Area Calculator

This online Area Calculator can calculate the area of any geometrical shape easily and accurately. Following calculators are included in this tool: Online Area Calculator, Rectangle Area Calculator, Circle Area Calculator, Area of a circle, Triangle Area Calculator, Square Area Calculator, Parallelogram Area Calculator, Trapezoid Area Calculator, Pentagon Area Calculator, Hexagon Area Calculator, Octagon Area Calculator, Ellipse Area Calculator, Sector Area Calculator, Semicircle Area Calculator etc.


    Area Calculator
        
    
        Select Shape:
        
    
    
    
    
        Length:
        
        Width:
        
    
    
    
        Radius:
        
    
    
    
        Base:
        
        Height:
        
    
    
    
        Side:
        
    
    
    
        Base:
        
        Height:
        
    
    
    
        Base 1:
        
        Base 2:
        
        Height:
        
    
    
    
        Side:
        
    
    
    
        Side:
        
    
    
    
        Side:
        
    
    
    
        Major Axis:
        
        Minor Axis:
        
    
    
    
        Radius:
        
        Angle (degrees):
        
    
    
    
        Radius:
        
    
    
    
    
    
        Area:
        0.00

How to Use the Area Calculator:

Select Shape: Choose the shape you want to calculate the area for (e.g., rectangle, circle, triangle, square, parallelogram, trapezoid, pentagon, hexagon, octagon, ellipse, sector, semicircle).
Enter Dimensions: Input the required dimensions (e.g., length, width, radius, base, height, side, major axis, minor axis, angle).
Calculate Area: Click the “Calculate Area” button to get the result instantly.
View Result: The area will be displayed in a distinct green box.

Supported Shapes and Formulas:

Rectangle: Length × Width
Circle: π × Radius²
Triangle: (Base × Height) / 2
Square: Side²
Parallelogram: Base × Height
Trapezoid: ((Base1 + Base2) / 2) × Height
Pentagon: (5/4) × Side² × (1 / tan(π/5))
Hexagon: (3√3 / 2) × Side²
Octagon: 2 × (1 + √2) × Side²
Ellipse: π × Major Axis × Minor Axis
Sector: (Angle / 360) × π × Radius²
Semicircle: (π × Radius²) / 2

Area calc

What is Area – Simple Explanation

Area measures how much space a flat, two-dimensional shape covers. Imagine painting a surface – the amount of paint needed represents its area. Area is measured in square units, with the square meter (m²) being the standard SI unit.

Below are the most common shapes and how to calculate their areas.

Rectangle (and Square)

A rectangle has four right angles. Its area depends on its length and width.

Formula:
Area = length × width

If both sides are equal, the shape is a square.

Triangle

The area of a triangle depends on its sides or height. A widely used method is Heron’s Formula, useful when all three sides are known.

Formula:
Area = √[s(s − a)(s − b)(s − c)]
where s = (a + b + c) / 2

Trapezoid

A trapezoid has one pair of parallel sides called bases.

Formula:
Area = (b₁ + b₂) / 2 × h
where h is the perpendicular distance between the bases.

Circle

A circle is defined by its radius—the distance from the center to the edge.

Formula:
Area = πr²

Sector (Part of a Circle)

A sector is a slice of a circle defined by an angle.

Formula (degrees):
Area = (θ / 360) × πr²

Ellipse

An ellipse is a stretched circle with two radii.

Formula:
Area = πab
where a and b are the semi-major and semi-minor axes.

Parallelogram

A parallelogram has opposite sides parallel and equal.

Formula:
Area = base × height

(Rectangles, squares, and rhombuses are special cases.)

Common Area Units

Unit	Area in m²
Square meter	1
Hectare	10,000
Square kilometer	1,000,000
Square foot	0.0929
Square yard	0.8361
Acre	4,046.9
Square mile	2,589,988

Conclusion

Knowledge about area helps in everyday decisions – from buying land to planning rooms or estimating materials. With just a few simple formulas, you can calculate the space covered by almost any shape with confidence and accuracy.