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Belt Length Calculator

(i.e., Belt Cut Length Calculator)
Method One:
Use when belt's cross-section diameter and any one of these dimensions (ID, OD, IC, OC or Cut Length) are known. (Enter cut length and cross-section, and it works backwards.) Do NOT use on used belts because they are permanently stretched. Use only to verify or duplicate unused belts.
 
Enter round belt cross-section diameter,
V-belt height, or flat belt thickness.
 
Please enter ONE of the following:
Inside Diameter (ID):
Outside Diameter (OD):
Middle Pitch Diameter (PD):
Inside Circumference (IC):
Outside Circumference (OC):
Belt Cut Length:
 
      Help
 
belt length calculator
Enter one:

 
Method Two:
Wind a string around the belt path.
 
String length:
String cross-section diameter:
Enter round belt cross-section diameter,
V-belt height, or flat belt thickness.
Stretch factor: (e.g. Enter 10 for 10%)
     Help
Belt Cut Length:

Typical Stretch Factors for Round and V-belts.
Do NOT use on flat belts.
Use Tension Calculator instead.
Cyclothane-A 83A 10% (8% - 14%)
Cyclothane-B 85A High Tension 20% (17% - 22%)
Cyclothane-A 88A HEHT 24% (18% - 25%)
Cyclothane-A 88A/90A matte green/blue 11% (8% - 16%)
Cyclothane-A 90A Super Red 15% (9% - 15%)
Cyclothane-A 92A 7.5% (7% - 12%)
Cyclothane-A 70A 15% (12% - 18%)
Cyclothane-E 85A 12.5% (10% - 14%)
Hytrel 92A 7% (5% - 8%)
Cyclothane 90ASD Anti-Static 9% (8%-10%)
Twisted 83A belts (coiled like a spring) 18% (15%-28%)
Flat belts width dependent use Tension calculator (1/2%-10%)
All Polyester Reinforced Belts 1% (1/2% - 2%)
Enter one:

 
Printable View
Method Three:
Two Pulley System.  For O-rings, Flat belts, V-belts
Enter round belt cross-section diameter,
V-belt height, or flat belt thickness.
Diameter of Pulley 1:
Groove depth of Pulley 1:
Diameter of Pulley 2 (or spool):
Groove depth of Pulley 2:
Center distance between pulleys:
Stretch factor:
(Enter 10 for 10%.  Most lineshaft conveyors use 12%)
See Typical Stretch Factors on Method 2 above.
Angle between pulleys in degrees:
(e.g. 0 for roller-to-roller,  90 for line-shaft.)
     Help
Belt Cut Length:
pulley belt length calculator pulley belt length calculator
Enter one:

 
*If the belt rests on the pulley’s root diameter (bottom of the pulley), enter the outside diameter of the pulley and the groove depth.  Alternately, enter the Root Diameter of the pulley and zero for groove depth. Either way you will get the same answer. If the belt wedges in a V-pulley and does not rest on the root diameter, enter the diameter that is defined by the belt’s outside edge. For the groove depth, enter the belt’s thickness. In all cases the program will automatically calculate the belt’s cut length.
Quick Link to Tension Calculator

Method Four:
For tracking sleeves, groove sleeves, roller sleeves, spacers, tires, and urethane spool flanges.
Stretch is critical and varies widely, so before ordering large quantities request a sample to make sure it fits.
 
Diameter of Roller:  [If less than 1.5" (38mm), click here].
Groove depth: (Depth below roller surface -- Zero for spacers, flanges, tracking and roller sleeves.)
Enter round belt cross-section diameter, V-belt height, or flat belt thickness.
Stretch factor: (.031" x 1/2" 92A tracking sleeves = 7.5%, .062" x 1" 83A tracking sleeve = 10%.  Roller sleeves = 2%.  Enter 7.5 for 7.5%)
     Help
Belt Cut Length:
Enter one:

 
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