Unit Converters · Free tool
Molar Mass Calculator
Calculate molar mass instantly from any chemical formula. Get an element-by-element breakdown, supports nested parentheses and hydrates, using IUPAC 2024 atomic masses online.
Molar mass
18.015 g/mol
| Element | Atoms | Atomic mass | Contribution | % |
|---|---|---|---|---|
| O | 1 | 15.999 | 15.999 | 88.8% |
| H | 2 | 1.008 | 2.016 | 11.2% |
Atomic masses from IUPAC 2024 CIAAW abridged table. Tip: paste this molar mass into the molarity calculator to compute concentration from grams.
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What it does
Type a chemical formula and get the molar mass with a per-element breakdown. Supports nested parentheses, hydrate dots (CuSO4·5H2O), and leading coefficients. Atomic masses are IUPAC 2024 abridged values.
Drop the result into the molarity calculator to convert grams ↔ moles. For dilutions, use the dilution calculator.
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Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/molar-mass-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Molar Mass Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Type the formula — capitalization matters (Co ≠ CO).
- Use parentheses for repeated groups: (NH4)2SO4.
- Use · or * for hydrates: CuSO4·5H2O.
- Click a sample for a starting point.
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