Chemistry Calculators & Tools
Every tool is free, works without an account, and explains its steps — because the goal is to help you learn the method, not just get the number.
Reference & interactive
Formulas & composition
Molar Mass CalculatorCalculate the molar mass of any chemical formula with a full element-by-element breakdown and percent composition.Grams to Moles CalculatorConvert grams to moles (or moles to grams) for any formula — molar mass looked up automatically, steps shown.Chemistry Unit ConverterConvert temperature, pressure, volume, mass, moles, energy and concentration units.Percent Composition CalculatorFind the percent by mass of every element in a compound from its formula.Empirical Formula CalculatorTurn masses or percent composition into the simplest whole-number formula, step by step.
Reactions & gases
Percent Yield CalculatorCompare actual vs theoretical yield, or solve for either one from the percentage.Chemical Equation BalancerBalance any chemical equation instantly and check atom conservation on both sides.Stoichiometry CalculatorConvert between grams and moles of any two substances in a balanced equation using mole ratios.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature with automatic unit handling.Limiting Reactant CalculatorFind the limiting reactant, theoretical yield and leftover excess for any balanced reaction.
Solutions & acids
pH and pOH CalculatorConvert between pH, pOH, [H⁺] and [OH⁻], and see whether a solution is acidic, basic or neutral.Dilution Calculator (C₁V₁ = C₂V₂)Solve dilution problems with automatic unit conversion between M, mM, µM and L, mL, µL.Molarity CalculatorCalculate molarity, moles, volume, or concentration from mass — with steps shown.
Atomic structure
Electron Configuration CalculatorFind the full and noble-gas electron configuration, shell distribution and valence electrons of any element.Isotope Abundance CalculatorCalculate average atomic mass from isotope masses and abundances — or solve for a missing abundance.Oxidation Number CalculatorEstimate oxidation states for common compounds and ions using the standard rules, with each rule explained.
Frequently asked questions
Are Periodixy's chemistry calculators free?
Yes — every tool on Periodixy is completely free, with no account, sign-up, or download required.
Do the calculators show the working steps?
Yes. Each calculator explains the formula it used and walks through the substitution step by step, so you can learn the method — not just copy the answer.
Can I use these tools for homework and exam preparation?
That's exactly what they're for. Use them to check your manual work and understand each step. For graded work, follow your school's rules on tool use.