Reaction kinetics & half-life calculator

Q: How should I format data for the fitting and Arrhenius modes?

For data fitting, paste time and concentration pairs as t, A on separate lines (all A values must be positive). For Arrhenius plots, paste T, k pairs with T in kelvins and k > 0. The calculator performs straight-line fits to the transformed data and reports slopes, intercepts, R² and kinetic parameters.

How to use (3 steps)

Choose a mode: integrated rate law, data fitting, or Arrhenius.
Enter A₀, k and t for theory, paste measured (t, [A]) or (T, k) data for fitting.
Read off [A](t), fraction remaining, t₁/₂, best-fit order and Arrhenius parameters, then copy the URL to share the setup.

A default 1st-order example and small datasets are preloaded so you can see results and plots immediately.

Inputs

Pick a mode, adjust the example numbers or paste your own data. Be sure that the units of k and t (or T and k) are consistent within a given calculation.

Integrated rate law Data fitting (0th/1st/2nd) Arrhenius (ln k vs 1/T)

Reaction order n

Initial concentration [A]₀ (mol/L)

Rate constant k (units depend on order)

For 0th order k has units of mol·L⁻¹·time⁻¹, for 1st order time⁻¹, and for 2nd order L·mol⁻¹·time⁻¹.

Time t (consistent with k)

Results

Mode: Integrated rate law

This section summarizes the main quantities computed from your inputs (concentration, fraction remaining, half-life, fitted constants and Arrhenius parameters).

How it is calculated

Steps will appear here after calculation.

FAQ

Which reaction orders does this tool support?

It focuses on simple 0th, 1st and 2nd order kinetics for a single reactant A, using the integrated forms [A](t) = [A]₀ − k t, ln[A] = ln[A]₀ − k t and 1/[A] = 1/[A]₀ + k t. For more complex mechanisms or mixed orders, treat this calculator as a first diagnostic rather than a full kinetic model.

How should I format data for the fitting and Arrhenius modes?

For data fitting, paste time and concentration pairs as t, A on separate lines (all A values must be positive). For Arrhenius plots, paste T, k pairs with T in kelvins and k > 0. The calculator performs straight-line fits to the transformed data and reports slopes, intercepts, R² and kinetic parameters.

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