CNC Feeds & Speeds Calculator

CNC Feeds & Speeds Calculator is a machinist's feeds and speeds calculator that turns material, tool, and dimension inputs into a starting-point RPM and feed rate for milling, turning, drilling, and tapping - at the machine, on the shop floor, or wherever you plan a job.

No internet. No account. No nonsense.

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MILLING
- 13 materials: aluminum, mild and alloy steel, stainless, cast iron, brass, copper, titanium, plastics, and hardwood
- HSS, uncoated carbide, or coated carbide tooling
- Tool diameter in inches or millimeters, 1-8 flutes
- SFM, RPM, chip load per tooth, and feed rate in IPM and mm/min
- Optional radial width-of-cut input for chip-thinning-adjusted feed on light stepovers
- Warning flag above 24,000 RPM

TURNING
- Same material and tool selection, workpiece diameter input
- SFM, RPM, roughing and finishing feed per revolution
- General depth-of-cut guidance for roughing and finishing passes

DRILLING
- HSS or carbide drills, diameter-bracketed SFM, RPM, and feed per revolution
- Standard (3x diameter) and deep-hole (1x diameter) peck depth suggestions

TAPPING
- Metric coarse (M2-M20), UNC, and UNF thread systems
- 75%-thread tap drill size in millimeters and the nearest standard fractional, number, or letter drill
- Tapping RPM from material SFM at the tap's major diameter

Every calculator screen has a share action to send your setup as text to another app.

Cutting values are commonly-published machinability reference figures, set on the conservative side for hobbyist and job-shop use - always treat them as a starting point and adjust for machine rigidity, coolant, workholding, and tool condition.

This app is ad-supported. Sharing a setup may show a short video ad; if none is available the share still goes through.