Enter your mixture's components — their names, molar masses, and compositions (mole or mass fractions, or percentages) — and this Mixture Average Molar Mass Calculator returns the average molar mass of the blend, along with the total fraction and a normalization status so you always know if your composition adds up correctly.
Average Molar Mass
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Total Fraction/Percentage
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Normalization Status
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Average molar mass is the weighted average of the molar masses of all components in a mixture, calculated using their mole fractions. It's crucial for gas mixture calculations, determining density, and stoichiometric calculations involving mixtures.
Mole fractions are decimal values between 0 and 1 that sum to 1.000, while percentages are values between 0 and 100 that sum to 100%. Both represent the proportion of each component in the mixture.
The calculator will automatically normalize your values if they're close to the expected total (within reasonable rounding error). A warning message will indicate if normalization was applied.
You can find molar masses on the periodic table by adding up atomic masses of all atoms in the molecule. For example, O₂ = 2 × 15.999 = 31.998 g/mol, and N₂ = 2 × 14.007 = 28.014 g/mol.
This calculator supports up to 6 components. For mixtures with more components, you can group similar components together or use specialized software for complex mixture analysis.
This calculator works for any ideal mixture including gas mixtures, solution components, or any combination where components don't chemically react with each other.
The accuracy depends on the precision of your input values. The calculator can display results with up to 6 decimal places and assumes ideal mixing behavior (no volume changes upon mixing).