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Machining RPM & Feed Rate Calculator

Calculate peripheral milling spindle speed and linear table feed from user-supplied cutting parameters.

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Your inputs

01 / Enter

These are editable examples, not recommended rates. Enter your own numbers.

Calculator inputs

Changing the system relabels inputs; it does not convert their entered numbers.

Use effective diameter at the cutting depth, in the selected system. Must be positive.

Illustrative example only. Supply the tooling manufacturer or established process speed.

Positive integer appropriate to the selected milling cutter.

Illustrative example only. Supply the manufacturer or established process value.

Your result

02 / Understand

Loading the example calculation…

Show the math

Calculations retain numerical precision. Displayed quantities are rounded to significant digits, not to cents.

What this means

This tool uses the straight peripheral milling convention. Surface speed and effective cutting diameter determine RPM; RPM, effective teeth and feed per tooth determine linear table feed.

Worked example

At 10 mm effective diameter and 10π m/min cutting speed, RPM=1,000. Four effective teeth and 0.05 mm/tooth give 200 mm/min table feed. In imperial units, 1 in diameter and 100π ft/min give 1,200 RPM; two teeth at 0.001 in/tooth give 2.4 in/min.

How the math works

Metric: RPM = cutting speed(m/min)×1000/[π×diameter(mm)]. Imperial: RPM = cutting speed(ft/min)×12/[π×diameter(in)]. Table feed = RPM×effective teeth×feed per tooth. 1 in=25.4 mm and 1 ft=0.3048 m exactly.

About this estimate

User-supplied parameters only; the defaults demonstrate arithmetic, not cutting recommendations. Straight peripheral milling excludes turning feed/revolution, thread milling, chip-thinning adjustments, machine RPM/torque limits, tool overhang and material-specific decisions. Displayed fractional RPM is a calculation, not a machine setting guarantee.

Reference conventions

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Formula v1.0.0 · Reviewed · Tool ID: machining-rpm-feed