The 2nd Pulley Diameter equation calculates the diameter of a second pulley based on the RPMs and Diameter of the first pulley and the RPMs of the second pulley. Belt length around two pulleys. 

INSTRUCTIONS: Choose units and enter the following:

• (RPM_d) The RPMs of pulley 1.
• (D_d) The diameter of pulley 1.
• (RPM_D) The RPMs of pulley 2.

2nd Pulley Diameter (D_D):   The calculator computes the diameter of pulley 2 (D_D) in meters.  However this can be automatically converted to other length units via the pull-down menu.

Simple Machine Calculators

• Lever Beam Length 
• Leverage Lift Weight 
• Fulcrum Position 
• Belt Length 
• Belt Speed.
• Pulley RPMs 
• 2nd Pulley RPMs
• 2nd Pulley Diameter 
• RPM of 4th pulley on three shafts 
• 2nd Gear RPM 
• Sum of Two Lengths