Introducing our grams to moles calculator, the ultimate tool for swift and hassle-free conversions between grams and moles of any substance. Whether you’re deciphering grams to moles or vice versa, this versatile calculator has you covered. Let’s delve into the grams to moles formula, explore how to calculate moles from grams, and discover the significance of Avogadro’s number.

Calculating Moles from Grams: The Formula

To accurately determine the moles (n) of a substance with a given mass (m) in grams, utilize the grams-to-moles formula:


Here, M represents the molar mass of the substance, measured in g/mol. A mole, in essence, corresponds to Avogadro’s number, a staggering 6.02214085774×10236.02214085774×1023 atoms, molecules, or entities. This unit of quantity simplifies complex measurements, akin to a dozen or a gross.

Using the Calculator

Our user-friendly grams to moles calculator simplifies the process:

  1. Select a compound group (Common Gases and Liquids, Salts, Acids, Alkalis, Organic, or Pure Metals).
  2. Choose the desired chemical or input a custom molar mass.
  3. Enter the mass of your substance.

Voila! The calculator swiftly provides the moles, with an Advanced mode option to reveal the total number of molecules or atoms.

Example: Converting Grams to Moles

Let’s illustrate how to calculate moles from grams using an example. Assume you have 6 liters of pure water:

  1. Find the molar mass of a water molecule (H₂O), approximately 18.015 g/mol.
  2. Convert the water volume to mass, assuming a density of 998 kg/m³. 6L×998kg/m³=0.006m³×998kg/m³=5.988kg Convert to grams: 5.988 kg=5988 g5.988kg=5988g.
  3. Apply the grams to moles formula: =5988 g18.015 g/mol=332.4 moln=18.015g/mol5988g​=332.4mol

For hassle-free calculations, use our grams to moles calculator.

Frequently Asked Questions (FAQ)

1. How do I convert from grams to moles?

  • Measure the sample mass in grams.
  • Determine the substance’s molar mass.
  • Divide the mass by the molar mass to obtain the moles.

2. What is molar mass?

  • Molar mass is the mass of one mole of a substance, reflecting Avogadro’s number of atoms or molecules. It varies across the periodic table.

3. How many moles are in 100 grams of water?

  • In 100 grams of water, there are 5.551 moles. Calculate by dividing the mass by the molar mass.

4. How do I calculate molar mass?

  • Determine molar mass through theoretical knowledge, experimental methods, or by summing the atomic molar masses using the periodic table.