The **gravity of Earth**, denoted **g**, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in meters per second squared (in symbols, m/s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1). It has an approximate value of 9.81 m/s2, which means that, ignoring the effects of air resistance, the speed of an object falling freely near the Earth's surface will increase by about 9.81 metres (32.2 ft) per second every second. This quantity is sometimes referred to informally as *little g* (in contrast, the gravitational constant *G* is referred to as *big G*).

There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth, given by the equation *ma* = *F* (*force* = *mass* × *acceleration*). However, other factors such as the rotation of the Earth also contribute to the net acceleration.