Explore our collection of chemistry calculators organized by subcategory.
Calculate number of moles from mass and molar mass.
Calculate molarity (concentration) of solutions.
Calculate molality (moles per kg solvent).
Calculate reactant and product amounts in chemical reactions.
Calculate percent composition by mass of elements in compounds.
Calculate empirical formula from percent composition.
Calculate the molecular formula from an empirical formula and molecular mass. Enter an empirical formula (e.g., CH2O) and the molecular mass in g/mol to determine the molecular formula and element breakdown.
Calculate solution concentration in various units (M, g/L, % w/v, ppm) from solute mass, solution volume, and molar mass.
Calculate dilution volumes for solutions using the dilution equation C1V1 = C2V2.
Calculate pH and pOH of aqueous solutions from hydrogen ion concentration (H+). Assumes Kw = 1e-14 at 25°C.
Calculate buffer pH using Henderson-Hasselbalch equation for solutions. Input pKa and concentrations of conjugate base [A-] and weak acid [HA] to compute pH or pOH.
Calculate titration volumes and equivalence points for monoprotic acid-base titrations.
Calculate enthalpy change in chemical reactions. Enter total heat (J) and moles to get ΔH in J/mol or kJ/mol.
Calculate entropy change.
Calculate Gibbs free energy using ΔG = ΔH - TΔS with enthalpy (kJ/mol), entropy (J/mol·K), and temperature (K).
Calculate reaction rates and rate constants.
Calculate equilibrium constant (K) for reactions.
Calculate bond energy totals and reaction enthalpy (ΔH) from lists of bonds broken and formed. Enter bond energies as comma-separated values (kJ/mol).