The Mass or Weight of an Oblate Spheroid calculator computes the volume of an oblate spheroid based on the semi-major(b) and semi- minor (c) axis with the assumption that the spheroid is generated via rotation around the minor axis (see diagram). 
INSTRUCTIONS: Choose your length units for a and b (e.g. feet, meters, light-years), and enter the following:
- (b) - semi-major axis, the distance from the oblate spheroid's center along the longest axis of the spheroid
- (c) - semi-minor axis, the distance from the oblate spheroid's center along the shortest axis of the spheroid
- (mD) - the mean density of the substance comprising the oblate spheroid.
Oblate Spheroid Mass / Weight: The mass (M) is returned in kilograms. However, this can be automatically converted to other mass and weight units (e.g. tons, pounds) via the pull-down menu.
Ellipsoid Calculator
- Ellipsoid - Volume computes the volume of an ellipsoid based on the length of the three semi-axes (a, b, c)
- Ellipsoid - Surface Area computes the surface area of an ellipsoid based on the length of the three semi-axes (a, b, c)
- Ellipsoid - Mass or Weight computes the mass or weight of an ellipsoid based on the length of the three semi-axes (a, b, c) and the mean density.
- Oblate Spheroid - Volume computes the volume of an Oblate Spheroid based on the length of the two semi-axes (b, c)
- Oblate Spheroid- Surface Area computes the surface area of an Oblate Spheroid based on the length of the two semi-axes (b, c)
- Oblate Spheroid- Mass or Weight computes the mass or weight of an Oblate Spheroid based on the length of the two semi-axes (b, c) and the mean density.
- Sphere - Volume computes the volume of a sphere based on the length of the radius (a)
- Sphere - Surface Area computes the surface area of a sphere based on the length of the radius (a)
- Sphere - Mass or Weight computes the mass or weight of a sphere based on the length of the radius (a) and the mean density.
NOTES
The oblate spheroid is an ellipsoid that can be formed by rotating an ellipse about its minor axis. The rotational axis thus formed will appear to be the oblate spheroid's polar axis. The oblate spheroid is fully described then by its semi-major and semi-minor axes.
One important shape in nature that is close to (though not exactly) an oblate spheroid is the Earth which has a semi-minor axis (c) which is the polar radius of 6,356 kilometers, and a semi-major axis (b) which is the equatorial radius of 6,378 kilometers. Consideration: what force would make the equatorial radius larger than the polar radius?
Density of Metals
- Density of Aluminum - 2700.0 kg/m³
- Density of Brass - 8530.0 kg/m³
- Density of Bronze - 8150.0 kg/m³
- Density of Chromium - 7190 kg/m3
- Density of Cobalt - 8746 kg/m3
- Density of Copper - 8920.0 kg/m³
- Density of Gallium - 5907 kg/m3
- Density of Gold - 19300.0 kg/m³
- Density of Iron - 7847.0 kg/m³
- Density of Lead - 11340.0 kg/m³
- Density of Nickle - 8908 kg/m3
- Density of Palladium - 12160.0 kg/m³
- Density of Platinum - 21450.0 kg/m³
- Density of Steel - 7850.0 kg/m³
- Density of Silver - 10490.0 kg/m³
- Density of Titanium - 4500.0 kg/m³
- Density of Tungsten - 19600.0 kg/m³
- Density of Zinc - 7135.0 kg/m³
- Density of Zirconium - 6570.0 kg/m³
Related Calculators
The following table contains links to calculators that compute the volume of other shapes:
| Other Volume Calculators | |||
| Various Shapes | Polygon Columns | ||
| Cube | Triangular Prism | Triangular | |
| Box | Paraboloid | Quadrilateral | |
| Cone | Polygon based Pyramid | Pentagon | |
| Cone Frustum | Pyramid Frustum | Hexagon | |
| Cylinder | Sphere | Heptagon | |
| Slanted Cylinder | Sphere Cap | Octagon | |
| Ellipsoid | Oblate Spheroid | Nonagon | |
| Torus | Capsule | Decagon | |