Core equation
Feed rate = RPM × flutes × chip loadInputs are normalized before calculation and converted back to the selected output units.
Machining / interactive calculator
CNC Feed Rate Calculator
Convert chip load, flute count, and spindle speed into programmed table feed and feed per revolution.
rpm
Programmed spindle speed.
z
Number of effective cutting edges.
chip
Start with current tooling data.
Formula & assumptions
How the calculation works
Production check
Reduce or adapt the starting value for rigidity, runout, entry conditions, toolpath engagement, and machine acceleration.
Production application disclaimerEducational planning estimate. Verify the result against current tooling data, material condition, machine limits, workholding, inspection requirements, and qualified personnel before production.
Last reviewed: September 4, 2026 · Formula and metric/imperial conversion checks completed.