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Cutting Speed Calculator
Calculate optimal RPM and cutting speeds for CNC machining operations. Get precise parameters based on material type, tool diameter, and tooling selection.
Speed & Feed Calculator
Soft, excellent machinability
High performance tooling
Calculated Results
Enter tool diameter and select parameters to calculate cutting speeds
Material Speed Reference
| Material | Base SFM | HSS | Carbide | Ceramic |
|---|---|---|---|---|
| Aluminum | 800 | 800 | 2400 | 4000 |
| Brass | 300 | 300 | 900 | 1500 |
| Mild Steel | 100 | 100 | 300 | 500 |
| Carbon Steel | 80 | 80 | 240 | 400 |
| Alloy Steel | 60 | 60 | 180 | 300 |
| Stainless Steel | 50 | 50 | 150 | 250 |
| Tool Steel | 40 | 40 | 120 | 200 |
| Cast Iron | 120 | 120 | 360 | 600 |
| Titanium | 200 | 200 | 600 | 1000 |
| Inconel | 30 | 30 | 90 | 150 |
Cutting Speed Formulas
RPM Calculation
RPM = (SFM × 12) ÷ (π × Diameter)
Where SFM is surface feet per minute and diameter is in inches
Feed Rate Calculation
Feed Rate = RPM × Chip Load × Flutes
Chip load varies by material and tool geometry
Soft Materials
- • High cutting speeds
- • Sharp cutting edges
- • Good chip evacuation
- • Flood coolant recommended
Medium Materials
- • Moderate cutting speeds
- • Coated tools preferred
- • Consistent feed rates
- • Monitor tool wear
Hard Materials
- • Lower cutting speeds
- • Rigid machine setup
- • Carbide or ceramic tools
- • Constant engagement