Chemistry Calculators71 calculators
Chemistry can be complex, but the right calculator can turn a challenge into a quick solution. This collection is designed for real-world use in classrooms and labs, from balancing equations to checking pH or finding molar mass. Students find help with homework and lab reports, while researchers save time on common calculations. Each calculator tackles a specific problem faced in chemistry classes or experiments, letting you focus on the science itself instead of manual math. Take a look through the tools here and see how much simpler chemistry can be when the calculations are handled for you.
Acids/Bases
Buffer Solution Calculator
Calculate the pH of a buffer solution using the Henderson-Hasselbalch equation: pH = pKa + log([A⁻]/[HA]).
Henderson-Hasselbalch Calculator
Calculate buffer pH using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Determine pH from pKa and conjugate acid/base concentrations.
pH Calculator
Calculate pH, pOH, hydrogen ion concentration [H+], and hydroxide ion concentration [OH-]. Convert between all four values.
Saponification Calculator
Calculate the amount of NaOH or KOH needed for soap making based on oil type, weight, and superfatting percentage.
Titration Calculator
Calculate unknown concentration, volume, or molarity from titration data using C_a × V_a × n_a = C_b × V_b × n_b.
Atomic Structure
Average Atomic Mass Calculator
Calculate the weighted average atomic mass of an element from its isotope masses and natural abundances.
Electron Affinity Calculator
Look up electron affinity values for common elements and calculate the energy change when an atom gains electrons.
Electron Configuration Calculator
Determine the full and noble gas shorthand electron configuration for any element (atomic numbers 1-118) using the aufbau principle.
Formal Charge Calculator
Calculate the formal charge on an atom in a Lewis structure from valence electrons, lone pairs, and bonds.
Oxidation Number Calculator
Determine oxidation states for elements in common compounds and ions based on standard rules.
Electrochemistry
Electrochemical Cell Voltage Calculator
Calculate the standard cell potential from half-cell reduction potentials: E°_cell = E°_cathode - E°_anode.
Lattice Energy Calculator
Estimate lattice energy of ionic compounds using the Born-Lande equation with Madelung constant and ion charges.
Nernst Equation Calculator
Calculate cell potential under non-standard conditions using the Nernst equation: E = E° - (RT/nF)ln(Q).
Standard Electrode Potential Calculator
Calculate cell potential E°cell from half-reaction potentials, ΔG°, spontaneity, and equilibrium constant for electrochemical cells.
Gases
Boyle's Law Calculator
Calculate pressure or volume changes using Boyle's Law (P₁V₁ = P₂V₂) for gases at constant temperature.
Charles's Law Calculator
Calculate volume or temperature changes using Charles's Law (V₁/T₁ = V₂/T₂) for gases at constant pressure.
Dalton's Law Calculator
Calculate total pressure or partial pressures of gas mixtures using Dalton's Law of Partial Pressures.
Gas Stoichiometry Calculator
Calculate the volume of a gas at STP or any temperature and pressure using the ideal gas law (PV = nRT).
Henry's Law Calculator
Calculate gas solubility in liquids using Henry's Law: C = k_H × P, where C is concentration and P is partial pressure.
Ideal Gas Law Calculator
Calculate pressure, volume, moles, or temperature using the ideal gas law PV = nRT.
Osmotic Pressure Calculator
Calculate osmotic pressure using the van't Hoff equation: π = iMRT.
Raoult's Law Calculator
Calculate vapor pressure of solutions using Raoult's Law: P_solution = x_solvent × P°_solvent.
Vapor Pressure Calculator
Calculate vapor pressure at a given temperature using the Clausius-Clapeyron equation or Antoine equation parameters.
Kinetics & Reactions
Activation Energy Calculator
Calculate activation energy, rate constant, or temperature using the Arrhenius equation: k = A·exp(-Ea/RT).
Arrhenius Equation Calculator
Calculate rate constants, activation energy, or temperature using the Arrhenius equation k = Ae^(-Ea/RT). Supports single-point and two-point calculations.
Equilibrium Constant Calculator
Calculate Kc, Kp, or convert between them. Find equilibrium constants from concentrations or pressures, and compute ΔG°.
Reaction Rate Constant Calculator
Calculate reaction rate, rate constant, or concentration for zero, first, and second order reactions.
Solubility Product Calculator
Calculate Ksp from molar solubility or find molar solubility from Ksp. Supports common ion effect for salts of type AB, A2B, AB2, and A3B.
Nuclear
Solutions
Bleach Dilution Calculator
Calculate how much bleach to add to water for a desired sodium hypochlorite concentration. Supports household and industrial bleach strengths.
Concentration Converter Calculator
Convert between concentration units: molarity, mass percent, ppm, ppb, and mg/L. Uses molecular weight and solution density for accurate conversions.
Dilution Calculator
Calculate dilution using the C1V1 = C2V2 equation. Solve for any of the four variables.
Dilution Factor Calculator
Calculate the dilution factor for simple and serial dilutions. Find final concentration from initial concentration and dilution steps.
Dilution Ratio Calculator
Calculate dilutions for cleaning solutions and chemicals. Convert between ratios (1:X) and concentrations. Find concentrate and diluent volumes.
Ion Concentration Calculator
Calculate individual ion concentrations and ionic strength from dissolved salts in solution.
Mass Percent Calculator
Calculate mass percent (weight percent) of a solute in a solution: mass% = (mass of solute / mass of solution) × 100.
Molality Calculator
Calculate molality (m), moles of solute, or mass of solvent using the formula m = moles / kg solvent.
Molarity Calculator
Calculate molarity (M), moles, or volume using the formula M = moles / liters. Solve for any variable.
Mole Fraction Calculator
Calculate mole fractions of components in a mixture. Supports 2 or 3 component mixtures with verification that fractions sum to 1.
Serial Dilution Calculator
Calculate concentrations at each step of a serial dilution. Find final concentration, total dilution factor, and volumes needed.
Solution Preparation Calculator
Calculate how much solute to weigh and solvent to add to prepare a solution of desired molarity and volume.
Water Hardness Calculator
Convert water hardness between ppm, gpg, mmol/L, dGH, and Clark degrees. Classify water as soft, moderately hard, hard, or very hard.
Water Potential Calculator
Calculate water potential using the equation Ψ = Ψs + Ψp. Find solute potential with the van't Hoff equation Ψs = -iCRT.
Stoichiometry
Avogadro's Number Calculator
Convert between moles, particles, and grams using Avogadro's number (6.022 × 10²³).
Combustion Analysis Calculator
Determine the empirical formula of an organic compound from combustion analysis data (CO₂ and H₂O produced).
Empirical Formula Calculator
Determine the empirical formula of a compound from percent composition or mass data of its elements.
IUPAC Nomenclature Calculator
Apply IUPAC nomenclature rules to a simple open-chain organic compound. Returns the systematic name, parent chain stem, numbered locants, and the root-plus-suffix breakdown.
Limiting Reagent Calculator
Determine the limiting reagent, excess reagent, and theoretical yield from moles or grams of two reactants.
Molar Mass Calculator
Calculate the molar mass of a compound from element counts. Enter the number of atoms for each element and get the total mass in g/mol.
Molar Volume Calculator
Calculate molar volume of a gas at STP or any temperature and pressure using the ideal gas law.
Mole Calculator
Convert between moles, grams, and number of particles. Calculate any value given the other two.
Molecular Formula Calculator
Determine the molecular formula from an empirical formula and experimental molar mass.
Molecular Weight Calculator
Calculate the molecular weight (molar mass) of common compounds or custom molecules by entering element counts.
Percent Composition Calculator
Calculate the percent composition by mass of each element in a compound using atomic masses and the molecular formula.
Percent Purity Calculator
Calculate the percent purity of a substance from direct mass measurements or from titration data.
Percent Yield Calculator
Calculate percent yield from actual yield and theoretical yield. Assess how efficient your reaction was.
Reaction Yield Calculator
Calculate percent yield, actual yield, or theoretical yield: % yield = (actual / theoretical) × 100.
Stoichiometry Calculator
Calculate reactant or product quantities using mole ratios from balanced chemical equations.
Theoretical Yield Calculator
Calculate the theoretical yield of a chemical reaction from reactant mass, molar masses, and the mole ratio.
Thermochemistry
Beer-Lambert Law Calculator
Calculate absorbance, concentration, molar absorptivity, or path length using the Beer-Lambert law: A = εbc. Also computes transmittance.
Boiling Point Elevation Calculator
Calculate the boiling point elevation of a solution using ΔTb = i × Kb × m. Supports water, ethanol, benzene, and custom solvents.
Bond Energy Calculator
Estimate reaction enthalpy from bond energies. ΔH = Σ(bonds broken) - Σ(bonds formed). Enter bond types and counts for reactants and products.
Calorimetry Calculator
Calculate heat absorbed or released using q = mcΔT. Supports common substances with preset specific heat values.
Colligative Properties Calculator
Calculate boiling point elevation, freezing point depression, and vapor pressure lowering for solutions.
Enthalpy Calculator
Calculate the heat of reaction (q = mcΔT), enthalpy change, or calorimetry results for chemical reactions.
Entropy Change Calculator
Calculate entropy change (ΔS) for phase changes, temperature changes, and ideal mixing. Assess spontaneity using the second law of thermodynamics.
Freezing Point Depression Calculator
Calculate the freezing point depression of a solution using ΔTf = i × Kf × m. Supports water, benzene, cyclohexane, and custom solvents.
Gibbs Free Energy Calculator
Calculate Gibbs free energy using ΔG = ΔH - TΔS to determine reaction spontaneity.
Hess's Law Calculator
Calculate reaction enthalpy from formation enthalpies using Hess's Law: ΔH_rxn = Σ(ΔHf products) - Σ(ΔHf reactants).
Photon Energy Calculator
Calculate the energy of a photon from its wavelength or frequency using E = hf = hc/λ.