This calculator calculates the volume of liquid inside a Horizontal Cylindrical Container with Ellipsoidal Ends for any given Height of Liquid. The other required values are the Diameter of Cylinder, Straight Length, and the Distance X of ellipsoidal end. For a tank with an ellipsoidal end of 2:1 ratio use a Distance X that is one fourth the Diameter of Cylinder. For a tank with hemispherical ends use a Distance X that is one half the Diameter of Cylinder. For a flat end tank input zero for Distance X. For an ellipsoidal tank with no Straight Length input zero for Straight Length.