Arrhenius Equation Calculator

About this calculator

This calculator finds a chemical reaction's rate constant using the Arrhenius equation: k = A·e^(−Ea/RT), where A is the pre-exponential (frequency) factor, Ea is the activation energy, R is the gas constant, and T is absolute temperature. It captures why reaction rates rise sharply with even modest temperature increases.

Chemists, chemical engineers, and food scientists use it to predict how fast a reaction — or a spoilage or degradation process — will proceed at a given temperature, and to compare rate constants across temperatures when only Ea and A are known from an Arrhenius plot. Enter A, Ea, and T to get the rate constant k.