Surface Area Calculator
Compute the surface area of cubes and rectangular prisms
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Total surface area—
Formula used—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- Cube, side length 5 → Surface area = 150; volume = 125
- Sphere, radius 7 → Surface area ≈ 615.75 (4πr²)
Formula
Cube: A = 6s². Rectangular prism: A = 2(lw + lh + wh). Surface area sums the area of all 6 faces. Volume is included for convenience.
About Surface Area Calculator
Compute the surface area of cubes and rectangular prisms. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.