Pulley Speed Ratios Calc is a verified engineering & build calculation tool on Calcify. Calculate driven pulley RPM, velocity ratio, and belt surface speed (m/s) from driver RPM and pulley diameters. All calculations execute locally in your browser with multi-currency support, visual breakdowns, and white-label client exports.
Reduction Ratio: 2.00 : 1 | Linear Belt Speed: 11.31 m/s
Driven_RPM N₂ = N₁ × (D₁ / D₂); Belt_Speed (m/s) = (π × D₁ × N₁) / (60 × 1000)
Example Inputs: Driver (Motor) Pulley Diameter D₁ (mm): 150 mm · Driver Motor Speed N₁ (RPM): 1440 RPM · Driven Machine Pulley Diameter D₂ (mm): 300 mm
Example Output: Driven Pulley Output Speed (N₂): 720.0 RPM (Reduction Ratio: 2.00 : 1 | Linear Belt Speed: 11.31 m/s)
The Pulley Speed Ratios Calc on Calcify applies the verified mathematical formula: Driven_RPM N₂ = N₁ × (D₁ / D₂); Belt_Speed (m/s) = (π × D₁ × N₁) / (60 × 1000). Every input is validated in real time with multi-currency formatting to ensure zero rounding or division errors.
Assumes zero belt slip between driver and driven sheaves.
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