⚗️ Chemistry Calculators & Interactive Periodic Table
From the periodic table to reaction kinetics: compute molar masses, balance equations, prepare solutions, analyse gases and acids, and explore all 118 elements. Atomic masses follow IUPAC standard atomic weights.
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- Interactive Periodic Table of ElementsInteractive periodic table with all 118 elements: atomic number, atomic mass, electron configuration, electronegativity, category and state.
- Molar Mass CalculatorCalculate the molar mass (molecular weight) of any chemical formula with element-by-element mass composition. Supports brackets and hydrates.
- Chemical Equation BalancerBalance chemical equations automatically, including ionic and redox equations with charges and electrons.
- Empirical & Molecular Formula CalculatorFind the empirical formula from mass percentages (or masses) and the molecular formula from the molar mass.
- Electron Configuration CalculatorGet the ground-state electron configuration, noble-gas notation and valence electrons of any element.
- Mass, Moles & Particles CalculatorConvert between mass, moles and number of particles using molar mass and Avogadro's number.
- Molarity CalculatorMolar concentration: find molarity, solute mass or solution volume (any two given).
- Dilution CalculatorSolve the dilution equation C₁V₁ = C₂V₂ for any missing value; works with any consistent units.
- Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature.
- Combined Gas Law CalculatorSolve P₁V₁/T₁ = P₂V₂/T₂ (Boyle's, Charles's and Gay-Lussac's laws) for the missing value.
- Percent Yield CalculatorPercent yield from actual and theoretical yield.
- Beer–Lambert Law CalculatorAbsorbance, transmittance, molar absorptivity, path length or concentration from A = εlc.
- pH CalculatorConvert between pH, pOH, [H⁺] and [OH⁻] at 25 °C; also estimates pH of weak acids from Ka.
- Weak Acid / Base pH CalculatorpH of a weak acid or weak base solution from its concentration and Ka/Kb (or pKa/pKb), solved exactly.
- Buffer pH CalculatorpH of a buffer solution from pKa and the concentrations of conjugate base and acid.
- Half-Life & Radioactive Decay CalculatorRemaining quantity, elapsed time or half-life for exponential decay (radioactive isotopes, drugs, first-order reactions).
- Gibbs Free Energy CalculatorΔG = ΔH − TΔS: spontaneity, equilibrium constant and crossover temperature.
- Arrhenius Equation CalculatorRate constant at a new temperature or activation energy from two rate constants (Arrhenius equation).
- Nernst Equation CalculatorCell or electrode potential under non-standard conditions with the Nernst equation.
- Mass Percent & Solution Concentration CalculatorMass percent (w/w), ppm and molality of a solution from solute and solvent masses.