Feeds and Speeds Calculator
Spindle rpm and table feed rate for milling from cutting speed, tool diameter, flutes and chip load.
Inputs
mm
m/min
Aluminium 200–400 · mild steel 80–150 · stainless 50–90 (carbide)
flutes
mm/tooth
Results
- Spindle speed
- 3,820 rpm
- Feed rate
- 573 mm/min
- Feed rate
- 22.56 in/min
Formula
rpm = 1000 × Vc ÷ (π × D)
Feed = rpm × flutes × chip load
Assumptions & limits
- Starting values only — follow the tool maker's data and reduce for long reach or weak setups.
Worked example
1000 × 120 ÷ (π × 10) = 3,820 rpm × 3 × 0.05 = 573 mm/min.