Chemistry Calculators
Last updated: October 2026
Chemical Reaction Yield Calculator
Compute the theoretical yield (in grams) of a chemical reaction from the limiting reactant’s mass, the reactant and product molar masses, and the stoichiometric ratio.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, temperature or moles of an ideal gas.
Half-Life Calculator
Find how much of a radioactive substance (or any first-order decay) remains after a given time from its half-life, using N = N₀ × (1/2)^(t / t½).
Molecular Weight Calculator
Compute the molecular weight (molar mass, g/mol) of a carbon-hydrogen-oxygen-nitrogen compound from its atom counts, with natural-abundance, monoisotopic, ¹³C-labelled or deuterated masses.
Molarity to Molality Converter
Convert solution molarity (mol/L of solution) to molality (mol/kg of solvent) from the solution density and the molar mass of the solute.
Solution Dilution Calculator
Find the concentration of a solution after dilution with C₁V₁ = C₂V₂, from the stock concentration, the volume of stock used and the final volume.
pH and pOH Calculator
Convert hydrogen ion concentration into pH or pOH, with an activity correction for ionic strength and the temperature dependence of water's ion product Kw.
Buffer Capacity Calculator
Calculate the buffer capacity (β) of a weak acid / conjugate base buffer from the two concentrations, using the Van Slyke equation.
Osmotic Pressure Calculator
Calculate the osmotic pressure of a solution using the van't Hoff equation.
Molarity Calculator
Find the molarity (mol/L) of a solution from the mass of solute, its molar mass and the solution volume, for preparing reagents, buffers and standards.