Pulley Speed & Ratio Calculator
Calculate drive ratio i, driven pulley RPM, belt linear velocity v (m/s), and torque multiplication factor.
0% for timing belts / chains; 1%–3% for V-belts
Results
| Drive Ratio i (D2 / D1) | — |
| Driven Shaft Speed n2 | — RPM |
| Belt Linear Velocity v | — m/s |
| Ideal Torque Multiplier | — × |
| Drive Status | — |
Formulas
Ratio: i = D2 / D1
Driven RPM: n2 = n1 × (D1 / D2) × (1 - S/100)
Belt Speed: v = (π × D1 × n1) / (60 × 1000) (m/s)
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