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Molar mass calculator

Enter a formula to see its approximate mass in grams per mole, with a breakdown by element. Parentheses and subscript digits are supported.

Available elements: H, B, C, N, O, F, Al, Si, P, S, Cl, As, Se, Br, I, Xe. For formulas outside this set, the calculator will explain the limit.

MOLAR MASSEnter a formula.

Calculated using abridged standard atomic weights.

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Compare 175 molecules ↗

What the result means

Molar mass is the sum of the atomic weights in the written formula. Values here use CIAAW abridged standard atomic weights and are rounded to two decimal places. Natural isotope variation can affect the last digits.

ISPOLAR / ELEMENT ATLAS

Explore the elements

Select an element to inspect its electron configuration and reported properties.

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