What this calculator does
Grams to moles works out converts a mass in grams to an amount in moles using the substance’s molar mass. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
Formulan = m / M, where m is mass in grams and M is molar mass in g/mol
The inputs explained
| Field | What to enter |
|---|---|
| Mass (g) | A number, measured in g. Starts at 18. |
| Molar mass (g/mol) | A number, measured in g/mol. Starts at 18.02. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with mass
Every other input is held at the calculator’s starting values while mass varies. Select any row to load that scenario into the calculator.