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