Spindle Speed Calculator
Calculate RPM from cutting speed (SFM) and tool diameter for milling, turning, and drilling operations.
Inputs
SFM
in
Results
Spindle Speed
2,292 RPM
Cutting Speed (metric)91.4 m/min
Tool Diameter (metric)12.7 mm
How to Use This Calculator
- Enter the recommended cutting speed (SFM or m/min) from your tooling manufacturer's chart.
- Set the tool or cutter diameter (inches or mm).
- Review the calculated spindle speed (RPM) and equivalent metric cutting speed.
- Program this RPM into your CNC controller's speed override for the current operation.
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