The Engineer's Ephemeris

Speeds and Feeds Calculator

Set the right cutting parameters in seconds. This speeds and feeds calculator computes spindle RPM from cutting speed and tool diameter, and suggests feed rate from feed per tooth, flutes, and RPM for both milling and turning. Choose imperial or metric units, pick your material, and refine for tool coating and rigidity to improve surface finish, minimize chatter, and extend tool life.

Toggle units — the calculator preserves and converts your current values.
Material selection auto-fills recommended cutting speed and chip load.
Note: Calculations update live. All values are preserved when switching units.
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