Last updated: April 2026
Calculate the required belt length for two-pulley drive systems used in conveyor belts, heat sealers, packaging machines, and industrial equipment. Enter your pulley diameters and centre distance to get an instant belt length calculation using the standard engineering formula.
This calculator supports both flat belts and V-belts, giving you the exact length needed to order replacement belts for your machinery. All measurements are in millimetres for precision.
Belt Length Formula
The standard formula for calculating belt length in a two-pulley system is:
Where L = belt length, C = centre distance, D = large pulley diameter, and d = small pulley diameter.
PTFE Belts for Packaging Equipment
If you're replacing belts on packaging or heat sealing equipment, GORTEF supplies custom-cut PTFE heat sealing belts and heavy-duty belting fabrics to exact lengths. Our PTFE-coated belts offer excellent non-stick properties and withstand continuous temperatures up to 260°C.
Frequently Asked Questions
Measure from the centre of one pulley shaft to the centre of the other pulley shaft. If this is difficult to access, you can measure from the nearest edges of the two pulleys and add half of each pulley diameter to get the centre-to-centre distance.
Yes. The calculated length is the theoretical pitch length. For belts that require a mechanical join or overlap splice, add 50-100 mm depending on the joining method. GORTEF supplies belts with various join types including butt joins, overlap joins, and alligator lacing.
Yes. This calculator works for any two-pulley belt system including PTFE coated conveyor belts, heat sealer belts, and timing belts. For PTFE belts used on packaging equipment, contact GORTEF for custom-cut belts to your exact calculated length.
