Calculadora de Economia de Átomo
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
AE = (MM_produto / Σ MM_reagentes) × 100
About this calculator
The Atom Economy Calculator is a green chemistry tool that measures the efficiency of a chemical reaction. It calculates the percentage of atoms from reactants that end up in the desired product, ignoring byproducts. The higher the value, the more sustainable the process, as less waste is generated.
The calculation is simple: divide the molar mass of the desired product by the sum of the molar masses of all reactants and multiply by 100. For example, if the product molar mass is 100 g/mol and the sum of reactants is 200 g/mol, the atom economy is 50%. This means half of the atoms from reactants become product, and the rest becomes waste.
Use this calculator to compare synthetic routes in laboratories, pharmaceutical or chemical industries. It helps choose cleaner processes, reducing disposal costs and environmental impact. It is especially useful in organic syntheses where byproducts are common.
Caution: atom economy does not consider solvents, catalysts, or actual reaction yield. It is a theoretical maximum indicator. For a complete analysis, combine with the E-factor (mass of waste per mass of product) and reaction mass efficiency.
Frequently asked questions
What is the difference between atom economy and yield?
Atom economy is theoretical (based on stoichiometry), while yield is practical (measures how much product was obtained experimentally). A reaction can have high yield but low atom economy if it generates many byproducts.
Can I use the calculator for reactions with more than one desired product?
No, atom economy considers only one desired product. If there are multiple useful products, calculate separately or use metrics like reaction mass efficiency.
What does 100% atom economy mean?
It means all atoms from reactants are incorporated into the desired product, with no byproducts. Classic example: addition reactions (A + B → C).
Does the calculator consider water or solvents?
No. Traditional atom economy only includes reactants that appear in the balanced equation. Solvents and catalysts are not counted, but they should be minimized for sustainability.
How do I calculate the required molar mass?
Sum the atomic masses of each element in the molecular formula. Use the periodic table. Our calculator does not include this sum; you need to enter already calculated values.