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Chemical Equation Balancer

Type an unbalanced equation and get the smallest whole-number coefficients that balance it.

Type an equation, e.g. Fe + O2 = Fe2O3
Read the balanced equation instantly

Runs entirely in your browser — solved with exact fractions, no floating-point rounding.

Unbalanced equation — use + between compounds and = or -> between sides

4Fe + 3O2 → 2Fe2O3

Supports parentheses (e.g. Ca(OH)2) and multi-element formulas. Solves for the smallest whole-number coefficients using exact fraction arithmetic — no floating-point rounding. Runs entirely in your browser.