How to use the arrhenius equation calculator
Find rate constant at a temperature from activation energy. Enter pre-exponential factor a, activation energy, temperature in the fields above; the rate constant k is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- A — Pre-exponential factor A
- Ea — Activation energy (kJ/mol)
- T — Temperature (K)
Worked example
With pre-exponential factor a = 1e13, activation energy = 75 kJ/mol, temperature = 298 K, the calculator gives rate constant k ≈ 0.7144217.
Frequently asked questions
What is the formula for the arrhenius equation calculation?
Rate constant k = A × exp(-Ea × 1000 / (RGAS × T)). Here A is pre-exponential factor a, Ea is activation energy (kJ/mol), T is temperature (K).
What inputs do I need for the arrhenius equation calculator?
You need pre-exponential factor a, activation energy in kJ/mol, temperature in K. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.