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Belt-Drive Pulleys
Belt-Drive Pulleys
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Overview
This basic calculator allows you to quickly determine the required pulley diameters for a required output rpm.
DH is the high speed pulley diameter, DL is the low speed pulley diameter, NH is the high speed rpm, and NL is the low speed rpm.
Note: The high speed pulley will always the smaller of the two diameters.
Short
Long
Calculator
Input 3 of 4 variables to solve for the unknown.
Help
Symbol
Variable
Input
Units
D
_{H}
High Speed Pulley Diameter
inches
millimeters
centimeters
feet
meters
D
_{L}
Low Speed Pulley Diameter
inches
millimeters
centimeters
feet
meters
N
_{L}
Low Speed RPM
revolutions/minute
revolutions/seconds
revolutions/hour
radians/second
radians/minute
radians/hour
hertz
cycles/second
cycles/minute
cycles/hours
N
_{H}
High Speed RPM
revolutions/minute
revolutions/seconds
revolutions/hour
radians/second
radians/minute
radians/hour
hertz
cycles/second
cycles/minute
cycles/hours