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For a circle, sphere and cylinder calculator click here.
For a right circular cone calculator click here.

Circle Formulas

Circumference   =   2 • π • radius   =   π • diameter

Circle Area   =       π • r²     =     ¼ • π • d²

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Sphere Formulas

Sphere Surface Area     =     4 • π • r²     =     π • d²

Sphere Volume   =   4/3 • π • r³     =     ( π •d³)/6




Click here or here for partially-filled sphere calculators.


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Cylinder Formulas

Surface Area = (2 • π • r²) + (2 • π • r • height)
Where (2 • π • r²) is the surface area of the "ends" and (2 • π • r • height) is the lateral area (the area of the "side").


Volume   =   π • r² • height   =   ¼ • π • d² • height

If you need a cylinder calculator click here.


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Cone Formulas


Surface Area   =   π • r • slant height     +     π • r²
Where (π • r • slant height) is the lateral area and (π • r²) is the base area
Volume   =   ( π • r² • height ) ÷ 3

If you need a right circular cone calculator, please click here



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