Calculate the simplest whole-number ratio of atoms in a compound from elemental percentages. Real-time results with step-by-step calculations.
Real-time calculation activeEnter elemental percentages and click "Calculate Empirical Formula" to see results
This empirical formula calculator helps you determine the simplest whole-number ratio of atoms in a chemical compound based on its elemental composition. Follow these steps to use the tool effectively:
For each element in your compound, enter its symbol (e.g., C for carbon, H for hydrogen) and its percentage composition. You can add more elements using the "Add Element" button.
The sum of all percentage values should ideally be 100%. The calculator will show a warning if the total deviates significantly from 100%.
Click the "Calculate Empirical Formula" button. The tool will instantly compute and display the empirical formula along with detailed step-by-step calculations.
Review the empirical formula, elemental composition table, and calculation steps. You can export results or try sample data for practice.
An empirical formula represents the simplest whole-number ratio of elements in a compound. It differs from the molecular formula, which shows the actual number of atoms in a molecule.
| Compound | Molecular Formula | Empirical Formula |
|---|---|---|
| Hydrogen Peroxide | H₂O₂ | HO |
| Glucose | C₆H₁₂O₆ | CH₂O |
| Benzene | C₆H₆ | CH |
For best results with this chemical formula calculator, ensure your percentage values are accurate and sum to 100%. The tool automatically adjusts for rounding errors and provides the simplest whole-number ratio.