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Molar Mass Calculator
Work out the molar mass and mass percentages of any chemical formula, and convert grams to moles.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Molar Mass Calculator works
All maths runs in your browser. Exact fractions and big integers are used where rounding would give wrong answers. Brackets, hydrates and charges are understood, so CuSO4ยท5H2O and K4[Fe(CN)6] both work.
Input: Text. Output: Text.
How to use Molar Mass Calculator
- Type a formula.
- Read the molar mass and element shares.
- Convert between grams, moles and molecules.
Tips
- Exact fractions are used where rounding would give wrong answers.
- Every tool works offline once the page has loaded.
Molar Mass Calculator FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
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