Calculate area and perimeter for various geometric shapes including rectangles, circles, triangles, and polygons.
Loading calculator...
Embed this area & perimeter calculator on your website for free. It's responsive, always up-to-date, and easy to customize.
A quadrilateral with four right angles
A = length × widthP = 2(length + width)Pick a shape, enter dimensions, and get both area and perimeter with formulas clearly shown.
Choose the geometry you need.
Provide required measurements in consistent units.
See results and optional steps.
Space inside the boundary (e.g., paint, flooring).
Total boundary length (e.g., fencing, trim).
Compute area and perimeter for rectangles, squares, circles, triangles (right, equilateral, Heron), trapezoids, parallelograms, rhombus, regular polygons, ellipse, sectors, and annulus. Includes unit selection, step-by-step formulas, and additional derived values like circumference, semi-perimeter, hypotenuse, arc length, and more.
All common plane shapes including ellipse and regular n-gon.
Optional step-by-step breakdown of formulas used.
Choose mm, cm, m, in, or ft; outputs labeled accordingly.
Area and perimeter calculator for many shapes, triangle area, circle circumference, ellipse area, sector area, annulus area, regular polygon area, Heron formula, right triangle, unit converter geometry.
Need more math utilities? Try our Scientific Calculator and Sequence & Series Calculator.
Important: Educational tool; verify measurements and add practical allowances for real-world tasks.