How dust collector sizing works
Tool CFM, duct losses, and free-air ratings.
Shop woodworking dust collection
Dust collector CFM calculator
Enter tool CFM and a duct factor. Get required airflow, then a 537 / 800 / 1,100 / 1,550 CFM class — or NO_MATCH. Free-air ratings only.
Shop woodworking dust collection
Result
Required = tool CFM × duct factor (1.0 / 1.25 / 1.5). Classes: 537 · 800 · 1,100 · 1,550 CFM.
From measurement to decision
Open the full calculator
Same tool with room for examples.
537 / 800 / 1.1k / 1.5k classes
When each class fits — and when none do.
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