Rectangle Calculator
How do I find the area of a rectangle?
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator takes a rectangle's width and height and computes its area (width × height), perimeter (2 × (width + height)), and diagonal length using the Pythagorean theorem (√(width² + height²)) — the three measurements most commonly needed for a rectangular shape.
It's used for practical, everyday sizing problems: figuring out how much flooring, paint, fencing or fabric is needed for a rectangular room or plot, checking whether a piece of furniture or a TV will fit through a doorway using the diagonal, and by students working through geometry homework that asks for area, perimeter and diagonal together.
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