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Chemistry TutorMOHAMMAD ABUSAIF
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CHEMISTRY · CALCULATE · UNDERSTAND

Mole Calculator

Find any one of mass, amount of substance, or molar mass from the other two.

Introductory chemistry

Enter your values

Use a decimal point or scientific notation (1e-3). Choose units before calculating.

Enter a positive mass for the sample.
Enter a positive molar mass in g/mol.
Try an example

Calculations run on your device. No account, name or email is required.

Your result

Enter your values and press Calculate to see your answer and all five solution steps.

m = nM; n = m/M; M = m/n

Common Mistakes

  • Do not enter mg while leaving the mass unit set to g; the result changes by a factor of 1000.
  • Do not divide by zero: each known mass, amount, and molar mass must be positive.
  • Use molar mass in g/mol, not an unlabelled molecular or formula mass in u (Da).

Assumptions and limitations

  • Supported scope: one pure substance with a known molar mass. The calculator does not parse chemical formulas or determine atomic weights.
  • Results are formatted to at most eight significant digits; report significant figures appropriate to the measurements.
  • Scientific notation and Arabic numerals are accepted. Inputs must be positive and within the shared finite numerical range.

m = nM; n = m/M; M = m/n

Learn More

Connect the calculation to your chemistry course and try a related tool.

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Scientific references

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