Fastime Performance HP ↔ CFM Calculator

Simple rule-of-thumb relationship between airflow (CFM) and horsepower.

Approximate Result

Horsepower —

Uses CFM ≈ HP × (CFM/HP). Default 1.30 CFM/HP is a common rule of thumb for NA gasoline engines.
 Real results depend on VE, fuel, boost, etc. – treat this as a rough guideline only.