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Area Calculator

Calculate area of different geometric shapes

Last Updated: July 2026
Select shape
First dimension
Second dimension (if applicable)
Third dimension (for trapezoid)
Area
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Square units
Perimeter
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Total boundary
Formula Used
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Calculation method

Area Calculation

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What Is an Area Calculator?

An Area Calculator computes the area and perimeter of various geometric shapes: rectangle, square, circle, triangle, and trapezoid. It shows the formula used and provides results in multiple units.

This calculator is useful for construction planning, interior design, land measurement, mathematics problems, and any scenario requiring area calculations.

Area Formulas

Rectangle: Length × Width
Square: Side²
Circle: π × Radius²
Triangle: ½ × Base × Height
Trapezoid: ½ × (a + b) × Height
Rectangle = L × WSquare = S²Circle = πr²Triangle = ½bh

Frequently Asked Questions

How to calculate area of different shapes?
Rectangle: Length × Width. Square: Side². Circle: π × Radius². Triangle: ½ × Base × Height. Trapezoid: ½ × (Sum of parallel sides) × Height.
What are common area units?
Square meters (m²), square feet (ft²), square yards (yd²), acres, hectares. 1 m² = 10.764 ft². 1 acre = 4,047 m². 1 hectare = 10,000 m².
How to convert between area units?
Multiply by conversion factor. For example, m² to ft²: multiply by 10.764. Acres to m²: multiply by 4,047. Use unit converter for quick conversions.
What is the area of a circle?
Area = π × r², where r is radius. For radius 5m: Area = 3.14159 × 5² = 78.54 m². Alternatively, Area = π × d²/4, where d is diameter.
How to calculate area of irregular shapes?
Divide into regular shapes (rectangles, triangles), calculate each area, and sum them. Alternatively, use coordinate geometry or integration for complex shapes.

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