⚗️ Chemistry Calculators

Molar mass, moles, molarity, dilution, pH, ideal gas law, percent yield and half-life, with worked examples.

Dilution CalculatorSolve C1V1 = C2V2 for any value and see exactly how much stock solution and water to mix. Supports M, mM, µM and percent, in liters, milliliters or microliters.Half-Life CalculatorSolve N = N₀ × (1/2)^(t / t½) for the amount remaining, elapsed time, half-life or starting amount. Includes the decay constant and presets for carbon-14, iodine-131, uranium-238 and radon-222.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature. Mix units freely: atm, kPa, Pa, mmHg, bar, psi; L, mL, m³; K, °C, °F. Shows the R value and steps.Molar Mass CalculatorType a chemical formula like H2O, Ca(OH)2, Fe2(SO4)3 or CuSO4·5H2O and get the molar mass in g/mol plus an element-by-element breakdown with mass percent.Molarity CalculatorCalculate molarity (M = mol/L), or solve for moles, solution volume, or the grams of solute needed to make a solution. Works in liters or milliliters, with steps shown.Mole CalculatorConvert grams to moles, moles to grams, and moles to molecules or atoms with Avogadro's number. Type a chemical formula or enter the molar mass, and see every step.Percent Yield CalculatorCalculate percent yield from actual and theoretical yield, or work out the theoretical yield first from the limiting reactant's mass, molar masses and the mole ratio in the balanced equation.pH CalculatorConvert between pH, pOH, hydrogen ion and hydroxide ion concentration at 25 °C. Also finds the pH of strong acids, strong bases and weak acids from concentration and Ka.