Arrhenius Equation Calculator — k = Ae^(−Ea/RT) Find a rate constant from the pre-exponential factor, activation energy, and temperature.
Average Atomic Mass Calculator Compute the weighted average atomic mass from isotopic masses and fractional abundances.
Buffer pH Calculator — Henderson–Hasselbalch Estimate buffer pH from pKa and the base-to-acid concentration ratio.
Calorimetry Calculator — q = CΔT Find heat exchanged using a calorimeter's heat capacity and measured temperature change.
Cell Potential Calculator — E°cell = E°cathode − E°anode Find the standard cell potential from the two half-cell reduction potentials.
Combined Gas Law Calculator — P₁V₁/T₁ = P₂V₂/T₂ Find the new pressure, volume, or temperature of a fixed amount of gas.
Dilution Calculator — M₁V₁ = M₂V₂ Find the final concentration or required volumes when diluting a stock solution.
Electrolysis Calculator — Faraday's Laws Find the mass deposited or liberated from current, time, and electrons per ion.
Empirical Formula Helper — mole ratio from percent composition Turn percent composition into a mole ratio to work out a compound's empirical formula.
Reaction Enthalpy Calculator — ΔH° from formation enthalpies Compute standard reaction enthalpy from summed formation enthalpies of products and reactants.
Equilibrium Constant Calculator — Kc Compute Kc from equilibrium concentrations and stoichiometric coefficients.
Gas Density Calculator — d = PM/RT Find a gas's density from its pressure, molar mass, and temperature.
Gibbs Free Energy Calculator — ΔG = ΔH − TΔS Predict reaction spontaneity from enthalpy, entropy, and absolute temperature.
Half-Life Calculator — t½ = ln2/k Relate the half-life and rate constant of a first-order process.
Heat Transfer Calculator — q = mcΔT Find heat absorbed or released from mass, specific heat, and temperature change.
Hydrogen & Hydroxide Ion Calculator from pH Find both [H⁺] and [OH⁻] in water from pH using the water ion product.
ICE Table Helper (1:1 reaction) Solve equilibrium concentrations for A ⇌ B from initial concentrations and Kc.
Ideal Gas Law Calculator — PV = nRT Solve for pressure, volume, moles, or temperature of a gas behaving ideally.
Isotope Abundance Calculator Find the percent abundance of an isotope from the average atomic mass (two-isotope system).
Ka ↔ Kb Converter — Ka·Kb = Kw Convert between the acid and base dissociation constants of a conjugate pair.
Limiting Reactant Calculator Compare mole-to-coefficient ratios to find the limiting reactant and leftover excess.
Mass Percent Calculator Find the mass percent of a solute in a solution from component masses.
Molality Calculator — m = n/kg solvent Find molality from moles of solute and kilograms of solvent.
Molar Mass Calculator — M = m/n Find the molar mass of a pure substance from a measured sample mass and its amount in moles.
Molar Volume Calculator — Vₘ = V/n Find the volume occupied by one mole of gas under given conditions.
Molarity Calculator — M = n/V Find molarity, moles of solute, or solution volume for a prepared solution.
Moles to Mass Converter Convert between grams and moles when the molar mass is already known.
Nernst Equation Calculator — E = E° − (0.0592/n)logQ Find the nonstandard cell potential at 25 °C from E°, electrons transferred, and Q.
Partial Pressure Calculator — Pᵢ = XᵢP Find a gas's partial pressure from its mole fraction and the total pressure.
Particles to Moles Calculator — N = n·Nₐ Convert between particle counts and moles using Avogadro's constant.
Percent Composition Calculator Find an element's mass percent in a compound from its atom count and molar masses.
Percent Yield Calculator Compare actual yield to theoretical yield to find reaction efficiency as a percent.
pH Calculator — pH = −log[H⁺] Convert between pH and hydrogen-ion concentration for aqueous solutions.
pOH Calculator — pOH = −log[OH⁻] Convert between pOH and hydroxide-ion concentration for aqueous solutions.
Rate Law Calculator — rate = k[A]ᵐ[B]ⁿ Compute a reaction rate from the rate constant, concentrations, and reaction orders.
Reaction Quotient Calculator — Q Compute Q from current concentrations to see which way a reaction will shift.
Scientific Notation Calculator Multiply or divide numbers written in scientific notation (a×10^m).
Significant Figures ↔ Uncertainty Estimator Relate a measurement's significant-figure count to its approximate relative uncertainty.
Solution Stoichiometry Calculator Go from solution concentration and volume straight to product mass via the mole ratio.
Theoretical Yield Calculator Predict the maximum product mass from the limiting reactant using stoichiometry.
Titration Equivalence Calculator — MₐVₐ = M_bV_b Find the unknown concentration or volume at the equivalence point of a 1:1 titration.
Molarity ↔ ppm Converter (dilute aqueous) Convert between molarity and parts-per-million for dilute water solutions.