KALKSY

Rectangle Calculator

Calculate the area and perimeter of a rectangle for rooms, furniture, and design calculations.

Enter length and width:

Perimeter

16

Area

15

Rectangle Calculations ▭

Calculate area and perimeter using length and width.

Key Facts

  • Length and width must be measured accurately.

Formulas

  • Area
    Area = l × w - l = length, w = width. Area represents the surface inside the rectangle.
  • Perimeter
    Perimeter = 2 × (l + w) - Sum of all sides of the rectangle.

Applications 📐

  • Room area for flooring or painting.
  • Perimeter for framing or molding.
  • Furniture placement in rectangular spaces.

FAQs

What if length equals width?

Then the rectangle is a square and square formulas apply.