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Chemistry

Arrhenius Equation Calculator

Estimate a reaction rate constant at a second temperature using activation energy and a known rate constant.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

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Your chemistry result

Your result

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Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter known rate constant k1, initial temperature, final temperature, activation energy.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

k2 = k1 × exp[(Ea/R) × (1/T1 − 1/T2)], with Ea converted to J/mol and R = 8.31446261815324 J/(mol·K).

A WORKED EXAMPLE

Using known rate constant k1 = 0.01, initial temperature = 298.15 K, final temperature = 308.15 K, activation energy = 50 kJ/mol, the result is 0.0192426482 same units as k1. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

It retains the units of your entered k1. Those units depend on reaction order; this tool scales the constant without assigning an order.

What to keep in mind

Assumes one Arrhenius regime with constant activation energy and unchanged reaction mechanism. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

What units does the new rate constant have?

It retains the units of your entered k1. Those units depend on reaction order; this tool scales the constant without assigning an order.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.