Belt Length Calculator
V-belt or timing belt length from pulley geometry
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Belt length calculator
Calculate V-belt or timing belt length from pulley geometry.
How to use this tool
- 1
Enter pulley diameters
Both pulleys — larger and smaller.
- 2
Enter center distance
Distance between pulley shaft centers.
- 3
See belt length
Exact math and common formula.
Frequently Asked Questions
Which formula is used?
Exact: L = 2C + π/2(D1+D2) + (D1-D2)²/(4C). Where C = center distance, D = pulley diameters.
V-belt vs timing belt
This calculator gives geometric length. V-belts need to match standard sizes. Timing belts need integer teeth count.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.