Enter the transmission ratio, transfer case ratio, and the axle gear ratio to calculate the crawl ratio.

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## Crawl Ratio Formula

The following formula is used to calculate a crawl ratio.

CR = TR* TCR * AGR

- Where CR is the crawl ratio
- TR is the transmission ratio
- TCR is the transfer case ratio
- AGR is the axle gear ratio.

To calculate the crawl ratio, multiply the transmission ratio, transfer case ratio, and axle gear ratio together.

## Crawl Ratio Definition

A crawl ratio is a measure of the number of rotations an engine makes in order to turn a tire one full rotation.

## Crawl Ratio Example

How to calculate a crawl ratio?

**First, determine the transmission ratio.**Measure the transmission ratio.

**Next, determine the TCR.**Calculate the transfer case ratio.

**Next, determine the AGR.**Calculate the axle gear ratio.

**Finally, calculate the crawl ratio.**Calculate the crawl ratio using the equation above.

## FAQ

**What is a normal crawl ratio?**

Normal crawl ratios on cars range from 20:1 to 30:1