Spike's Calculators

Convert the area of a circle into an rectangle shaped area of the same size. Works much the same way as a circle to square conversion but you will have to enter the width of the rectangle in addition to the circle's diameter.

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

A = length * width

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

P = length * 2 + width * 2

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

- radius of the circle
- the area of the circle
- the perimeter of the circle (circumference)
- the length of the rectangle
- perimeter of the rectangle