The 2nd Pulley RPM calculator computes the RPMs of a second pulley based on the the RPMs and Diameter of the first pulley and the diameter of the second pulley. 
INSTRUCTIONS: Choose units and enter the following:
- (RPM1) RPMs of First Pulley
- (D1) Diameter of First Pulley
- (D2) Diameter of Second Pulley
2nd Pulley RPMs (RPM2): The calculator returns the rotational velocity of the second pulley in revolutions per minute (RPMs). However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The rotation rate of the two pulleys are interconnected by the fact of a belt or chain running on the perimeter of the two pulleys. This means that the rotation rate of pulley 1 and its diameter will dictate the belt speed. Based on the belt speed and the diameter of the second pulley, you can compute the rotation rate of the second pulley. The formula for the 2nd pulley rotation rate is:
RPM2 = (D1/D2)⋅RPM1
where:
- RPM2 = Rotation rate of second pulley
- D2 = Diameter of second pulley
- RPM1 = Rotation rate of first pulley
- D1 = Diameter of first pulley
Simple Machine Calculators
- Lever Beam Length
- Leverage Lift Weight
- Fulcrum Position
- Belt Length
- Belt Speed
- RPMs to Linear Velocity
- RPMs from linear velocity and diameter
- 2nd Pulley RPMs
- 2nd Pulley Diameter
- RPM of 4th pulley on three shafts
- 2nd Gear RPM
- Sum of Two Lengths
- Second Gear Torque
Spanish Versions (Otras Calculadoras)
- Circular Motion - Esta calculadora usa las ecuaciónes para el movimiento circular.
- La Longitud de la Correa - Esta calculadora computa la longitud de la correa alrededor de los dos poleas.
- La Velocidad de la Correa - Esta calculadora computa la velocidad de la correa basarse en el diámetro y los RPMs.
- Segundo Polea (RPM) - Esta calculadora computa los revoluciónes por minuto o RPMs del segundo polea basarse en los RPMs y el diámetro del primero polea y el diámetro del segundo polea.
- Polea Para Correa (RPM) - Esta calculadora computa los revoluciónes por minuto o RPMs de la polea basarse en el diámetro y la velocidad de la correa.