Arrhenius Equation Calculator
🔥 Thermochemistry & Bonding. Use the Arrhenius equation formula to find rate constant k, pre-exponential a, activation energy, temperature: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Rate constant k | 1/s |
| Pre-exponential A | 1/s |
| Activation energy | kJ/mol |
| Temperature | K |
Worked example
Find the rate constant k when Pre-exponential A = 1 × 10¹⁰ 1/s, Activation energy = 70 kJ/mol, Temperature = 298 K.
Using k = A e^(-Ea/RT): Rate constant k = 0.0053747 1/s.
Frequently asked questions
What is the formula for Arrhenius equation?
k = A e^(-Ea/RT).
What do the letters stand for, and what units are used?
Rate constant k in 1/s, Pre-exponential A in 1/s, Activation energy in kJ/mol, Temperature in K.
How do you calculate rate constant k?
Put the values into k = A e^(-Ea/RT). For example, with Pre-exponential A = 1 × 10¹⁰ 1/s, Activation energy = 70 kJ/mol, Temperature = 298 K, rate constant k = 0.0053747 1/s.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (rate constant k, pre-exponential a, activation energy, temperature) and fill in the others: it rearranges the formula for you.
