calculator
    A worked example
    Example inputs: solute amount (mol) = 0.5, final solution volume (l) = 2. Molar concentration (mol/L) = 0.25.
    Before you use the result
    Use final solution volume, not solvent volume before mixing. This computes analytical concentration and does not model dissociation, activity or temperature expansion.
    Example results for solute amount (mol)
    These examples use Final solution volume (L): 2. They are reference calculations, not recommended settings.
    Solute amount (mol)Molar concentration (mol/L)
    0.250.125
    0.50.25
    10.5
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    ToolOctopus. “Molarity calculator.” Updated 2026-09-26. https://tooloctopus.com/molarity-calculator.
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