Molecular Weight Calculator

Enter formulas such as H2O, Ca(OH)2, or CuSO4·5H2O to calculate molar mass and an element-by-element breakdown.

Chemical formula

Examples

—Molar mass in grams per mole.

How to use this Molecular Weight Calculator

Calculate molecular weight or molar mass from a chemical formula. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.