Power transmission calculator
Belt Length Calculator
Calculate open-drive belt pitch length or centre distance using pulley pitch diameters. Results are an initial selection aid and must be checked against manufacturer information.
Belt Pitch Length & Centre Distance
Enter both pulley pitch diameters and either centre distance or belt pitch length.
Use pitch diameters: not the outside diameters of V-belt pulleys. This calculator assumes an open, two-pulley drive.
Result will appear here.
Calculation assumptions
Uses the standard approximate open-belt pitch-length equation. The nearest commercially available belt may require centre-distance adjustment. Confirm belt section, allowable speed, wrap angle and manufacturer recommendations before ordering.