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Moles, solutions, balanced equations, gases, and decay, plus a periodic table to look things up.
Chemistry
Enter a chemical formula to get its molar mass and percent composition by element. Handles brackets and hydrates, using IUPAC standard atomic weights.
Open in Molecular Weight Calculator →Moles
Convert between grams, moles, and number of particles for any chemical formula, with the molar mass worked out for you.
Open tool →Chemistry
Calculate molarity from mass or moles of solute, solve for mass or volume, and work out dilutions with c₁V₁ = c₂V₂.
Open tool →Chemistry
Calculate molarity from mass or moles of solute, solve for mass or volume, and work out dilutions with c₁V₁ = c₂V₂.
Open in Molarity Calculator →Solutions
Work out a solution's concentration as % w/v, % w/w, % v/v, ppm, ppb, g/L, and molarity from the amounts of solute and solution.
Open tool →Reactions
Find the limiting reagent, theoretical yield, leftover excess reactants, and percent yield for any reaction, which is balanced for you first.
Open tool →Reactions
Balance chemical equations, including ionic and redox equations with charges, exactly, with an atom-by-atom check of both sides.
Open tool →Chemistry
Calculate pH, pOH, [H⁺] and [OH⁻] from any one of them, or from the concentration of a strong or weak acid or base (with Ka or Kb).
Open tool →Chemistry
Calculate pH, pOH, [H⁺] and [OH⁻] from any one of them, or from the concentration of a strong or weak acid or base (with Ka or Kb).
Open in pH Calculator →Gases
Solve PV = nRT for pressure, volume, moles, or temperature in any units including °C and °F, plus the combined gas law for changing conditions.
Open tool →Decay
Find the amount remaining, initial amount, time elapsed, or half-life for radioactive decay, and convert half-life to the decay constant.
Open tool →