MachiningCalc / End Mill Speeds & Feeds Calculator

End milling · feeds & speeds

End Mill Speeds & Feeds Calculator

Calculate end mill spindle speed and feed rate from known cutting data, then estimate material removal from axial and radial engagement.

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Calculator

Enter your known cutting data. Results update automatically.

Spindle speed—
Feed rate—
Material removal—
Feed per rev—

Use manufacturer cutting data and stay within machine, tool and workholding limits.

Calculation check: The tool uses RPM = SFM × 12 ÷ (π × D), IPM = RPM × flutes × IPT, and MRR = DOC × WOC × IPM.
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US unitsInches, SFM, RPM, IPM
TransparentFormula and assumptions shown
Connected workflowLinks to the next calculation

Calculation method

How this calculator works

RPM = SFM × 12 ÷ (π × Cutter Diameter)IPM = RPM × Flutes × IPTMRR = Axial DOC × Radial WOC × IPM

Values are deterministic outputs from the inputs shown above; cutting recommendations are not inferred.

End mill speed and feed calculation

Use the cutter's actual cutting diameter, the toolmaker's SFM recommendation and chip load per tooth. Effective flute count matters because feed rate is the product of chip load, RPM and cutting teeth.

Depth and width of cut

The MRR output is a geometric estimate for rectangular engagement. It helps compare parameter sets but does not model spindle power, chip thinning, tool deflection or dynamic limits.

Technical references