Chemistry Calculators

Equilibrium Constant Calculator

Calculate equilibrium constant from concentrations.

Freezing Point Depression Calculator

Calculates freezing point depression using ΔTf = i · Kf · m.

Gibbs Energy Calculator

Computes Gibbs free energy change using ΔG = ΔH − TΔS.

Grahams Law of Diffusion Calculator

Calculates diffusion/effusion rate ratio using Graham’s law: r₁/r₂ = √(M₂/M₁).

Grams to Moles Calculator

Free online Grams to Moles Calculator. Quickly calculate and get instant results.

Half Life Calculator

Free online Half Life Calculator. Quickly calculate and get instant results.

Heat of Combustion Calculator

Finds molar heat of combustion from measured heat: ΔH_comb = −q/n (negative for exothermic).

Henderson-Hasselbalch Calculator

Calculate buffer pH using the Henderson-Hasselbalch equation.

Hydraulic Retention Time Calculator

Computes hydraulic retention time using HRT = V/Q (shown in hours and days).

Hydrogen Ion Concentration Calculator

Free online Hydrogen Ion Concentration Calculator. Quickly calculate and get instant results.

Ideal Gas Law (Chemistry)

Calculate using the Ideal Gas Law with R = 0.08206 L atm/(mol K).

Ionic Strength Calculator

Calculates ionic strength: I = 1/2 Σ cᵢ zᵢ² (up to 5 ion species).

Isoelectric Point Calculator

Estimates isoelectric point pI as the average of two relevant pKa values.

Kp Calculator

Computes Kp from Kc using Kp = Kc(RT)^Δn (R = 0.082057 L·atm·mol⁻¹·K⁻¹).

Langmuir Isotherm Calculator

Calculates Langmuir adsorption capacity qe = (qmax·KL·Ce)/(1 + KL·Ce).

Lattice Energy Calculator

Estimates lattice energy via Born–Landé: U = −(NA·A·z+z−·e²/4πε0r0)(1−1/n).

Liquid Ethylene Density Calculator

Provides a simple linear estimate of liquid ethylene density as a function of temperature.

Mass Percent Calculator

Compute mass percent (% w/w) from solute mass and total solution mass.

Michaelis Menten Equation

Calculate enzyme reaction rate v using the Michaelis–Menten equation.

Miller Indices Calculator

Compute reciprocals of plane intercepts (basis for Miller indices h, k, l).

Mixing Ratio Calculator

Calculate mixing ratio as solute-to-solvent mass ratio (g/g and g/kg).

Molality Calculator

Calculate molality of a solution.

Molar Mass Calculator

Calculate molar mass from mass and moles.

Molar Mass of Gas Calculator

Free online Molar Mass of Gas Calculator. Quickly calculate and get instant results.