Area Calculator
Area of any shape.
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Geometry
Surface Area Calculator
Find the surface area of a box, sphere, cylinder or cone.
Surface area
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Square units.
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Show our math
Enter your figures above to see the step-by-step working.
Everything computed client-sideEverything computed client-side — nothing leaves this page
How the Surface Area Calculator Works
Surface area is the total area of all the outer faces of a solid, in square units — what you’d need to paint, wrap or coat it. Choose a solid and the calculator uses the right formula: box 2(ab+ah+bh), cube 6a², sphere 4πr², cylinder 2πr(r+h) and cone πr(r+slant).
It’s useful for painting, packaging, heat-loss and material estimates. Keep measurements in the same unit for a result in that unit squared.
surface area depends on solid — e.g. sphere = 4πr², cube = 6a²
Frequently Asked Questions
What is surface area?
The combined area of every outer face of a 3D solid, measured in square units. It’s what you’d cover to paint or wrap the object.
How do you find the surface area of a cylinder?
Add the two circular ends and the side: 2πr(r+h), where r is the radius and h the height.
What is the difference between surface area and volume?
Surface area is the outside (square units); volume is the space inside (cubic units).
More From The Desk
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Volume of any solid.
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Circle area & circumference.
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Area from radius.
Open →Triangle Area Calculator
Triangle area.
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