Belt Length Calculator

Belt Size Calculator Method One 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.)

Belt Cut Length:

*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

Welcome to our Belt Length and Size Calculator!

Are you looking for a convenient tool to determine the length and size of your belts? Look no further! Our Belt Length and size calculator is here to assist you.

With our user-friendly interface, calculating the length and size of your belts is quick and easy. Simply input the necessary parameters, such as pulley diameters, center distance, and belt type, and our calculator will provide accurate results.

Whether you need to calculate the length and size of V belts or timing belts, our calculator has you covered. We understand the importance of finding the right fit for your machinery, and our calculator ensures precise measurements for optimal performance.

If you prefer working with spreadsheets, we've got you covered as well. Our Belt Length Calculator Excel tool provides the convenience of using familiar software while delivering accurate belt size calculations. Simply download the Excel file, enter the relevant data, and let the formulas do the math for you.

We're dedicated to simplifying the process of belt size calculations. Our Belt Length and Size Calculator is designed to save you time and ensure a proper fit for your application.

Start using our Belt Length and Size Calculator today and take the guesswork out of finding the perfect belt length and size. Achieve optimal performance with confidence!


Belt Length Calculator Method Two: Use when belt's ID, OD, IC, OC or Cut Length are known. (Enter cut length and cross-section, and it workds backwards.) Do NOT use on used belts because they are permanently stretched. Use only to 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 Length Calculator:

Timing Belt Length Calculator Method Three:
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%)

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%)

Timing Belt Size 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)].
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%)

Belt Cut Length:

Belt Length Calculator

Belt Size Calculator Method One

Belt Length Calculator Method Two:

Timing Belt Length Calculator Method Three:

Timing Belt Size Calculator Method Four:

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