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Molar mass calculator — molecular weight and mass percent from a formula

Enter a formula such as H2SO4, Ca(OH)2 or CuSO4·5H2O to get the molar mass, mass percent of each element and the working, and convert grams to moles.

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How to use

1
Type the formula (case-sensitive).
2
Read the molar mass and percentages.
3
Convert grams ↔ moles.

When to use it

Homework

Molar mass with steps.

Lab prep

Grams for 0.1 mol.

Composition

Mass percent by element.

Good to know

Co is cobalt; CO is carbon monoxide.
Write hydrates with · or *.
Numbers after brackets multiply the group.

FAQ

Different from my textbook?

Textbooks may round atomic masses.

Concentration?

Divide moles by volume.

Ions?

Charges like ^2- are ignored.

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