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Chemistry
Chemistry Calculators
24 free chemistry calculators with clear, detailed guides.
All Chemistry Calculators
Activation Energy & Arrhenius Equation Calculator
Calculate activation energy from rate constant data using the Arrhenius equation. Find how temperature affects reaction rate and the rate constant at any.
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Beer-Lambert Law Calculator — Absorbance & Concentration
Calculate absorbance, transmittance, and concentration using the Beer-Lambert Law (A = εcl). Used in colorimetry, spectrophotometry, and analytical chemistry.
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Colligative Properties Calculator
Calculate freezing point depression, boiling point elevation, osmotic pressure, and vapour pressure lowering for any solution concentration.
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Combined Gas Law Calculator (P, V, T)
Calculate pressure, volume, or temperature changes for an ideal gas using the combined gas law. Boyle's, Charles', Gay-Lussac's laws unified.
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Electrochemical Cell Voltage Calculator
Calculate standard cell potential (EMF) from electrode potentials. Determine if a redox reaction is spontaneous and find the cell notation.
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Electroplating & Electrolysis Calculator
Calculate mass deposited during electrolysis using Faraday's laws. Find current, time, or mass for any electroplating or electrolysis process.
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Empirical & Molecular Formula Calculator
Calculate the empirical formula from percentage composition or masses of elements. Find the molecular formula from empirical formula and molar mass.
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Enthalpy & Hess's Law Cycle Calculator
Calculate enthalpy change using Hess's Law from formation or combustion enthalpies, and from bond energies. Essential for A-level chemistry thermochemistry.
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Enthalpy Change & Hess's Law Calculator
Calculate enthalpy changes for combustion, neutralisation, and solution reactions. Apply Hess's Law to find enthalpy changes for reactions you cannot.
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Gas Stoichiometry & Molar Volume Calculator
Calculate volumes of gases in chemical reactions using stoichiometry and the molar volume at STP and RTP. Convert between moles, mass, and gas volume.
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Gibbs Free Energy Calculator (ΔG = ΔH − TΔS)
Calculate Gibbs free energy change using ΔG = ΔH − TΔS. Determine reaction spontaneity, find the temperature at which a reaction becomes spontaneous, and.
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Ideal Gas Law Calculator
Calculate pressure, volume, temperature, or moles of gas using the ideal gas law PV = nRT. Solve for any variable.
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Ideal Gas Laws Calculator (Boyle, Charles, Gay-Lussac, Combined)
Apply Boyle's Law, Charles' Law, Gay-Lussac's Law, and the combined ideal gas law PV=nRT. Find any unknown gas variable.
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Kinetic Theory of Gases Calculator — RMS Speed
Calculate RMS speed, average kinetic energy, and pressure from kinetic theory. Find Maxwell-Boltzmann gas particle velocities at any temperature.
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Molar Mass Calculator
Calculate the molar mass of any chemical compound by entering its formula. Supports all elements with atomic weights from the periodic table.
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Molarity & Solution Concentration Calculator
Calculate molarity, moles, mass, or volume for any solution. Convert between molarity, molality, and percent concentration.
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Nernst Equation & Cell Potential Calculator
Calculate non-standard cell potential using the Nernst equation. Find electrode potential at any concentration, temperature, and number of electrons.
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Reaction Order & Rate Law Calculator
Determine reaction order from concentration-time data. Calculate rate constants for zero, first, and second order reactions from experimental data.
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Solubility Product (Ksp) Calculator
Calculate the solubility product constant Ksp, molar solubility, and ion concentrations for sparingly soluble ionic compounds. Includes common ion effect.
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Theoretical & Percentage Yield Calculator
Calculate theoretical yield, actual yield, and percentage yield for any chemical reaction. Includes atom economy and mass of reactant needed.
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Titration Calculator — Find Unknown Concentration
Calculate unknown acid or base concentration from titration data. Works for strong acid/base, back titrations, and redox titrations.
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pH & Buffer Solution Calculator
Calculate pH of acids, bases, and buffer solutions using Henderson-Hasselbalch. Find buffer capacity and ratios for common chemistry applications.
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pH Calculator
Calculate pH from hydrogen ion concentration, pOH, or Ka. Convert between pH, pOH, H+ concentration, and OH- concentration.
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pH and Hydrogen Ion Concentration Calculator
Convert between pH and hydrogen ion concentration [H+]. Calculate pOH, [OH-], and determine if a solution is acidic, neutral or alkaline.
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About our chemistry calculators
These chemistry calculators handle the calculations that come up constantly in the lab and the classroom: molarity and concentration, molar mass, stoichiometry, pH and buffers, gas laws, reaction yields, enthalpy and Gibbs free energy, electrochemistry, and more. Each gives an instant answer alongside a clear explanation of the chemistry behind it.
Accurate chemistry depends on getting units, significant figures, and the underlying relationships right — so every calculator here shows its method and the formula used. The guides cover the essentials of moles and Avogadro’s number, concentration in mol/L and other units, the ideal gas law, Le Chatelier’s principle, acid-base equilibria, and thermodynamics, with worked examples throughout.
Whether you’re revising for chemistry exams, preparing a practical, or just need a quick reliable answer, these tools are free, require no account, and are written to teach the chemistry, not just produce a result.