Chemistry Calculators
Calculator for Chemistry Calculations
Physical Chemistry
Buffer pH CalculatorPhysical ChemistryFind the pH of a buffer from its components or from the masses you weighed, and plan the recipe for a target pH with the Henderson-Hasselbalch equation, buffer capacity and effective range.
Buffer Capacity CalculatorPhysical ChemistryWork out a buffer's capacity beta three ways: from pKa, total concentration and pH with the Van Slyke equation, from a measured pH change, or straight from the weak acid and conjugate base concentrations.
Brine CalculatorPhysical ChemistryWork out the salt for any brine, on the water, the total weight or the food alone, or run it backwards from the salt you already used. Includes spoon measures by salt brand, brining times by thickness and the density, molarity, salinometer degree and freezing point of the solution.
Boiling Point Elevation CalculatorPhysical ChemistryWork out how far a dissolved solute raises a solvent's boiling point from the van't Hoff factor, the ebullioscopic constant and the molality, or run the equation backwards to recover the molality, the factor, the constant or the molar mass of an unknown solute.
Boiling Point CalculatorPhysical ChemistryFind the boiling point of water and other substances at any pressure with the Clausius-Clapeyron relation, solve for the pressure needed to hit a target temperature, derive the heat of vaporisation from two measured points, or work from an altitude.
Bleach Dilution CalculatorPhysical ChemistryWork out how much bleach and water to mix for a target concentration in percent or ppm, or for a bleach-to-water ratio, using C1V1 = C2V2.
Beer–Lambert Law CalculatorPhysical ChemistrySolve the Beer–Lambert law A = εlc for absorbance, molar absorptivity, path length or concentration; convert between absorbance, transmittance and %T; and find ε from a calibration.
Avogadro's Number CalculatorPhysical ChemistryConvert between moles, mass, molar mass, and the number of atoms, molecules, or ions using Avogadro's number.
Atomic Mass CalculatorPhysical ChemistryFind the average atomic mass of an element from its isotopes and their abundances, work out a missing percent abundance from a known average, or get the mass number of a single atom from its protons and neutrons.
Atom CalculatorPhysical ChemistryFind the number of protons, neutrons, and electrons in an atom or ion, or work backward from the particle counts to the atomic number, mass number, and charge.
Arrhenius Equation CalculatorPhysical ChemistrySolve the Arrhenius equation k = A*exp(-Ea/RT) for any variable, or find the activation energy from a rate constant measured at two temperatures. Per mole or per molecule, with an Arrhenius plot.
Annealing Temperature CalculatorPhysical ChemistryFind the PCR annealing temperature three ways: from primer and product melting temperatures, from two primer melting temperatures, or from a primer's length and GC content. Includes a gradient range and thermal-cycle chart.
Alligation CalculatorPhysical ChemistrySolve alligation problems: find the ratio and quantities to mix two stocks to a target strength (alternate), or the resulting strength of a blend (medial).
Alcohol Dilution CalculatorPhysical ChemistryWork out how much water to add to dilute a spirit to a target strength, or solve for any volume or strength from the alcohol dilution formula.
Acid-Base CalculatorPhysical ChemistryConvert between pH, pOH, [H+] and [OH-], and find the pH of weak or strong acids and bases and of buffers with the Henderson-Hasselbalch equation.Analytical Chemistry
Molar Absorptivity CalculatorAnalytical ChemistrySolve the Beer-Lambert law A = epsilon c l for molar absorptivity, absorbance, concentration, or path length. Enter any three values and get the fourth, plus transmittance, percent transmittance, and a calibration plot, in any units.
Dilution CalculatorAnalytical ChemistrySolve the dilution equation C1V1 = C2V2: enter any three of stock concentration, stock volume, final concentration, and final volume, and get the fourth plus the solvent to add and the dilution factor, in molar and volume units.
Actual Yield CalculatorAnalytical ChemistrySolve for actual yield, percent yield, or theoretical yield. Enter any two and get the third, plus stoichiometry and multi-step tools.