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
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.
Boiling Point Elevation Calculator — ΔTb=Kbmi & Freezing Point Depression
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
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.
Half Life Calculator — Radioactive Decay, Carbon Dating & Decay Constant
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.
Equilibrium Constant Calculator — Kc, Kp, ICE Tables & Q vs K
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. with color-coded ICE tables.
Ideal Gas Law Calculator — PV=nRT, Combined Gas Law
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.
Pressure Calculator — P=F/A, Hydrostatic, Absolute vs Gauge
compute P=F/A (force per area), hydrostatic pressure P=ρgh at any fluid depth, convert between absolute and gauge pressure, find pressure altitude with ISA formula, and convert all pressure units (Pa, psi, bar, atm, mmHg)
Free Fall Calculator — Distance, Time, Velocity & Terminal Velocity
compute fall time, distance, and velocity using v=gt, d=½gt², and v²=2gd. Includes terminal velocity calculator, reference table for falls from 10ft to 30,000ft, and comparison with/without air resistance
Doppler Effect Calculator — Frequency, Shift & Doppler Equation
compute observed frequency using f’=f(v+v_o)/(v+v_s) for sound or the relativistic formula for light. Includes sign convention guide, ambulance example, redshift calculator, and animated wavefront simulation