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Molarity Calculator

Molarity from moles per litre — solve for any of M, mol, or L, or convert mass via molar mass.

Runs locally·Free, no signup·Updated May 6, 2026
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How it works

A walkthrough, end to end.

  1. 1

    Enter any two of molarity, moles, or volume.

  2. 2

    The third is computed.

  3. 3

    Optional: enter molar mass to derive grams of solute needed.

Reference

Molarity

M = n / V. Mass = n × molar mass.

Use cases

What you can do with this.

Lab solutions

Prepare a 0.1 M NaCl solution exactly.

Buffer prep

Compute moles needed for buffer recipes.

Titration

Solve concentration from volume × molarity.

Chemistry homework

Verify M = n/V problems instantly.

Pharmaceutical formulation

Convert mass to moles using molar mass.

FAQ

Frequently asked.

  • Molarity = mol/L solution. Molality = mol/kg solvent.

  • Convert: 1000 mL = 1 L.

  • No. All math runs in your browser.

  • Use M₁V₁ = M₂V₂ for dilution problems.