Interactive calculator
RPM Calculator
Calculate spindle RPM from cutting speed and diameter.
What this calculator gives you
The calculator performs the defined mathematical relationship from the values entered. It does not choose production cutting data or inspect the physical machine setup.
Inputs to verify
Use the actual tool diameter, cutting data, RPM, feed, flute count or thread data required by the operation. Keep the unit system consistent and check the result against manufacturer documentation and machine limits.
How to use it
- Choose metric or imperial units.
- Enter the values from the actual job or tooling documentation.
- Review the displayed formula and calculated result.
- Check the result against the machine, tool, material and engagement.
- Record a validated starting condition if the setup is proven.
Related CNC references
Milling · Turning · Drilling · Tapping · Materials · Charts & Formulas