# Gear Ratio Calculator

Gear ratio is also called as speed ratio. The number of teeths on each gear determines the speed ratio or gear ratio. Number of teeths on a gear is usually proportional to the radius of gear pitch circle. So, the ratio of the size of the gear to the number of teeths in a gear will be the same no matter what the size of the gear is.

## Gearbox Ratio Calculation

Gear ratio is also called as speed ratio. The number of teeths on each gear determines the speed ratio or gear ratio. Number of teeths on a gear is usually proportional to the radius of gear pitch circle. So, the ratio of the size of the gear to the number of teeths in a gear will be the same no matter what the size of the gear is.

Code to add this calci to your website

#### Formula:

GF = (eRPM * h * 0.002975) / a
MPH = GF / GR
**Where,**
GF = Gear Factor
GR = Gear Ratio
eRPM = Engine RPM (Revolution per Minute)
h = Tire Height
a = Axle Ratio
MPH = Miles per Hour