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

Enter a value for all fields

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**) semi-axis a - (
**b**) semi-axis b - (
**c**) 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 Knud Thomsen formula for the surface area of an ellipsoid is:

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

where:

- SA is the surface area of the ellipsoid
- a, b and c are the lengths of the semi-axes of the ellipsoid.

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