Chemistry Calculators Calculators
Molar mass, molarity, pH, gas laws, half-life, specific heat and more — free calculators for chemistry students and professionals.
Enter the number of atoms of each element in your compound to instantly calculate the molar mass (molecular weight) in grams per mole.
Calculate molarity (concentration in mol/L) from the mass of solute, its molar mass, and the volume of solution.
Enter the H⁺ concentration as a power of 10 to calculate pH, pOH, and [OH⁻]. Or enter pH directly to find the concentrations.
Use PV = nRT to find any one of pressure, volume, moles or temperature when the other three are known.
Find the final volume or amount of solvent to add when diluting a stock solution using the dilution equation C₁V₁ = C₂V₂.
Calculate how much of a radioactive substance remains after elapsed time using N(t) = N₀ × (½)^(t÷t½).
Calculate the heat energy transferred when a substance changes temperature using Q = mcΔT — the fundamental calorimetry equation.
Calculate the percent yield of a chemical reaction — how efficient your synthesis was — by comparing actual to theoretical yield.
At constant temperature, pressure and volume are inversely proportional. Enter initial conditions and new pressure to find new volume.
At constant pressure, gas volume is directly proportional to absolute temperature (in Kelvin). Find the new volume after a temperature change.
Calculate the pH of a buffer solution from pKa and acid/conjugate base concentrations using the Henderson-Hasselbalch equation.
Normality (N) is the number of gram-equivalents of solute per litre. Used in acid-base and redox titrations.