The image above represents theoretical value of g.

To compute for theoretical value of g, one essential parameter is needed and this parameter is **Latitude (φ).**

The formula for calculating theoretical value of g:

g = (-172 + 136sin²φ)

Where:

g = Theoretical Value of g | Standard Formula

φ = Latitude

Let’s solve an example;

Find the theoretical value of g when the latitude is 18.

This implies that;

φ = Latitude = 18

g = (-172 + 136sin²φ)

g = (-172 + 136sin²(18))

g = (-172 + 136(0.309)²)

g = (-172 + 136(0.0954))

g = (-172 + (12.986))

g = -159.01

Therefore, the **theoretical value of g **is **-159.01 mGal.**

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