About this site

Feeds and Speeds Calculator is a free, no signup tool for finding a starting spindle speed and feed rate for CNC milling and drilling. It runs entirely in your browser and does not require an account.

The goal is speed and clarity on a phone at the machine: pick a material, enter your cutter, and get RPM and feed in seconds. Switch between inch and metric without reloading, copy a shareable link, or print a shop ticket.

All material values are editorial estimates gathered from public machining references. They are starting points, not a guarantee of any result. See the methodologyfor the formulas and sources.

Use this tool alongside, never instead of, your tooling manufacturer data and machine manual. A wrong feed or speed can break tools or cause injury.