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Pulley

Belt/Pulley Drive Diameter & Speed Calculators

Overview:

Engine Pulleys Belt/Pulley Drive Diameter & Speed Calculators are an essential tool in engineering and design. They are used to quickly and accurately determine the relationship between the physical size of pulleys (diameter) and the resulting change in rotational speed (Revolutions per minute (RPM)).

Calculator for Single Belt/Pulley Drive Diameter & Speed

Instructions:

  1. Enter all but one value in available calculator fields.
  2. Choose how many decimal places you wish answer to round to, the default value is one.
  3. Press solve button to find remaining unknown value.
  4. To perform a new calculation or you wish to clear current values use the reset button to clear values and start again.
  5. The formulas used for each calculator can be viewed by expanding the 'Click to Show Formula' section below.
Two Pulley System

If pulley diameter (D1) is

pulley diameter (D2) is

pulley revolutions per minute (RPM) (S1) is

pulley revolutions per minute (RPM) (S2) is

requirements not met -
please add all but one value in available fields.

Calculation History

Note: only shows calculations performed in current session - If you refresh the page all history will be removed.

Want to convert your values to different units?
CONVERT VARIOUS UNITS HERE

Click to Show Formula
image of used formula

Calculator for Compound Belt/Pulley Drive Diameter & Speed

Instructions:

  1. Enter all but one value in available calculator fields.
  2. Choose how many decimal places you wish answer to round to, the default value is one.
  3. Press solve button to find remaining unknown value.
  4. To perform a new calculation or you wish to clear current values use the reset button to clear values and start again.
  5. The formulas used for each calculator can be viewed by expanding the 'Click to Show Formula' section below.
Two Pulley System

If pulley diameter (D1) is

pulley diameter (D2) is

pulley diameter (D3) is

pulley diameter (D4) is

pulley revolutions per minute (RPM) (S1) is

pulley revolutions per minute (RPM) (S4) is

requirements not met -
please add all but one value in available fields.

Calculation History

Note: only shows calculations performed in current session - If you refresh the page all history will be removed.

Want to convert your values to different units?
CONVERT VARIOUS UNITS HERE

Click to Show Formula
image of used formula