Mole Calculator
Calculate moles, mass, or concentration of a substance using molar mass and volume.
Published by:
isCalculator Editorial Team
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How to Use the Mole Calculator
This calculator computes moles (mol), mass (g), or concentration (M) based on the values you provide. All inputs must be in metric units (grams, liters, g/mol).
- Enter the substance name (e.g., H₂O) – optional but helpful for identification.
- Provide the molar mass (g/mol) – this is required and must be a positive number.
- Fill in exactly two of the three remaining fields:
- Mass (g) – the weight of the substance.
- Volume (L) – the volume of the solution.
- Concentration (M) – molarity of the solution.
- Click Calculate to see the result and the step-by-step formula used.
Examples:
- Mass + Molar Mass → moles (n = m / M)
- Volume + Concentration → moles (n = C × V)
- Mass + Volume → concentration (C = n / V)
Tip: If you fill all three fields or leave more than one empty, an error will appear.
Previous Results
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Frequently Asked Questions
A mole is a unit that measures the amount of a substance. One mole contains exactly 6.02214076×10²³ elementary entities (Avogadro's number).
Moles = Mass (g) / Molar Mass (g/mol). Enter the mass and molar mass, and leave volume and concentration blank.
Yes. Concentration (M) = (Mass / Molar Mass) / Volume (L). Enter mass, molar mass, and volume, leave concentration blank.