Open Two-Pulley Belt Length Calculator
Calculate ideal open-belt length from pulley diameters and center distance.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Open Two-Pulley Belt Length Calculator
Enter effective belt-path diameters and the distance between shaft centers. The geometry follows straight external tangents and circular arcs around two separated pulleys.
The calculation
Worked example
200 mm and 100 mm pulley diameters, 500 mm center distance give an ideal open belt length of about 1,476.2431 mm.
Assumptions and limits
Requires nonoverlapping pulleys and large diameter at least as large as the small diameter. Tension, belt thickness, groove geometry and standard purchase lengths are excluded.
Common questions
Which inputs should I use?
Enter effective belt-path diameters and the distance between shaft centers. The geometry follows straight external tangents and circular arcs around two separated pulleys.
What does the result exclude?
Requires nonoverlapping pulleys and large diameter at least as large as the small diameter. Tension, belt thickness, groove geometry and standard purchase lengths are excluded.