Pulley Calculator
3. Belt length. The length of the belt is dependent on the diameters of both pulleys and the distance between their centers D: L = (d₁ × π / 2) + (d₂ × π / 2) + 2D + ((d₁ - d₂)² / 4D) You can also reverse this formula to calculate the distance between the pulleys for a known belt length. 4. Belt tension