Belt Length Calculator
V-belt length between two pulleys.
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Results
- Belt length
- 58.49 in
- In millimetres
- 1486 mm
- Speed ratio
- 2.5:1
- Wrap angle (small)
- 160.8°
Quick answer
Belt length combines the wrap around both pulleys and twice the centre distance.
L = 2C + π(D+d)/2 + (D−d)²/(4C)
How to use the Belt Length Calculator
- 1Measure both pulley diameters.
- 2Measure the centre-to-centre distance.
- 3Order the nearest standard belt above the result.
Frequently asked questions
Should I round up or down?
Round to the nearest standard size and use the tensioner for adjustment.
Does wrap angle matter?
Below 120° on the small pulley, belts start slipping.