Belt & Pulley Calculator
Calculate driven pulley speed, belt speed and open-belt length from pulley diameters, RPM and center distance.
rpm
Formula
N₂ = N₁ × D₁ ÷ D₂; v = π D₁ N₁ ÷ 60; L ≈ 2C + π(D₁ + D₂)/2 + (D₂ − D₁)² ÷ 4CCalculate driven pulley speed, belt speed and open-belt length from pulley diameters, RPM and center distance.
N₂ = N₁ × D₁ ÷ D₂; v = π D₁ N₁ ÷ 60; L ≈ 2C + π(D₁ + D₂)/2 + (D₂ − D₁)² ÷ 4C