Speeds and Feeds Calculator
RPM = SFM × 12 / (π × diameter). Feed (IPM) = RPM × flutes × chip load.
RPM: Feed: IPM
Surface speed starting points
| Material | HSS (SFM) | Carbide (SFM) |
|---|---|---|
| Aluminum (6061) | 250 - 600 | 800 - 1500 |
| Brass / bronze | 150 - 300 | 400 - 800 |
| Plastics (Delrin, acetal) | 300 - 600 | 600 - 1000 |
| Mild steel (1018) | 80 - 110 | 350 - 500 |
| Alloy steel (4140 annealed) | 60 - 80 | 300 - 400 |
| Tool steel (annealed) | 30 - 50 | 150 - 250 |
| Stainless (304 / 316) | 40 - 60 | 200 - 300 |
| Gray cast iron | 60 - 90 | 250 - 400 |
| Titanium (6Al-4V) | 20 - 40 | 100 - 180 |
Starting points only - adjust for rigidity, stick-out, coolant and depth of cut, and follow your tool manufacturer's data.
Printable PDF version - Speeds & Feeds Chart
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.99.
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.99.