An open-belt drive transmits rotation between pulleys through belt tension and wrap. Pulley diameters and centre distance determine approximate belt length and wrap angles, while speed ratio follows pitch diameters; tension, slip, belt section, power capacity, and alignment need separate design checks.
Belt Length Calculator applies this concept to its defined inputs and workflow. It can be used as a local belt length calculator to estimate a belt-drive layout before selecting standard belt length, tension adjustment range, supplier data, guarding, or final CAD package.
The calculator evaluates open belt length, center-distance check, and wrap-angle estimate and returns belt length, wrap angles, center distance, and warnings using the stated method. The selected units and sign or reference conventions must describe one consistent physical case. Users should interpret the output within the assumptions shown on the page and repeat the check with trusted reference values when the result affects engineering or research decisions. No belt tension, slip, power rating, tooth pitch, pulley groove, heat, guarding, or supplier catalog selection is included.