Calculator · Machines & tooling
Pulley Speed Calculator
The free Pulley Speed Calculator answers one question: Output RPM from motor speed and pulley sizes. Enter your numbers in inches or millimeters and the result updates instantly in your browser, with no sign-up and no app to install. Use it on your phone at the bench, then copy or print the result for your cut list.
For lathes, drill presses and shop-built machines with belt drives.
Which other machines & tooling calculators help with this project?
- Band Saw Blade Length Calculator — Blade length from wheel size and center distance.
- Band Saw Blade Radius Calculator — Tightest curve each blade width can cut.
- Saw Blade Rim Speed Calculator — Tip speed of a saw blade or sanding disc.
- CNC Feed Rate Calculator — Feed rate from RPM, flutes and chip load.
What you'll need for this project
Tools
Screws & hardware
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Build it · Beginner · Half a day
Download the complete plan with cut list and materials list (PDF)
Drill Press Table & Speed Chart — Auxiliary drill-press table with fence, plus a pulley speed chart for your press. Drawings, cut list with board-foot totals, hardware list and step-by-step instructions.