Rectangle Area Calculator
Calculate a rectangle's area and perimeter from its length and width.
01 / INPUTS
m
m
02 / RESULT
AREA
12 m²
- Area
- 12 m²
- Perimeter
- 14 m
Calculation trace
- 4 m × 3 m = 12 m²12 m²Area
- 2 × (4 m + 3 m) = 14 m14 mPerimeter
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SOURCES
- Bureau International des Poids et Mesures (BIPM)The International System of Units (SI), 9th edition ↗
SI unit of area (square metre); rectangle area A = length × width
Accessed 2026-08-19