Free Tool by Machine Point Pulley & Belt Calculator Pulley & Belt Calculator Mode 1) Motor Pulley Size 2) Machine RPM 3) Belt & Center Distance Units mm in Decimals 0 1 2 3 Motor RPM Desired Machine RPM Machine Pulley Diameter (mm) Calculate Motor Pulley Formula: D₁ = (N₂/N₁)×D₂ Motor RPM Motor Pulley Diameter (mm) Machine Pulley Diameter (mm) Calculate Machine RPM Formula: N₂ = N₁×(D₁/D₂) Motor Pulley Diameter (mm) Machine Pulley Diameter (mm) Center Distance C (mm) Belt Length from C Belt Length L (mm) Center C from L L ≈ 2C + (π/2)(D₁+D₂) + (D₁−D₂)²/(4C)
