# Number of Teeth

on . Posted in Gear

Number of teeth, abbreviated as $$n_t$$, is the number of teeth contained in a gear.

## Number of Teeth formula

$$\large{ n_t = DP \; PD }$$
Symbol English Metric
$$\large{ n_t }$$ = number of teeth $$\large{dimensionless}$$
$$\large{ DP }$$ = dimetrical pitch $$\large{in}$$ $$\large{mm}$$
$$\large{ PD }$$ = pitch diameter $$\large{in}$$ $$\large{mm}$$

## Number of Teeth formula

$$\large{ n_t = \frac{ \pi \; PD }{ CP } }$$
Symbol English Metric
$$\large{ n_t }$$ = number of teeth $$\large{dimensionless}$$
$$\large{ CP }$$ = circular pitch $$\large{in}$$ $$\large{mm}$$
$$\large{ PD }$$ = pitch diameter $$\large{in}$$ $$\large{mm}$$
$$\large{ \pi }$$ = Pi $$\large{3.141 592 653 ...}$$

Tags: Gear Equations