45 FREE TOOLS · ⚗
Chemistry calculators
Moles, concentrations and ideal-gas calculations with clear units.
Concentration & mixtures
Work with moles, concentration, dilution and mixture fractions.
Explore topic ↗10 calculatorsGas laws
Explore ideal pressure, volume and absolute-temperature relationships.
Explore topic ↗7 calculatorsReaction quantities & yield
Compare theoretical reaction quantities, actual yield and purity.
Explore topic ↗4 calculatorsAbsorbance & spectroscopy
Relate concentration, path length, absorbance and transmittance.
Explore topic ↗All chemistry calculators
Moles Calculator
Convert a substance’s mass into amount of substance using its molar mass.
Molarity Calculator
Calculate solution molarity from solute amount and final solution volume.
Dilution Calculator
Find stock volume required for a target diluted concentration.
Mass Percent Calculator
Calculate a component’s mass percentage within a mixture.
Molality Calculator
Calculate molality using solute amount and solvent mass.
Ideal Gas Pressure Calculator
Estimate absolute pressure for an ideal gas in a specified volume.
Gas Density Calculator
Estimate ideal-gas density from absolute pressure, molar mass and temperature.
Molecule Count Calculator
Convert moles to a count of specified elementary entities.
Percent Yield Calculator
Compare actual product yield with theoretical yield.
Mass Concentration Calculator
Find solute mass per litre of final solution.
Solution Mass Calculator
Find solute mass needed for a chosen molarity and final solution volume.
Mole Fraction Calculator
Find a component’s mole fraction in a two-component mixture.
Solution Mixing Calculator
Estimate concentration after mixing two solutions with additive volumes.
Parts Per Million Calculator
Calculate mass-based ppm from solute and total mixture masses.
Boyles Law Calculator
Find final volume for an ideal gas at constant temperature and fixed amount.
Charles Law Calculator
Find final gas volume after a temperature change at fixed absolute pressure.
Combined Gas Law Calculator
Find final volume when ideal-gas pressure and temperature both change.
Theoretical Yield Calculator
Calculate theoretical product mass from reactant mass and a molar stoichiometric ratio.
Atom Economy Calculator
Find theoretical desired-product mass relative to reactant mass in a balanced equation.
Percent Purity Calculator
Calculate a sample’s pure-component mass as a percentage of total sample mass.
Molar Mass From Sample Calculator
Recover molar mass from a known sample mass and amount of substance.
Solvent Mass From Molality Calculator
Find solvent mass for an entered molality and solute amount.
Molarity From Mass Concentration Calculator
Convert a mass concentration into molar concentration.
Mass From Weight Percent Solution Calculator
Find solute mass in a mixture specified by mass percentage.
Solvent Mass in Solution Calculator
Separate solvent mass from a two-component solution mass and solute percentage.
Dilution Factor Calculator
Express a concentration reduction as a dilution multiple.
Serial Dilution Concentration Calculator
Estimate concentration after equal serial dilution stages.
Solvent Addition for Dilution Calculator
Estimate solvent addition needed to dilute a fixed stock-solution volume.
Volume Percent Calculator
Express a component’s entered volume as a percentage of final mixture volume.
Mass Volume Percent Calculator
Find the grams-per-100-millilitres concentration of a solution.
Ideal Strong Acid pH Calculator
Estimate concentration-based pH under an explicitly ideal strong-acid model.
Ideal Strong Base pH Calculator
Estimate an ideal strong-base pH under a stated room-temperature approximation.
Henderson Hasselbalch Calculator
Estimate buffer pH from an entered pKa and conjugate-base-to-acid ratio.
Beer Lambert Absorbance Calculator
Find ideal optical absorbance from concentration and optical path length.
Concentration From Absorbance Calculator
Recover concentration under a linear absorbance model.
Transmittance to Absorbance Calculator
Convert a transmitted-light percentage into base-ten absorbance.
Absorbance to Transmittance Calculator
Express absorbance as a transmitted fraction of incident light.
Ideal Gas Volume Calculator
Find ideal gas volume from amount, pressure and temperature.
Ideal Gas Temperature Calculator
Recover ideal gas absolute temperature from pressure, volume and amount.
Daltons Partial Pressure Calculator
Find a gas component’s partial pressure from its mole fraction.
Gas Mole Fraction From Pressure Calculator
Recover ideal gas mole fraction from a component pressure and total pressure.
Ideal Gas Molar Volume Calculator
Find molar volume for an ideal gas at selected conditions.
First Order Reaction Remaining Calculator
Estimate reactant concentration after a first-order reaction interval.
First Order Reaction Half Life Calculator
Find half-life from a first-order reaction rate constant.
Reaction Conversion Calculator
Find the consumed fraction of an initially supplied reactant.
Make your inputs count
Identify the exact substance and keep mass, volume and concentration units consistent. Molarity uses final solution volume, whereas molality uses solvent mass. Gas relationships use absolute pressure and temperature, not gauge pressure or degrees Celsius.