What this calculator does
Atom economy works out share of reactant mass that ends up in the desired product versus all products formed. 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
FormulaAtom economy = molar mass(desired product) / Σ molar mass(all products) × 100 (Trost, 1991)
The inputs explained
| Field | What to enter |
|---|---|
| Molar mass of desired product (g/mol) | A number, measured in g/mol. Starts at 44.05. |
| Molar mass of each by-product (comma-separated) | A list of numbers, separated by commas or spaces. |
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 molar mass of desired product
Every other input is held at the calculator’s starting values while molar mass of desired product varies. Select any row to load that scenario into the calculator.
How the answer changes with molar mass of desired product