Desktop CNC 101
Calculators

CNC calculator

CNC Feeds and Speeds Calculator

Calculate CNC feed rate, chip load, spindle speed, surface speed, and material removal rate for routing, engraving, and light milling.

Feed rate

72.0 in/min

Chip load

0.0020 in/tooth

Surface speed

1,178 SFM

Removal rate

0.56 in3/min

Formula

Feed rate
Feed = RPM x flutes x chip load
Surface speed
SFM = diameter in inches x RPM x pi / 12
Material removal rate
MRR = feed rate x radial stepover x axial depth of cut

Setup notes

  • Reduce chip load when cutting with long stickout, small tools, or weak workholding.
  • For V-bits and engraving bits, use the effective cutting diameter at the programmed depth.