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Geometry

Rectangle Area Calculator

Multiply the two perpendicular side lengths.

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

hbase / width
Area = width × height

Multiply the two perpendicular side lengths.

Illustration not to scale.

No account needed. Your inputs stay in this browser.

THE IDEA, SIMPLY

How it works

Multiply the two perpendicular side lengths.

FORMULA

Area = width × height

A worked example

5 m × 3 m = 15 m².

Formula & detailed explanation

Both side lengths must be nonnegative and share the input unit.

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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