CNC Machining calculator

CNC Feed Rate Calculator

Use this calculator to turn a tooling recommendation into a programmed feed rate that a CNC machinist or programmer can enter in the CAM system or at the control. It keeps RPM, flute count, chip load, and feed override visible so the shop can adjust cutting conditions without losing the basis for the feed.

What this calculator does

  • Calculate CNC feed rate from spindle speed, flute count, chip load, and feed override for milling, routing, drilling, or similar rotating-tool operations.
  • selecting a starting feed rate for a cutter, comparing CAM defaults with tooling guidance, or documenting feeds and speeds for a setup sheet
  • The result is the feed rate to program, quote, or compare against CAM simulation and machine capability.

Formula used

  • Feed rate = spindle speed × flutes or cutting teeth × chip load per tooth × feed override
  • Use the feed override only for intentional derating or controlled optimization.

Inputs explained

  • Spindle speed: undefined
  • Flutes or teeth: undefined
  • Chip load: undefined
  • Feed override: undefined

How to use the result

  • Use it when setting feeds and speeds for a milling, drilling, routing, or cutter path before proving the job on the machine.
  • Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.

Common questions

  • What is the CNC feed rate calculator for? It calculates the programmed table feed or tool feed from RPM, teeth, and chip load so machining teams can set a realistic in/min feed.
  • What information should I enter? Use the actual RPM, effective flute count, chip load in inches per tooth, and any shop-approved override factor for the operation.
  • What does the result tell me? The result is the feed rate to program, quote, or compare against CAM simulation and machine capability.
  • When is the result only an estimate? Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.

Last reviewed 2026-05-12.