Hemisphere Surface Area Calculator

Closed hemisphere (including base):

Where r is the radius.

Open hemisphere (excluding base):

Calculate the surface area of a closed hemisphere with radius 9 cm:

Result: 763.41 cm²

1. Enter the radius of the hemisphere
2. Select whether to include the base
3. Click "Calculate" to see the surface area

• Volume: $\\\\frac{2}{3}\\\\pi r^3$
• Base area: $\\\\pi r^2$
• Curved surface area: $2\\\\pi r^2$

• Dome and hemisphere calculations
• Bowl and cup design
• Architectural domes
• Sports balls

What if I only know the diameter? Divide by 2 to get the radius.

How is this different from a sphere? A sphere is $4\\\\pi r^2$; a hemisphere is half that plus the base (or just half if open).

What about an open hemisphere? Use $2\\\\pi r^2$ instead of $3\\\\pi r^2$.

Can I calculate from volume? Yes: $r = \\\\sqrt[3]{\\\\frac{3V}{2\\\\pi}}$, then use $3\\\\pi r^2$.