Chemistry Calculators
Gas laws, solutions, acid-base, and thermodynamics tools for students and lab prep.
Gas Laws
Avogadro's Law Calculator
Molar volume at STP from moles of gas.
Boyle's Law Calculator
Pressure-volume relationship at constant temperature.
Charles's Law Calculator
Volume-temperature relationship at constant pressure.
Combined Gas Law Calculator
Relate pressure, volume, and temperature for a gas sample.
Ideal Gas Law Calculator
Pressure from moles, temperature, and volume.
Solutions
Boiling Point Elevation Calculator
Boiling point elevation from molality and Ebullioscopic constant.
Cocktail Dilution Calculator
Dilute spirits to target ABV for cocktails.
Dilution Calculator
C1V1 = C2V2 dilution calculator.
Molality Calculator
Moles of solute per kg of solvent.
Normality Calculator
Equivalents per liter of solution.
Acid-Base
Buffer Capacity Calculator
Estimate buffer capacity from acid and conjugate base concentrations.
Hydrogen Ion Concentration Calculator
Hydrogen ion concentration from pH.
Hydroxide Ion Concentration Calculator
Hydroxide ion concentration from pOH.
pH Calculator
pH from hydrogen ion concentration.
pKa Calculator
pKa from acid dissociation constant Ka.
pOH Calculator
pOH from hydroxide ion concentration.
Thermodynamics
Activation Energy Calculator
Estimate activation energy from rate constants at two temperatures.
Arrhenius Equation Calculator
Calculate reaction rate constant from pre-factor and activation energy.
Boiling Point at Altitude Calculator
Estimate boiling point change with altitude.
Enthalpy Calculator
Heat transfer Q = mcΔT.
Galvanic Cell Potential Calculator
Cell voltage from reduction and oxidation potentials.
Gibbs Free Energy Calculator
Gibbs free energy from enthalpy and entropy.
Gibbs Free Energy of Reaction
Reaction Gibbs energy at a given temperature.
Half-Life Calculator
Remaining quantity after elapsed half-lives.
Half-Life of Reaction Calculator
First-order reaction half-life from rate constant.
Helmholtz Free Energy Calculator
Helmholtz free energy from internal energy and entropy.
Lattice Energy Calculator
Approximate lattice energy from ion charges and distance.
Stoichiometry
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