Spike's Calculators

Area and Perimeter

Changing a Circle to a Rectangle

Convert the area of a circle into a rectangle-shaped area of the same size(the rectangle results have the same area as the circle). You must enter the rectangle's width and the circle's diameter.

Circle to a Rectangle

Select unit:
diameter of the circle {{selectedunit.m1}}
width of rectangle {{selectedunit.m1}}
decimal places #


circle's radius {{selectedunit.m1}}
area of the circle {{selectedunit.m1}}²
circumference of the circle {{selectedunit.m1}}
length of rectangle {{selectedunit.m1}}
perimeter of the rectangle {{selectedunit.m1}}


  1. enter the diameter of a circle
  2. the width of the rectangle
  3. decimal precision, the number of digits after the decimal point


  1. radius of the circle
  2. the area of the circle
  3. the perimeter of the circle (circumference)
  4. the length of the rectangle
  5. perimeter of the rectangle

Circle Formula's

R = D ÷ 2
where R = radius, D = diameter

A = π * D² ÷ 4
where A = area, π = 3.14159..., D = diameter

C = 2 * π * D ÷ 2
where C = circumference, π = 3.14159...., D = diameter

Rectangle Formula's

A = length * width

L = A ÷ W
where L= length, A = area, W = width

P = length * 2 + width * 2
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