Free Engineering Tool #088
V-Belt Selection Calculator
Select V-belt cross-section and calculate the number of belts needed. Belt profiles per ISO 4184; power ratings based on typical manufacturer catalogue data. Enter power, speed, service factor, and pulley diameter.
Results
Design Power
Number of Belts
Where C₁ is wrap angle factor, C₃ is belt length factor, and Pb is the basic power rating per belt.
V-Belt Cross-Section Selection Guide
| Profile | Type | Top Width | Power Range (typical) | Min Pulley ⌀ |
|---|---|---|---|---|
| Z | Classical | 10 mm | 0.2 – 4 kW | 50 mm |
| A | Classical | 13 mm | 0.5 – 15 kW | 75 mm |
| B | Classical | 17 mm | 2 – 55 kW | 125 mm |
| C | Classical | 22 mm | 10 – 150 kW | 200 mm |
| D | Classical | 32 mm | 40 – 500 kW | 355 mm |
| SPZ | Narrow | 9.7 mm | 0.5 – 8 kW | 63 mm |
| SPA | Narrow | 12.7 mm | 1.5 – 30 kW | 90 mm |
| SPB | Narrow | 16.3 mm | 5 – 80 kW | 140 mm |
| SPC | Narrow | 22 mm | 20 – 250 kW | 224 mm |
Tip: Narrow V-belts (SPZ, SPA, SPB, SPC) offer 30–50% more power capacity per belt than classical sections and are recommended for new designs.
Professional field balancing instruments and software. Used in 50+ countries.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
