Open Belt Length Calculator
Estimate the length of an open belt connecting two pulleys.
in
in
in
—Enter measurements to calculate
How the calculation works
L = 2C + π(D+d)/2 + (D−d)²/(4C).
Example
Eight- and three-inch pulleys on 18-inch centers need about a 53.6-inch belt.
When to use this calculator
Use it for shop machines, fans, grinders, and custom belt-drive layouts.
Results are planning estimates. Verify critical dimensions, machine settings, material specifications, and local code requirements before work begins.
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