Ad Supported.
This Application can calculate the actual gravity value relative to the latitude using International Gravity Formular WGS84.
Press "Get Gravity" to get the value of gravity in m/s^2 in specific location.
Note: The Value is only valid at sea level, future version will also support calculation along with Altitude and Depth.
Read more: http://en.wikipedia.org/wiki/Gravity_of_Earth