Do I need to sign up?

No. The tool works without an account.

Are my data uploaded?

Compatible operations run locally in the browser.

Surface area = 4 × π × r². Radius must be non-negative.

Any consistent length unit. Result in square units.

Calculate the surface area of a sphere from its radius. Formula: A = 4 π r².

Sphere surface area

314.1593

Radius (r)

Formula: A = 4 π r²

Examples

r = 5 → ~314.1593

r = 3 → ~113.0973

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Tool guide

Practical information to understand the result and use this tool correctly.

Calculate the surface area of a sphere from its radius. Formula: A = 4 π r².

The tool runs directly in the browser for immediate results.

Do I need to sign up?: No. The tool works without an account.
Are my data uploaded?: Compatible operations run locally in the browser.
What is the formula?: Surface area = 4 × π × r². Radius must be non-negative.
Units?: Any consistent length unit. Result in square units.