Molar Mass Calculator
Calculate the molar mass of any chemical compound from its molecular formula.
Enter Chemical Formula
Use standard chemical notation (e.g., H2O, NaCl, Ca(OH)2)
Molar Mass
18.015 g/mol
H2O - 3 atoms total
Element Breakdown
O
Oxygen
15.999 g/mol x 1
15.999 g/mol
88.81%
H
Hydrogen
1.008 g/mol x 2
2.016 g/mol
11.19%
Quick Conversions
1 mole =
18.015 g
1 gram =
0.055509 mol
Molecules/mole
6.022 x 10^23
At STP (gas)
22.4 L/mol
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Chemistry: The Central Science
by Brown, LeMay, Bursten
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.