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Area Calculator

Calculate the area of any shape — rectangle, circle, triangle, trapezoid, ellipse, and more. Get results in multiple units instantly with a visual preview.

Select Shape & Enter Dimensions

Choose a shape then fill in the required measurements

Shape Type
Dimensions
Unit of Measurement

Shape Preview

Area
--
--
select a shape
Perimeter
--
boundary length
In Square Meters
-- m²
SI base unit
In Acres
-- ac
land measurement

Shape Formulas

RectangleL × W
Circleπ × r²
Triangle½ × b × h
Trapezoid½(a+b) × h
Ellipseπ × a × b
Parallelogramb × h

Common Reference Areas

Football field57,600 ft²
Tennis court2,808 ft²
NBA court4,700 ft²
1 Acre43,560 ft²

Area Formula Quick Reference

Sector

½ × r² × θ (radians)

Rhombus

½ × d₁ × d₂

Square

s²

Ellipse

π × semi-major × semi-minor