How to use it
Write formulas with case-sensitive element symbols, numeric subscripts, parentheses, +, and one -> or → arrow. Select Balance. Read the balanced equation and atom check.
Method and worked example
Each compound becomes an element-count column. Exact rational row reduction finds a unique coefficient ratio; denominators are cleared and the integers reduced by their greatest common divisor. The final counts are checked independently on both sides.
Example
Fe + O2 → Fe2O3 becomes 4 Fe + 3 O2 → 2 Fe2O3.
Assumptions and limitations
Supports neutral molecular equations, nested parentheses, and one-dimensional positive solution spaces. It does not predict reactions, support ions/charges, hydrates, phase labels, electron transfer, pre-entered coefficients, or ambiguous multi-solution equations. This is not chemistry safety or laboratory handling guidance.
Privacy and accessibility
Calculations run in this browser session. This page does not send, store, or add your entered values to a URL. Controls work with a keyboard and results and errors are announced as text.