kDa Calculator — Convert Daltons to Kilodaltons & Estimate Protein Size
Convert between Da, kDa and MDa instantly, estimate protein molecular weight from amino acid count or gene length, and predict SDS-PAGE band position with a visual gel diagram
Calculators
Reaction Rate Calculator — Rate Law, Integrated Rate Laws & Reaction Order
Free reaction rate calculator — compute rate=k[A]^m[B]^n, determine reaction order and rate constant by method of initial rates, solve integrated rate laws for zero/first/second order, and identify reaction order from concentration-time graphs. Full step-by-step working
Osmotic Pressure Calculator — π=iMRT, Van’t Hoff Equation & Colligative Properties
Free osmotic pressure calculator — compute π=iMRT for any solution, find molar mass of proteins by osmometry, determine van’t Hoff factor, and compare all four colligative properties. Includes tonicity predictor and reverse osmosis pressure tool
Boiling Point Elevation Calculator — ΔTb=Kbmi & Freezing Point Depression
Free boiling point elevation calculator — compute ΔTb=Kb×m×i and ΔTf=Kf×m×i for any solvent, find molar mass by cryoscopy, calculate van’t Hoff factor. Includes Kb/Kf tables for 10 solvents and van’t Hoff factor presets for common solutes
Activation Energy Calculator — Arrhenius Equation, Ea & Rate Constant
Free activation energy calculator — solve k=Ae^(−Ea/RT) for any variable, find Ea using the two-point Arrhenius method, perform linear regression on Arrhenius plot (ln k vs 1/T), and visualize the potential energy diagram. Full step-by-step working
Half Life Calculator — Radioactive Decay, Carbon Dating & Decay Constant
Free half life calculator — solve N=N₀(½)^(t/t½) for any variable, calculate carbon-14 dating age, find decay constant λ, and reference half-lives for 25+ isotopes. Includes types of radioactive decay with nuclear equations. Full step-by-step working
Equilibrium Constant Calculator — Kc, Kp, ICE Tables & Q vs K
Free equilibrium constant calculator — write Kc/Kp expressions, solve ICE table problems, convert Kp to Kc using Kp=Kc(RT)^Δn, and compare Q to K to predict reaction direction. Full step-by-step solutions with color-coded ICE tables.
Gibbs Free Energy Calculator — ΔG=ΔH−TΔS, Spontaneity & Equilibrium
Free Gibbs free energy calculator — compute ΔG=ΔH−TΔS, find spontaneity, convert ΔG° to equilibrium constant K (ΔG°=−RT×lnK), calculate ΔG from cell voltage (ΔG=−nFE), and use standard Gibbs free energy of formation tables. Full step-by-step working.
Enthalpy Calculator — ΔH Reaction, Hess’s Law, Calorimetry & Clausius-Clapeyron
Free enthalpy calculator — compute ΔH of reaction using Hess’s law, solve calorimetry problems (q=mcΔT), find enthalpy of fusion and vaporization, and use Clausius-Clapeyron to relate vapor pressure to temperature. Full step-by-step working with energy diagrams
Ideal Gas Law Calculator — PV=nRT, Combined Gas Law & Van der Waals
Free ideal gas law calculator — solve PV=nRT for any variable, use the combined gas law (Boyle’s, Charles’s, Gay-Lussac’s), find molar mass of unknown gases, and compare ideal vs real gas with Van der Waals equation. Full step-by-step working.