Most people tend to think that mass and weight are the same but they are different. By definition we can define mass as the amount of matter present in a body and its SI unit is kilogram (Kg) while weight is a measure of how strongly gravity pulls on that matter and its SI unit of mass is newton (N).
From the formula to calculate weight:
![How to Calculate Mass from Weight.](https://www.learntocalculate.com/wp-content/uploads/2020/04/calculate-mass-from-weight.png)
We get;
![How to Calculate Mass from Weight.](https://www.learntocalculate.com/wp-content/uploads/2020/04/calculate-mass-from-weight.png-2.png)
Gravity is a force that tends to attract objects to the centre of the earth.
Example:
Calculate the mass of a laptop whose weight on earth is 20N . (Gravitational force = 9.8 N)
![How to Calculate Mass from Weight.](https://www.learntocalculate.com/wp-content/uploads/2020/04/calculate-mass-from-weight-1.png-3-1.png)
Therefore, the mass of the laptop is 2.04 Kg.