Pulley Size Calculator.

This calculator determines pulley sizes
to obtain a desired output RPM.
Simply input driven speed and
pulley sizes. Belt length is also
calculated.

Pulley Size Calculator


Easily calculate pulley speeds, sizes of pulleys
and belt length.




Entry Form

Driver: RPM

Driver Pulley: Inches

Driven Pulley:Inches

Distance:Center to Center




Answer

Output:RPM

Belt Length:Inches

Belt Length:Centimeters




How To Use This Pulley
and Belt Size Calculator.


Enter the motor speed in RPMs.

Enter the motor pulley size

Enter the driven Pulley size

Adjust the pulley size on both, to achieve
a certain rpm output.

More than one stages of pulley speeds
can be calculated (compound drive system).
The output of the first stage, becomes the
input for the next stage.

Note, idler pulleys, have no bearing on
speed changes, they only provide tension
to the belt.

Tip


Smaller pulleys have greater chance of
belt slippage.

The smaller the pulley the greater the flex,
of the belt and greater the wear.

Less power is lost where larger pulleys
are used.

Pulleys diameter, is measured across
the pulley, from outside edge , to outside
edge.

Belt calculated length is from the outside
pulley diameter width.


Something to Consider
With a two pulley system, there is a
10% lose of power.
When the pulley system is a gear up
arrangement, there is a power lose
of 15%.




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Calculate Pulley Sizes, for a Desired
RPM Output and Determine Belt Length
at find_N_choose.