Belt Drive Ratio & Length
Calculate the speed ratio, driven speed, belt length, wrap angle and belt speed of a two-pulley belt drive, free online.
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Speed ratio = driven diameter ÷ driver diameter; driven rpm = driver rpm ÷ ratio. Open-belt length L ≈ 2C + π(D + d)/2 + (D − d)² ÷ 4C. Wrap angle on the small pulley = 180° − 2·asin((D − d) ÷ 2C); keep it above about 120°. Belt speed v = π·d·n.