Surface Area Calculator

Solid

Side length (s)

Length (l)

Width (w)

Height (h)

Radius (r)

Base edge (a)

Surface area —

Volume —

How to Find the Surface Area of a Solid

Choose the shape, type its measurements, and read the surface area.

Choose the solid

Select a cube, box, sphere, cylinder, cone or pyramid. Only the measurements that shape needs are shown.

Enter the dimensions

Type the radius, height, side or edge lengths in the same unit. Surface area comes out in that unit squared.

Read surface area and volume

The total surface area is shown first, with the volume alongside and the formula in the steps.

Frequently Asked Questions

What is the surface area of a cylinder?

A closed cylinder has surface area 2πr² + 2πrh, which is the two circular ends plus the curved side. With r = 3 and h = 5 that is 2π(9) + 2π(15) = 48π, about 150.80. An open tube or a tank with no lid drops one or both of the πr² end caps. Enter the radius and the height and the calculator applies the closed-cylinder formula and shows each part.

How do I find the surface area of a cone?

The surface area of a closed cone is πr² + πr·l, where l is the slant height, l = √(r² + h²). For r = 3 and h = 4 the slant height is 5, so the area is 9π + 15π = 24π, about 75.40. The πr² term is the circular base and πr·l is the curved lateral surface. Select Cone and enter the radius and the height; the slant height is worked out for you.

What units does surface area come out in?

Surface area comes out in the unit you entered the dimensions in, squared. Centimetres in gives square centimetres (cm²), and metres in gives square metres (m²). The calculator is unit-agnostic, so mixing units within one shape gives a meaningless answer and you should convert everything first. Remember that scaling every length by a factor k multiplies the surface area by k².

Is my data sent anywhere?

Nothing you type is sent anywhere. The surface area calculator runs entirely in your browser with JavaScript, so your dimensions never leave your device. There is no account, no upload step and nothing is logged. The page keeps working offline once it has loaded.

How to Find the Surface Area of a Solid

Choose the solid

Enter the dimensions

Read surface area and volume

Frequently Asked Questions

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