Method
How this tool works
RPM = cutting speed × 1,000 ÷ (π × diameter). Table feed = chip load × RPM × effective teeth.
Worked example
A 10 mm, 4-flute cutter at 100 m/min and 0.05 mm/tooth runs at about 3,183 RPM and 637 mm/min.
Convert cutting data into machine settings
CNC Speeds and Feeds Calculator
Calculate spindle speed, table feed, feed per revolution and cutting time from metric tool data.
Use responsibly
Assumptions & limitations
Start with tooling and material data from the manufacturer. Machine rigidity, engagement, coolant and workholding can require a lower setting.
Last reviewed: 28 July 2026
Calculation and copy checked for this release.
Practical guide
CNC speeds and feeds formulas, with a worked example
Understand the relationship between cutting speed, tool diameter, spindle speed, chip load and table feed before entering machine settings.