Enter the larger belt diameter (in) and the smaller belt diameter (in) into the Belt Ratio Calculator. The calculator will evaluate and display the Belt Ratio.

## Belt Ratio Formula

The following formula is used to calculate the Belt Ratio.

BLR = LD / SD
• Where BLR is the Belt Ratio
• LD is the larger belt diameter (in)
• SD is the smaller belt diameter (in)

To calculate the belt ratio, divide the larger belt diameter by the smaller belt diameter.

## How to Calculate Belt Ratio?

The following example problems outline how to calculate Belt Ratio.

Example Problem #1:

1. First, determine the larger belt diameter (in).
• The larger belt diameter (in) is given as: 2.5.
2. Next, determine the smaller belt diameter (in).
• The smaller belt diameter (in) is provided as: 1.5.
3. Finally, calculate the Belt Ratio using the equation above:

BLR = LD / SD

The values given above are inserted into the equation below and the solution is calculated:

BLR = 2.5 / 1.5  = 1.667

Example Problem #2:

For this problem, the variables required are provided below:

larger belt diameter (in) = 6

smaller belt diameter (in) = 3