Calculate area and perimeter of squares, rectangles, circles, triangles, trapezoids and more.
What is the Area & Perimeter Calculator?
Pick a shape – square, rectangle, circle, triangle, trapezoid, parallelogram or ellipse – enter its sizes and get the area and perimeter (or circumference) instantly. Use any unit: the answer is in the same unit, squared for area.
How to use the Area & Perimeter Calculator
- Choose the shape.
- Enter the sizes shown.
- Read the area and perimeter.
Frequently asked questions
How do I find the area of a triangle with 3 sides?
This tool uses Heron’s formula: s = (a+b+c)/2, area = √(s(s−a)(s−b)(s−c)).
This area & perimeter calculator is 100% free, needs no signup and runs in your browser, so your data stays private.
Last updated: · By NodifyTech