Pre-exponential Factor Calculator
Calculate the Arrhenius pre-exponential factor (A)
About Pre-exponential Factor
The pre-exponential factor (A), also called the frequency factor, represents the frequency of molecular collisions with correct orientation for reaction.
Typical values:
- Unimolecular reactions: 10¹² - 10¹⁴ s⁻¹
- Bimolecular reactions: 10¹⁰ - 10¹¹ M⁻¹s⁻¹
A includes both the collision frequency (Z) and steric factor (p): A = p × Z
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Chemistry: The Central Science
by Brown, LeMay, Bursten
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.