Stoichiometry & Chemical Calculator

Reaction Input

Enter an unbalanced chemical equation using standard notation (e.g., H2 + O2 -> H2O).

Examples

Species Analysis

Proportional mass and mole relationships across the reaction.

Laboratory Mix Mode

Species	Coef	Molar Mass	Moles (n)	Mass (g)	Excess

Quick Summary

Limiting Reactant

Theoretical Mass Yield

Mass Conservation

Total Atom Count

Composition Legend

Reference calculation only - verify before use

This calculator produces stoichiometric estimates from the formulas and masses you enter. It does not account for reagent purity, hydration state, solvent effects, incomplete reactions, side reactions, catalyst requirements, thermodynamic feasibility, kinetics, safety hazards, waste disposal, or analytical measurement uncertainty.

Balanced equations are computed by null-space linear algebra and may not reflect the chemically preferred pathway for redox or multi-step reactions. Under-determined systems yield one valid balance out of infinitely many.

No warranty or liability. The tool is provided as-is. The author and maintainers accept no responsibility or liability for any error, miscalculation, unsafe preparation, wasted reagents, failed experiment, regulatory exposure, injury, or other consequence arising from use of this tool or its output. Verify all calculations against peer-reviewed references, analytical data, and Safety Data Sheets before use in any laboratory, production, or compliance context.