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Activation Energy from Two Rate Constants and Temperatures Calculator

Ea from Arrhenius equation using two k, T data points.

Uses the two-point Arrhenius equation ln(k₂/k₁) = (Ea/R)(1/T₁ − 1/T₂) to solve for activation energy Ea in kJ/mol.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

K
K

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Ea = R · ln(k₂/k₁) / (1/T₁ − 1/T₂)

In depth

Uses the two-point Arrhenius equation ln(k₂/k₁) = (Ea/R)(1/T₁ − 1/T₂) to solve for activation energy Ea in kJ/mol.