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Molar Mass Calculator — Molecular Weight from Formula

Molar mass / molecular weight from a chemical formula (parentheses + hydrates) with a per-element breakdown. Client-side.

Free No signup Client-side Privacy friendly Updated

How to use

  1. 1 Type a chemical formula — use parentheses and · for hydrates (e.g. CuSO4·5H2O).
  2. 2 The molar mass in g/mol is shown instantly.
  3. 3 A breakdown shows each element’s contribution.

Why use this tool

  • Parses parentheses and hydrates, not just simple formulas.
  • Per-element breakdown so you can check the work.
  • Uses standard atomic weights for all 118 elements. Runs in your browser.

Frequently asked questions

What is molar mass?

The mass of one mole of a substance, in grams per mole (g/mol). It equals the sum of the atomic masses of every atom in the formula.

How do I enter a hydrate?

Use a middle dot or a period before the water part, e.g. CuSO4·5H2O or CuSO4.5H2O.

Does it handle parentheses?

Yes — nested groups like (NH4)2SO4 and Ca(OH)2 are parsed correctly.

Where do the atomic masses come from?

Standard atomic weights; for radioactive elements without a stable isotope, the mass number of the most stable isotope is used.

What is Molar Mass Calculator?

A molar mass calculator computes the mass of one mole of a compound in grams per mole by summing the standard atomic weights of every atom in its chemical formula, including groups in parentheses and hydrates.

Summary

Molar Mass Calculator is a free science utility by Zerethon Tools. Molar mass / molecular weight from a chemical formula (parentheses + hydrates) with a per-element breakdown. Client-side. Runs entirely in the browser — no signup, no upload.

Category
Science
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Molar Mass Calculator runs entirely client-side — no server upload, no logging, no tracking of your input.

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