chemistry Calculators
Last updated: May 2026
Molarity Calculator
Calculate molar concentration (molarity, M) of a solution from moles of solute and total solution volume in litres.
Molecular Weight Calculator
Compute the molecular weight (molar mass, g/mol) of a CHON-containing molecule from the number of carbon, hydrogen, oxygen, and nitrogen atoms in its formula, with an optional isotope-correction factor.
Ideal Gas Law Calculator
Solve the ideal gas equation PV = nRT for whichever variable you need — pressure, volume, temperature, or moles — given the other three.
pH Calculator
Convert hydrogen ion concentration [H⁺] in mol/L into a pH value using pH = −log₁₀[H⁺].
Solution Dilution Calculator
Finds the final concentration of a solution after adding solvent, using the dilution equation C₁V₁ = C₂V₂.
Percent Composition Calculator
Find the mass percentage of any element in a compound.
Density Calculator
Calculate the density of any substance by entering its mass and volume.
Moles to Grams Calculator
Convert any amount in moles to grams using the substance's molecular weight.
Boyle's Law Calculator
Find the final pressure of a gas after compression or expansion using Boyle's Law.
Charles's Law Calculator
Determine the final volume of a gas after a temperature change using Charles's Law.
Normality Calculator
Calculate the normality of a solution by dividing gram equivalents of solute by solution volume.
Parts Per Million Calculator
Calculate the concentration of a solute in parts per million (ppm) by mass.
Avogadro's Number Calculator
Convert moles of a substance into the actual number of particles using Avogadro's number.
Heat Capacity Calculator
Calculate the heat energy absorbed or released by a substance using its mass, specific heat capacity, and temperature change.
Molarity to Molality Converter
Convert solution molarity to molality using the solution density and solute molar mass.
Half-Life Calculator
Determine how much of a radioactive substance remains after a given time.
Buffer pH Calculator
Compute the pH of a buffer solution from its pKa and conjugate acid/base concentrations.
Osmotic Pressure Calculator
Calculate the osmotic pressure of a solution using the van't Hoff equation.
Reaction Quotient Calculator
Find the reaction quotient Q by dividing product concentration by reactant concentration.
Activation Energy Calculator
Calculate the activation energy of a chemical reaction from rate constants at two temperatures using the Arrhenius equation.
Molarity Calculator
Computes the molarity of a solution from the mass of solute, its molecular weight, and the solution volume.
Stoichiometry Calculator
Determine the theoretical and actual yield of a chemical reaction from reactant mass, molecular weights, stoichiometric ratio, and percent yield.
Buffer Calculator
Calculate the pH of a buffer solution using the Henderson-Hasselbalch equation, with an ionic strength correction for more accurate real-world results.
Atomic Mass Calculator
Calculate the average atomic mass of an element from the masses and natural abundances of its isotopes.
Equilibrium Constant Calculator
Calculates the equilibrium constant Kc from product and reactant concentrations for a simplified 1:1 stoichiometry reaction.
Molarity and Dilution Calculator
Calculate the final molarity after diluting a stock solution by entering initial molarity, initial and final volumes, and a solvent type factor.
pH and pOH Calculator
Convert hydrogen ion concentration, hydroxide ion concentration, temperature, and ionic strength into pH and pOH values.
Molecular Weight Calculator
Calculate the molar mass of a compound from its atomic composition, then find moles from a weighed sample.
Beer-Lambert Law Calculator
Determine the concentration of a solution from its measured absorbance, extinction coefficient, and path length using Beer-Lambert law.
Chemical Equilibrium Calculator
Compute equilibrium concentrations using the ICE table method for simple chemical reactions.
Half-Life and Radioactive Decay Calculator
Determine how much of a radioactive substance remains after any period of time, or back-calculate the half-life from measured decay data.
Enthalpy Change Calculator
Compute the molar enthalpy change (ΔH) of a chemical reaction from calorimetry data — mass, specific heat, temperature change, and moles of reactant.
pH Buffer Calculator
Calculate the pH of a weak acid–conjugate base buffer solution using the Henderson-Hasselbalch equation, with corrections for temperature and ionic strength.
Ideal Gas Law Calculator
Solve for pressure, volume, temperature, or moles of a gas using the ideal gas law.
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.
Equilibrium Constant Calculator
Compute the equilibrium constant Kc from measured product and reactant concentrations for a reversible reaction.
Molecular Weight Calculator
Find the molecular weight of a compound by entering the number of carbon, hydrogen, oxygen, and nitrogen atoms.
Beer-Lambert Law Calculator
Find the concentration of a solution from its absorbance, molar extinction coefficient, and path length using Beer-Lambert law, with optional temperature correction.
Buffer Capacity Calculator
Calculate the buffer capacity (β) of an acid-base buffer system using the Henderson-Hasselbalch framework.
Reaction Kinetics Calculator
Determine reactant concentration at any point in time for zero, first, or second-order reactions.
Thermodynamics and Enthalpy Calculator
Calculate Gibbs free energy and enthalpy changes for chemical reactions.