Chemistry calculators
Stoichiometry, dilutions, pH, and decay — everyday lab arithmetic.
Chemistry calculators on pancalc help with stoichiometry, solutions, pH, gas laws, and spectroscopy homework or lab prep. Each page lists assumptions such as ideality, temperature, and activity effects.
Use them to verify dilution math, buffer estimates, or yield calculations before scaling a protocol. They do not replace safety data sheets or institutional procedures.
When lab results diverge, check temperature, ionic strength, and whether your sample matches the idealized model.
11 calculators
Beer-Lambert Law Calculator
Solve the Beer-Lambert law for absorbance, concentration, path length, or molar absorptivity using consistent spectroscopy measurement units.
Buffer Capacity Estimator
Estimate Van Slyke buffer capacity from total buffer concentration, pKa, and pH to compare how strongly a simple acid-base buffer resists pH change.
Gas Compressibility Z-Factor Calculator
Calculate the gas compressibility factor Z from pressure, volume, moles, and temperature to compare measured real-gas behavior with ideal-gas behavior.
Half-Life / Radioactive Decay Calculator
Calculate half-life, elapsed time, initial amount, or remaining amount with the exponential radioactive-decay equation for clear science and chemistry examples.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles, or temperature with SI and common lab units — ideal for stoichiometry and gas-collection homework.
Molar Mass Calculator
Calculate molar mass, sample mass, or amount in moles from any two values for reliable stoichiometry, solution preparation, and laboratory calculations.
Molarity & Dilution Calculator
Solve M1V1 equals M2V2 for stock volume, final volume, stock molarity, or target molarity when preparing straightforward chemical dilutions.
Nernst Equation Solver
Calculate electrochemical cell potential under non-standard temperature and reaction quotient conditions with the Nernst equation and clear voltage inputs.
Percent Yield Calculator
Calculate percent yield, actual yield, or theoretical yield to evaluate reaction efficiency with simple, consistent chemistry and laboratory result reporting.
pH & pOH Calculator
Convert pH, pOH, hydrogen-ion concentration, and hydroxide-ion concentration at 25°C using the standard aqueous acid-base relationships.
Vapor Pressure (Antoine) Calculator
Estimate pure-component vapor pressure from Antoine coefficients and temperature while preserving the pressure unit and valid range of the selected coefficie…