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Molar Mass Calculator — Free Online Calculator

Molar Mass solves M = Σ(atomic mass × count) — sum the atomic mass of every atom in the formula, weighted by how many of each appear. Enter your known values and the calculator solves for the rest instantly. It runs entirely in your browser, so nothing you enter is uploaded to a server. Free to use, with no signup and no watermark.

How to use Molar Mass

  1. Enter your known values in the fields.
  2. The result updates instantly as you type.
  3. Copy or note down the result.

Frequently asked questions

What formula does Molar Mass use?
M = Σ(atomic mass × count) — sum the atomic mass of every atom in the formula, weighted by how many of each appear.
Can I use it on my phone?
Yes. The layout adapts to small screens and behaves the same on mobile as on desktop.
Is my input saved anywhere?
No. Values stay in your browser and are gone as soon as you close the tab.

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