Enter the axle ratio, transmission gear ratio, and transfer case ratio into the calculator to determine the final drive ratio.

## Final Drive Ratio Formula

The following formula is used to calculate the final drive ratio of a car.

DR = AR * TR * TCR
• Where DR is the drive ratio (ratio :1)
• AR is the axle ratio : 1
• TR is the transmission gear ratio : 1
• TCR is the transfer case ratio : 1

To calculate a final drive ratio, multiply the axle ratio by the transmission gear ratio, then multiply this result by the transfer case ratio.

## Final Drive Ratio Definition

A final drive ratio is defined as the final ratio between the engine rpm to the wheel rpm of a car or vehicle.

## Final Drive Ratio Example

How to calculate the final drive ratio?

1. First, determine the axel ratio.

For this example we will say the axel ratio is 5:1.

2. Next, determine the transmission ratio.

For this example the transmission ratio is 2:1.

3. Next, determine the transfer case ratio.

For this example and most cases this is 1:1 on the high end.

4. Finally, calculate the final drive ratio.

Using the equation above we find the drive ratio to be 10:1

## FAQ

What is a final drive ratio?

A final drive ratio is the ratio of the RPM of an engine to the RPM delivered to the wheels of a vehicle.