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Belt Tension Calculator

We recommend stretching most unreinforced belts at least 5%, but some belts like Van de Graaf generator belts work best when stretched 1%.  The calculated tensions are less accurate below 5% stretch because the tension curve becomes nonlinear and less consistent.   Do not use this calculator to estimate tension for reinforced belts.
Force to stretch a Urethane Round Belt
Select a Durometer:
Stretch %  (enter 10 for 10%)
Cross section diameter (inches)
     Help
   Belt Tension (lbs.)

   After 1 week the tension drops to (lbs.)
   and remains relatively constant thereafter.


 
Force to stretch a Urethane Flat Belt:
Select a Durometer: /95A
Stretch %  (enter 10 for 10%)
Thickness (inches)
Width (inches)
     Help
   Belt Tension (lbs.)
   After 1 week the tension drops to (lbs.)
   and remains relatively constant thereafter.

Enter one:
Kg:       Lbs:
   
Enter one:
Inches:      mm:
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