Understanding the speed relationship between driver and driven pulleys is essential when setting up belt-driven equipment. The Belt & Pulley Speed Calculator helps you quickly determine the driven shaft speed, speed ratio, belt velocity, and even approximate belt length. Just enter your driver speed, pulley diameters, and (if needed) belt slip or center distance. Whether you’re checking a pump setup, troubleshooting performance, or planning a new installation, this tool gives you the numbers you need in seconds.
Belt & Pulley Speed Calculator
Enter the driver speed and pulley diameters (use pitch/effective diameters). Optionally include V‑belt slip and center distance for belt length.
Use pitch/effective diameters from your sheave catalog. V‑belts typically slip ~1–3% at full load; timing belts ≈0%. Approx. belt length formula: \(L≈2C+(\pi/2)(D_1+D_2)+((D_2−D_1)^2)/(4C)\). Wrap angle uses standard geometry; keep ≥120–140° on the smaller sheave for torque capacity.