# Ellipsoid - Surface Area

vCalc Reviewed
SA =
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ID
vCalc.Ellipsoid - Surface Area
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2843a3c8-31ed-11e4-b7aa-bc764e2038f2

The Surface Area of an Ellipsoid calculator uses the Knud Thomsen's formula to compute an approximation of the surface area of an ellipsoid based on the lengths of the semi-axes.

INSTRUCTIONS: Choose units and enter the following:

• (a) the length of semi-axis a
• (b) the length of semi-axis b
• (c) the length of semi-axis c

Surface Area of an Ellipsoid (SA): The calculator returns the surface area in square meters.  However, this can be automatically converted to many other area units (e.g. square inches or acres) via the pull-down menu.

#### The Math / Science

SA = 4*pi* ( ((a*b)^1.6075 + (a*c)^1.6075 + (b*c)^1.6075)/3)^(1/1.6075)

where: