Feeds & Speeds Calculator (Milling)

Estimate the spindle RPM, feed rate and material removal rate for an end mill from the cutter diameter, number of flutes, the workpiece material's cutting speed and a per-tooth chip load. Pick a material preset to load a recommended surface speed and chip load (HSS end-mill starting points), then adjust to suit your setup, tool coating and rigidity. Useful for desktop CNC, manual milling and hobby machining. RPM comes from surface speed ÷ circumference; feed rate from RPM × chip load × flutes; MRR from width × depth × feed. Pure arithmetic — these are starting points, not a substitute for toolmaker data, and real feeds depend on rigidity, coolant, tool wear and engagement. Everything runs locally in your browser.