CNC feeds and speeds calculator CNC feeds and speeds calculator

CNC feeds and speeds calculator

Calculate milling speed and feed, starting from cutting speed or known spindle RPM.

Calculator settings

Tool and cutting parameters

mm/tooth
Optional machine limits
mm/min
Calculation, not a cutting recommendationEnter cutting speed and feed per tooth from the tool supplier for your material and operation. Limits clamp RPM first, then feed. Zero means the limit is unknown. Rigidity, radial engagement, coolant, runout and tool condition are not modeled.

Result

Spindle speed
6,366 RPM
Feed rate
509.3 mm/min
Actual feed per tooth
0.04 mm/tooth
Surface speed
120 m/min
Formula
RPM = 1000 x cutting speed / (pi x diameter), feed = RPM x flutes x chip load

CNC RPM and feed rate calculator

Use the calculator for first-pass CNC settings before checking material and tool recommendations.

Final settings depend on machine rigidity, tool geometry, material, cooling and workholding.

Quick start

Calculate milling speed and feed with optional machine limits.

  1. Start from cutting speed or spindle RPM
  2. Enter tool geometry and feed per tooth
  3. Review limited RPM, feed and actual chip load
✓ Use the calculator to turn input values into a clear, repeatable result.
✓ Keep units and assumptions visible so the calculation can be checked later.
✓ Copy the result or key numbers for reports, messages or spreadsheets.
✓ Reset to defaults when you want to compare another scenario from a clean state.
✓ Calculators run in the browser and are useful for quick estimates before formal checks.
✓ For finance, health, engineering or legal decisions, verify important results with a specialist or official source.

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