Molecular Weight Calculator
Add the atomic mass of each element multiplied by its count in the formula.
This calculator is free to use. Enable JavaScript to enter your values and see a result instantly.
How it works
Add the atomic mass of each element multiplied by its count in the formula.
Worked example
H₂O has two hydrogen atoms and one oxygen atom, totaling about 18.015 g/mol.
Keep in mind
This tool supports common elements and formulas without parentheses.