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Geometry

Sphere Surface Area Calculator

Find the total outside surface of a sphere.

Let’s calculate.

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Your result
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Rounded to up to 2 decimal places.

Measurement units

Changing the input unit also selects its matching result unit. Choose another result unit to convert the answer. Input numbers stay unchanged.

SI prefixes and selected international / customary units. Coverage: SI and selected current customary units. Historical units are excluded.

See what you’re calculating

r
Surface area = 4 × π × radius²

Find the total outside surface of a sphere.

Illustration not to scale.

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THE IDEA, SIMPLY

How it works

Find the total outside surface of a sphere.

FORMULA

Surface area = 4 × π × radius²

A worked example

Radius 3 m gives 36π ≈ 113.0973 m².

Formula & detailed explanation

Radius nonnegative. This calculates area, not enclosed volume.

Calculations use decimal arithmetic with 40 significant digits internally. Choose 0–8 decimal places for the displayed result. Trailing zeros are omitted. Rounding affects only the displayed and copied result; very small values may round to zero. Accepted inputs have up to 100 characters and magnitudes from 10⁻¹⁰⁰ to 10¹⁰⁰, plus zero.

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