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Kordu Tools

Area & Perimeter Calculator

Calculate area and perimeter for rectangles, squares, triangles, parallelograms, trapezoids, ellipses, and regular polygons.

l = ?w = ?

Rectangle Dimensions

Results

Area

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Perimeter

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Enter the required dimensions above to see results.

All Formulae

Rectangle A = l×w, P = 2(l+w)

Square A = s², P = 4s

Triangle A = bh/2, P = a+b+c

Parallelogram A = bh, P = 2(b+s)

Trapezoid A = (a+b)h/2, P = a+b+leg&sub1;+leg&sub2;

Rhombus A = d&sub1;×d&sub2;/2, P = 4×√((d&sub1;/2)²+(d&sub2;/2)²)

Ellipse A = πab, P ≈ π(3(a+b) − √((3a+b)(a+3b)))

Regular Polygon A = ns²/(4tan(π/n)), P = ns

How to use

  1. 1

    Select a shape

    Choose from rectangle, square, triangle, parallelogram, trapezoid, rhombus, ellipse, or regular polygon.

  2. 2

    Enter dimensions

    Fill in the required measurements for your selected shape.

  3. 3

    View results

    Area and perimeter are calculated instantly with the formula shown.

Frequently asked questions

What shapes are supported?
Rectangle, square, triangle, parallelogram, trapezoid, rhombus, ellipse, and regular polygons with 3-12 sides.
What is a regular polygon?
A polygon where all sides and angles are equal. Enter the number of sides and the side length.
Is my data sent anywhere?
No. All calculations run in your browser.

Select a 2D shape and enter its dimensions to instantly calculate

area and perimeter. Supports rectangle, square, triangle,

parallelogram, trapezoid, rhombus, ellipse, and regular polygons

(3-12 sides). Each shape shows its formula and an SVG diagram with

labelled dimensions. All processing runs in your browser.

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