Calculating the conversion ratio and output speed of the gearbox, in simple terms, gearboxes are used to convert engine speed and torque, and the concept of conversion ratio plays a key role in their performance. In this guide, we will examine in a simple and understandable way how to calculate the conversion ratio and output speed of the gearbox. What is the conversion ratio? The conversion ratio or transmission ratio indicates the ability of the gearbox to reduce engine speed (in reduction gearboxes) or increase it (in increase gearboxes). This ratio is written as 1:n, which means the ratio of input to output. Conversion ratio formula To calculate the conversion ratio (i), the following formula can be used: \[ i = \frac{n