Arrhenius Equation Calculator
By Santaji GadepatilinUpdated October 27, 2026
10,000,000,000
kJ/mol
calculated
Type in any field to change it. Press × on a value to calculate that field instead.
Rate constant (same units as A) vs Temperature (°C) — other inputs held at your current values.
How to use this calculator
Enter the pre-exponential factor, activation energy and temperature. The rate constant is calculated. The chart shows how sharply k rises with temperature.
Formula
k = A × e−Ea / (RT) (R = 8.314 J/mol·K)
Worked example
A = 1 × 10¹⁰ s⁻¹, Ea = 50 kJ/mol:
- At 25 °C: k = 17.4 s⁻¹
- At 35 °C: k = 33.5 s⁻¹ — about 1.92× faster
Why it matters
- Food spoils more slowly in a fridge.
- Industrial reactors are heated to speed up production.
- Catalysts work by lowering Ea, raising k without extra heat.
Frequently asked questions
What does the Arrhenius equation show?
How the rate of a reaction increases with temperature, depending on the activation energy.
Is it true that reactions double every 10 °C?
Roughly, for activation energies around 50 kJ/mol near room temperature. It is a rule of thumb, not a law.
What units does k have?
The same as A, which depends on the reaction order (for example s⁻¹ for first-order reactions).