# Surface Area Calculator

> Surface area calculator for cubes, spheres, cylinders, cones, and more. Shows the formula for each shape and runs entirely in your browser with no signup.

- **Canonical URL:** https://boringtoolskit.com/surface-area-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** August 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Cube: 6a². Sphere: 4πr². Cylinder: 2πr² + 2πrh. Cone: πr² + πrs. Box: 2(lw+lh+wh).

## Sources

- [Calculation methodology and verification standard](/methodology/)

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