Calculator Suite

Chemical Molar Mass Calculator

Calculate molar mass, molecular weight, and chemical composition

Chemical Formula

Enter a chemical formula to calculate its molar mass and composition

H₂O (Water)CO₂ (Carbon Dioxide)CH₄ (Methane)C₆H₁₂O₆ (Glucose)C₂H₅OH (Ethanol)NaCl (Salt)CaCO₃ (Limestone)H₂SO₄ (Sulfuric Acid)

Ca(OH)₂ (Lime)NH₃ (Ammonia)C₈H₁₈ (Octane)C₆H₆ (Benzene)

• Element symbols are case-sensitive (Fe not fe)

• Use parentheses for groups: Ca(OH)₂

• Numbers indicate atom count: H₂O

• Coefficients multiply entire groups: 2NaCl

• Examples: C₆H₁₂O₆, Al₂(SO₄)₃, Ca(NO₃)₂

Chemistry Formulas

Key formulas used in molar mass calculations

M = \sum_{i} n_i \times A_i

$M$ = Molar mass (g/mol)

$n_i$ = Number of atoms of element i

$A_i$ = Atomic weight of element i

\text{Mass \%} = \frac{n_i \times A_i}{M} \times 100\%

Percentage contribution of each element to total mass

\text{Ratio} = \frac{n_i}{\gcd(n_1, n_2, \dots, n_k)}

Simplest whole number ratio of atoms

Understanding Molar Mass

Molar mass is the mass of one mole (6.022 × 10²³ particles) of a substance, expressed in grams per mole (g/mol).

This calculator uses IUPAC 2024 atomic weights with the latest revisions for gadolinium, lutetium, and zirconium.

Use standard chemical notation: H₂O, Ca(OH)₂, C₆H₁₂O₆. Element symbols are case-sensitive (Fe, not fe).

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