Rectangle Calculator

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l =   
w =   
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a = 
p = 

Rectangle Geometric Shape

Rectangle Diagram with l = length and w = width
l = length
w = width
a = area
p = perimeter

Rectangle Formulas:

If you know any 2 values for the rectangle (length, width, area or perimeter) you can calculate the other 2 rectangle unknowns. A square calculation is a special case of the rectangle where the length is equal to the width.

Area of a rectangle:

a = l * w

Perimeter of a rectangle:

p = 2l + 2w

Rectangle Calculations

  • Given the length and width find the area and perimeter
    l and w are known; find a and p
    • a = l * w
    • p = 2l + 2w
  • Given the area and length find the width and perimeter
    a and l are known; find w and p
    • w = a/l
    • p = 2l + 2w
  • Given the perimeter and length find the width and area
    p and l are known; find w and a
    • w = p/2 - l
    • a = l * w
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