Molar mass from a formula
Molar mass from a formula: calculate a transparent estimate from the values and assumptions you provide.
Your inputs stay in your browser. Displayed results are rounded to a maximum of 12 significant digits.
Method and assumptions
Method version 1.0.0 · Updated
Calculate
Formula: Sum of atomic masses according to formula subscripts
Molar mass from a formula: calculate a transparent estimate from the values and assumptions you provide.
- formula
- Chemical formula
Built-in atomic masses cover selected common elements; parentheses are supported, e.g. Ca(OH)2.
Calculate with code
These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.
JavaScript
const molarMassCaOH2 = 40.078 + 2 * (15.999 + 1.008); // 74.092 g/mol