Molecular Weight Calculator
Compute molecular (molar) weight from a chemical formula like H2O, C6H12O6 or Ca(OH)2. The formula parser supports nested parentheses and multi-digit counts, returning total grams per mole, a per-element breakdown table with mass percentages, and a composition donut chart.
TheCalculators — Molecular Weight Calculator
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Molar Mass
180.156 g/mol
C6H12O6 · 24 atoms per molecule
- Formula
- C6H12O6
- Distinct Elements
- 3
- Total Atoms
- 24
- Molar Mass
- 180.156 g/mol
- Heaviest Contributor
- O (53.3%)
- Moles in 10 g
- 0.056 mol
Composition by mass
- O96.0%
- C72.1%
- H12.1%
Element breakdown
How the mass adds up
- 1O × 615.999 × 6 = 95.994 g/mol
- 2C × 612.011 × 6 = 72.066 g/mol
- 3H × 121.008 × 12 = 12.096 g/mol
- 4Sum everything95.99 + 72.07 + 12.1 = 180.156 g/mol
Uses standard (average) atomic weights — isotopic variants will shift results slightly. The parser supports nested parentheses but not hydrate dots (CuSO4·5H2O), charges, or brackets.
Most useful next
Formula
M = Σ (atom count × standard atomic weight), parentheses multiply the atoms inside
Pro tips
- • Sanity check: water = 18.015 g/mol; glucose C6H12O6 = 180.156 g/mol.
- • Multiply moles × molar mass to convert to grams: 2 mol NaCl ≈ 116.9 g.
FAQ
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