`A = 3*pi*r^2`

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The Surface Area of a Hemisphere calculator computes the surface area (A) of a hemisphere based on the radius.   A Hemisphere   This includes the circular base.

INSTRUCTIONS: Choose units and enter the following:

• (r)  This is the radius of the sphere.

Hemisphere Surface Area (A): The calculator returns the surface area of the hemisphere (A) in square meters (m²).  However, this can be automatically converted to other area units units via the pull-down menu.

The Math / Science

The equation for the surface area of hemisphere is the addition of two formulas:

1. Surface area of a sphere:   A = 4 • π • r², and 
2. Area of a circle for the flat base:       A = π • r²

Since it is a hemisphere, the area of the spherical portion is half of the surface area of a sphere:  A = 1/2  • 4 • π • r², which simplifies to  A =2 • π • r².

Adding the two together:   A = 2 • π • r² +  π • r², the formula for the surface area of a hemisphere is:   

A = 3 • π • r²

Where:

• A = Surface Area of Hemisphere
• r = Radius of the hemisphere

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A hemisphere is half of a sphere. The boundary is a great circle that goes through the center of the sphere.

Hemisphere Calculators

• Volume of a Hemisphere
• Surface Area of a Hemisphere
• Mass or Weight of a Hemisphere