Enter the crankshaft pulley diameter (in) and the alternator pulley diameter (in) into the Calculator. The calculator will evaluate the Alternator Pulley Ratio.

## Alternator Pulley Ratio Formula

APR = CPD / APD

Variables:

- APR is the Alternator Pulley Ratio (in/in)
- CPD is the crankshaft pulley diameter (in)
- APD is the alternator pulley diameter (in)

To calculate Alternator Pulley Ratio, divide the crankshaft pulley diameter by the alternator pulley diameter.

## How to Calculate Alternator Pulley Ratio?

The following steps outline how to calculate the Alternator Pulley Ratio.

- First, determine the crankshaft pulley diameter (in).
- Next, determine the alternator pulley diameter (in).
- Next, gather the formula from above = APR = CPD / APD.
- Finally, calculate the Alternator Pulley Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

crankshaft pulley diameter (in) = 200

alternator pulley diameter (in) = 100