The normal values for gravitational acceleration used in physics and engineering are:

*g = 9.8066 m/s ^{2}*

* g = 32.1740 ft/s ^{2}*

## Poles and Equator

Because g varies from the poles to the equator, here are the extreme values:

North and South Poles: *g = 9.832 m/s ^{2} = 32.26 ft/s^{2}*.

Equator:

*g = 9.780 m/s*.

^{2}= 32.09 ft/s^{2}## Standard Gravity

The term * standard gravity* refers to the gravitational acceleration at the point half way between the poles and equator (45

^{o}latitude), at sea level.

If you know your latitude, you can calculate the actual gravitational acceleration constant as follows:

$latex g_{surface} = g (1 + (5.305\times 10^{-3})sin^2\phi – (5.9\times 10^{-6})sin^2 2\phi)$

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