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To figure your approximate belt length, the following formula can be used: Db = [(2La + 0.5pi(D1 + D2) + (D1 - D2)2 / 4La) x (1 - Sf)] / pi Db: belt diameter La: distance between the centers of the pulleys D1: diameter of pulley #1 D2: diameter of pulley #2 Sf: Stretch factor pi: 3.14159