Usually, if we notice any change in the velocity of an object it is known to be accelerating. Thus, acceleration is defined as the rate of change of velocity of an object with respect to time. Accelerations are vector quantities meaning they have magnitude and direction. So how do we measure acceleration or what is the unit of acceleration? We will find answers to these questions below.

## SI Unit of Acceleration

When we calculating acceleration it basically involves velocity and time factor and dividing them in terms of units, meters per second [m/s] by second [s]. Moreover, dividing distance by time twice is equal to dividing distance by the square of time. Therefore, the SI unit of acceleration is the meter per second squared or (m s−2).

### Other Acceleration Units

Another frequently used unit is based on acceleration due to gravity. The unit called acceleration due to gravity is represented by a roman g. However, students have to keep in mind that it is not the same as the natural phenomena called acceleration due to gravity which is represented by an italic g. Most of the time, people refer to change in velocity as “g-force”. Here, the g is a measure of acceleration and not force. Some of the other units include Foot per second squared, Galileo or gal, orders of magnitude, standard gravity and plank acceleration.

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