All calculators
Every calculator on Chemkit, grouped by subdiscipline. Each one ships with a worked example, the equation used, and citations for every constant.
General
Everyday lab math — molarity, dilutions, molar mass, buffers, and serial dilutions. The bench toolkit every chemist reaches for daily.
- Molarity Calculator
Solve for mass, molecular weight, volume, or molar concentration in mol/L.
- Dilution Calculator
C₁V₁ = C₂V₂ — solve for any of the four dilution variables.
- Molar Mass Calculator
Type a chemical formula, get the molecular weight in g/mol.
- Buffer Calculator
Henderson-Hasselbalch pH from acid/base ratio, plus common recipes.
- Serial Dilution Calculator
Plan multi-step dilutions with per-step volumes and a stock check.
- Percent Solution Calculator
% w/v, % w/w, % v/v — plus cross-conversion via density.
- Percent Yield Calculator
% yield direct or from limiting reagent, with theoretical mass and grams lost.
- Dilution Factor Calculator
DF, 1:N ratio, stock and final volumes — solve any of the three.
- Limiting Reagent Calculator
Find the limiting reagent and theoretical yield for aA + bB → cC.
Organic
Reaction mechanisms, functional-group transformations, NMR and IR interpretation, stereochemistry, and yield accounting for synthesis routes.
- Degrees of Unsaturation Calculator
Index of hydrogen deficiency from a molecular formula or atom counts. Halogen and N rules built in.
Inorganic
Coordination chemistry, oxidation-state bookkeeping, crystal-field splitting, and solid-state stoichiometry.
- Ksp / Molar Solubility Calculator
Molar solubility from Ksp (or vice versa) for any M_aX_b salt, with common-ion depression.
Physical
Thermodynamics, kinetics, and equilibrium — gas laws, Gibbs free energy, Arrhenius kinetics, and rate-law analysis.
- Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles, or temperature — every common unit.
- Nernst Equation Calculator
Solve E = E° − (RT/nF)·ln Q for cell potential, E°, n, or Q at any T. 25 °C shortcut included.
- Half-Life Calculator
Half-life, k, [A]t, or time-to-fraction — first-order kinetics and radioactive decay.
Analytical
Titration curves, pH and normality of acid–base systems, Beer–Lambert absorbance, chromatography retention, and calibration regression.
- pH Calculator
Strong/weak acid & base pH from concentration and pKa/pKb, full-quadratic solve.
- Normality Calculator
N from molarity, mass, or titration — with common equivalent-factor presets.
- Beer-Lambert Calculator
Solve A = ε·b·c for absorbance, molar absorptivity, path length, or concentration.
Biochem
Enzyme kinetics (Michaelis–Menten, Lineweaver–Burk), protein–ligand binding, nucleic-acid Tm, and biological buffer preparation.
- Michaelis-Menten Calculator
Solve v, Vmax, Km, or [S]. Optional [E]_total unlocks kcat and the specificity constant.