Chemical equation balancer
Type a chemical equation, like C3H8 + O2 = CO2 + H2O, and get the smallest whole-number coefficients that balance the reaction, with an atom count check for each element.
How to useBalance chemical equations
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Chemical equation balancer: what it is for
Write the equation with the formulas of the reactants and products, separated by + and by = or ->. The tool uses the algebraic method with exact fractions to find the smallest whole-number coefficients that leave the same number of atoms of each element on both sides, including redox reactions like permanganate with hydrochloric acid. A table checks the count of each element.
The calculations run in your browser, with IUPAC standard atomic masses.
How to use
- Type the equation without coefficients.
- See the balanced equation.
- Check the atom count and copy the result.
When to use it
- Study for chemistry exams.
- Check chemistry homework.
- Set up stoichiometry calculations.
Frequently asked questions
How do I type the equation?
Separate substances with + and reactants from products with = or ->. Write formulas with the correct upper and lower case, like Fe2O3 and Cu(NO3)2. You don't need to add coefficients.
What method does the tool use?
The algebraic method: it sets up a system with one equation per element, making sure the number of atoms is the same on both sides, and solves it with exact fractions to find the smallest whole-number coefficients.
Why won't the equation balance?
There may be an error in a formula, an element that appears on one side only, or an equation that mixes two independent reactions. Ionic equations with charges are not supported yet.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.