Belt Length Calculator

Calculate the total length of a belt path for a two-pulley system.

Pulley System Parameters

Large Pulley Diameter (D)

Small Pulley Diameter (d)

Center Distance (C)

Unit

Calculation Results

Enter parameters to calculate

Quick Reference

DLarge pulley diameter

dSmall pulley diameter

CDistance between centers

1.57Approximate value of π/2

Overview

This calculator determines the length of a belt required to connect two pulleys based on their diameters and the distance between their centers.

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Pro Tips

Ensure all measurements are in the same units (inches, mm, etc.).
The formula assumes an 'open' belt path (not crossed).
Always allow for some adjustment in the center distance for belt tensioning.

Fun Facts

"V-belts are designed to 'wedge' into the pulley, providing more friction than flat belts."
"The distance between pulleys should generally be greater than the diameter of the larger pulley."
"A crossed belt setup reverses the direction of the second pulley."

Formula: L ≈ 2C + 1.57(D+d) + (D-d)²/(4C)

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