Surface area calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Volume = πr²h; surface = 2πr(r + h).
- Volume = 282.743339 and surface area = 245.044227.
| Inputs | Answer |
|---|---|
| Shape: Rectangular box (a, b, c = length, width, height); a: 2; b: 3; c: 4 | The rectangular box has volume 24 cubic units and surface area 52 square units. |
| Shape: Cylinder (a = radius, b = height); a: 3; b: 10; c: 1 | The cylinder has volume 282.743339 cubic units and surface area 245.044227 square units. |
| Shape: Sphere (a = radius); a: 5; b: 1; c: 1 | The sphere has volume 523.598776 cubic units and surface area 314.159265 square units. |
| Shape: Cube (a = edge); a: 4; b: 1; c: 1 | The cube has volume 64 cubic units and surface area 96 square units. |
How to use it
Surface area is the total area of the outside of a solid. Cube 6a², box 2(ab + ac + bc), cylinder 2πr(r + h), sphere 4πr², cone πr(r + slant height), square pyramid base + four triangles, hemisphere 3πr² including the flat base.
The volume is shown alongside. Surface area is in square units, volume in cubic units.
Frequently asked questions
What is the surface area of a 2 by 3 by 4 box?
2 × (6 + 8 + 12) = 52 square units.
What is the surface area of a sphere?
4πr².
Does the cylinder formula include the ends?
Yes, 2πr(r + h) covers the curved side and both circular ends.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.