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Free moles to grams calculator & chemistry conversion calculator. Convert moles to grams using molar mass, stoichiometry calculations & chemical formulas. Our calculator uses Avogadro's number principles to provide accurate mass conversions for chemical reactions and laboratory work.
Last updated: February 2, 2026
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Enter the amount of substance in moles
Molecular weight of the compound in grams per mole
Moderate quantity: 45.04 grams
Conversion formula
Mass = Moles × Molar Mass
Calculate mass from moles using molecular weight
Atomic masses
Sum of Element Weights
Add atomic masses of all atoms in the molecule
Mole ratios
Balanced Equations
Use balanced chemical equations for accurate calculations
Unit conversions
Moles ↔ Grams ↔ Molecules
Convert between moles, grams, and number of molecules
Formula mass
g/mol Units
Determine molecular weight in grams per mole
Particle count
6.022 × 10²³
Convert moles to number of atoms or molecules
For 2.5 moles of water (H₂O, molar mass = 18.015 g/mol):
Moles
2.5 mol
Molar Mass
18.015 g/mol
Mass
45.04 g
Our moles to grams calculator uses fundamental chemistry principles to convert between moles and mass. The calculation applies Avogadro's number and molar mass concepts to provide accurate conversions for chemical reactions, laboratory work, and stoichiometry calculations.
Mass (grams) = Moles × Molar Mass (g/mol)Moles = Mass (grams) ÷ Molar Mass (g/mol)Molar Mass = Sum of atomic masses in moleculeThis fundamental relationship connects the amount of substance (moles) with its mass (grams) through the molar mass conversion factor. The molar mass represents the mass of one mole of the substance.
Shows the relationship between moles, molar mass, and grams in chemical calculations
Moles to grams conversion is based on the mole concept and Avogadro's number (6.022 × 10²³). The mole is a counting unit that represents a specific number of particles, while molar mass provides the mass per mole. This relationship is essential for stoichiometry and quantitative chemistry.
Need help with other chemistry calculations? Check out our mole calculator and percent yield calculator.
Get Custom Calculator for Your PlatformResult: 3.2 moles of NaCl = 187.008 grams
The mass of 3.2 moles of sodium chloride is 187.008 grams.
1.5 moles of H₂O (18.015 g/mol)
Mass = 1.5 × 18.015 = 27.02 g
0.8 moles of CO₂ (44.01 g/mol)
Mass = 0.8 × 44.01 = 35.21 g
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