Acceleration due to gravity is usually equal to 9.8 m/s² (meters per second squared) near the Earth's surface. This value is often rounded to 10 m/s² for simplicity in calculations.

However, it's important to note that:

* The exact value varies slightly depending on location. It's slightly lower at higher altitudes and at the equator due to Earth's rotation and the shape of the Earth.

* This value refers to the acceleration due to Earth's gravity. Other celestial bodies have different gravitational accelerations.