What is this calculator?
Sum atomic masses in a simple chemical formula.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Sum atomic masses in a simple chemical formula.
How to use it
- Enter chemical formula.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Molar mass = Σ atomic mass × atom count
Parentheses multiply an entire group. The supported common-element table is stored with the calculator.
Worked example
Chemical formula: H2O. The result is 18.015 g/mol (molar mass).
Assumptions and limits
Supports common elements and nested parentheses. No isotopic labels or hydrate dot notation.
Frequently asked questions
What inputs does the Molecular Weight Calculator need?
Use chemical formula. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Molecular Weight Calculator?
Supports common elements and nested parentheses. No isotopic labels or hydrate dot notation.