Arrhenius Equation Calculator

Rate constant at a new temperature or activation energy from two rate constants (Arrhenius equation).

How to use the Arrhenius Equation Calculator

Enter or select: Activation energy Eₐ, Rate constant k₁, Temperature T₁, Temperature T₂.
The results (Rate constant k₂, Rate ratio k₂/k₁, Pre-exponential factor A) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

k = A·e^(−Eₐ/RT)
ln(k₂/k₁) = −(Eₐ/R)(1/T₂ − 1/T₁)