Chemical Kinetics & Catalysis Calculators
All chemical kinetics & catalysis calculators in one place.
Zero-Order Reaction Rate Calculator
Solve the zero-order integrated rate law [A]t = [A]0 − kt for the concentration remaining, the initial concentration, the rate constant k, or the time elapsed, with automatic half-life and time-to-completion — plus an Advanced Tools fit that finds k and [A]0 directly from a table of lab data, with full step-by-step working.
First-Order Reaction Rate Calculator
Solve the first-order integrated rate law [A]t = [A]0 · e^(−kt) for the concentration remaining, the initial concentration, the rate constant k, or the time elapsed, with a constant half-life that doesn't depend on starting concentration — plus an Advanced Tools ln[A]-vs-time fit that finds k and [A]0 directly from a table of lab data, with full step-by-step working.
Second-Order Reaction Rate Calculator
Solve the second-order integrated rate law 1/[A]t = 1/[A]0 + kt for the concentration remaining, the initial concentration, the rate constant k, or the time elapsed, with a half-life that depends on starting concentration and doubles with each successive half-life — plus an Advanced Tools 1/[A]-vs-time fit that finds k and [A]0 directly from a table of lab data, with full step-by-step working.
Arrhenius Activation Energy Solver
Solve the two-point Arrhenius equation ln(k2/k1) = −(Ea/R)(1/T2 − 1/T1) for a new rate constant, the original rate constant, the activation energy Ea, or either temperature, with an instant read on how much faster the reaction runs — plus an Advanced Tools Arrhenius plot that fits Ea and the pre-exponential factor A directly from a table of lab data, with full step-by-step working.
Reaction Rate Constant Calculator
Solve the general rate law rate = k[A]^m[B]^n for the rate constant k, the reaction rate, or a reactant concentration at any reaction order, with automatic unit handling for k — plus an Advanced Tools method of initial rates solver that fits the reaction orders and k directly from a table of lab experiments, with full step-by-step working.
Half-Life Kinetics Calculator
Solve for half-life (t½), the rate constant k, or the initial concentration [A]0 for zero-order, first-order, or second-order reactions, with a chart of how each successive half-life changes (or stays constant) by order — plus an Advanced Tools fractional-life solver that finds the time to reach any percent remaining, with full step-by-step working.
Enzyme Kinetics (Michaelis-Menten)
Solve the Michaelis-Menten equation v = Vmax[S]/(Km + [S]) for reaction velocity, substrate concentration, Km, or Vmax, with a saturation-curve diagram — plus an Advanced Tools Lineweaver-Burk fit from lab data and competitive, uncompetitive, and noncompetitive inhibition modeling, with full step-by-step working.
Turnover Number (kcat) & Catalytic Efficiency
Solve kcat = Vmax / [E]T for turnover number, maximum velocity, or total enzyme concentration, then calculate catalytic efficiency (kcat/Km) in M⁻¹s⁻¹ and see how it compares to the diffusion limit — or switch to Advanced Tools to rank several enzymes side by side on a catalytic-efficiency chart, with full step-by-step working.
Temperature Coefficient (Q10) Calculator
Calculate the Q10 temperature coefficient Q10 = (R2/R1)^[10/(T2−T1)] from two rates measured at two temperatures, predict a new reaction rate, growth rate, or metabolic rate at a target temperature from a known Q10, or solve for the missing temperature — plus an Advanced Tools mode that scales a process duration (incubation, fermentation, cooking time) up or down for a new temperature, with a full temperature-vs-duration table and step-by-step working.