Molecular Weight Calculator
Enter a chemical formula e.g. H2O, NaCl, C6H12O6, H2SO4
Molar mass (molecular weight) is the mass of one mole (6.022 × 10²³ molecules) of a substance. It is calculated by summing the atomic masses of all atoms in the chemical formula.
- 1Identify each element and its count in the formula
- 2Look up each element's atomic mass (from the periodic table)
- 3Multiply each atomic mass by its count
- 4Sum all values — the result is in g/mol
H₂O=18.015 g/mol2×1.008 + 15.999
NaCl=58.44 g/mol22.99 + 35.45
C₆H₁₂O₆ (glucose)=180.16 g/mol6×12 + 12×1.008 + 6×16
| Element | Symbol | Atomic mass (g/mol) |
|---|---|---|
| Hydrogen | H | 1.008 |
| Carbon | C | 12.011 |
| Nitrogen | N | 14.007 |
| Oxygen | O | 15.999 |
| Sodium | Na | 22.990 |
| Chlorine | Cl | 35.453 |
| Calcium | Ca | 40.078 |
| Iron | Fe | 55.845 |
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Fun Fact
One mole of water (18 g) contains about 6 × 10²³ molecules — more than the number of grains of sand on all Earth's beaches.
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