Spike's Calculators

Its like magic to change a circle into a square, click the button and poof there you have it!!

This calculator converts the area of a circle into a square with four even length sides and four right angles. The calculation is based on the area of the square being the same as the circle's area.

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

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

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

Area = length * length

side length = √ (A)where A = the area of the circle

perimeter = length * 4

- enter the diameter of a circle
- number of decimal places required in results

- radius of the circle
- the area of the circle
- the perimeter of the circle (circumference)
- side of the square's length
- perimeter of the square