Machinist Feed & Speed Calculator

What this tool does

Calculate spindle RPM from surface speed (SFM or SMM) and tool diameter, then compute tool feed (IPM or mm/min) using chipload (IPT/IPR). Supports Endmill, Drilling, Reaming and Turning with recommended defaults.

  • Choose material from the searchable list.
  • Pick operation (Endmill / Drill / Reamer / Turning).
  • Compute by SFM/SMM or set RPM directly; tool feed auto-calculates.

Quick tips

  • Units must match: use inches/SFM or mm/SMM consistently.
  • Chipload (IPT/IPR) defaults are suggested medians — adjust for tool coating, machine rigidity, and coolant.
  • Set machine limits (RPM and feed) to see safety indicators.
For turning, enter work diameter (OD).
If mode = RPM, leave blank.
IPT (endmills) / IPR (drills, turn)

Results

Computed RPM
—
Feed (IPM or mm/min)
—
Chipload used (IPT/IPR)
—

Safety

RPM status
Not calculated
Feed status
Not calculated
Notes
—

Reference

Selected material SFM ranges & recommended chiploads are from a standard machinist reference table.
No material selected

⚠️ Disclaimer: For Reference Use Only

The calculations and recommendations provided by this Machinist Feed & Speed Calculator are for informational and educational purposes only. They are not a substitute for professional machining knowledge, experience, and adherence to safety protocols.

  • No Guarantees: All calculated values and "recommended defaults" are based on generalized, industry-standard data. They are not guaranteed to be accurate, optimal, or safe for your specific application.
  • Assumed Risk: You, the user, assume full responsibility for any and all actions taken based on the information from this tool.
  • Variable Conditions: This calculator does not account for all real-world machining variables, including machine rigidity, tool coating, tool holder runout, coolant, depth of cut, or specific material hardness.
  • Liability: The creators of this calculator shall not be held liable for any damage to equipment, broken tools, scrapped parts, or personal injury.
  • Best Practice: Always consult your specific tooling manufacturer's recommendations and your machine's safety manual. Start with conservative values and adjust carefully.