Spike's Calculators

This calculator converts a circle into an oval area of the same size *(the oval results have the same area as the circle)*.

- enter the diameter of a circle
- the length of the short axis of the oval
- decimal precision, the number of digits after the decimal point

- radius of the circle
- the area of the circle
- the perimeter of the circle (circumference)
- the long axis length of the oval
- perimeter of the oval

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 = π * la * sa ; ÷ 4

La = (A / (π * (Sa ÷ 2)) * 2where La = long axis, A = area, π = 3.14159...., Sa = short axis

S = Sa ÷ 2 , L = La ÷ 2where P = perimeter, La = long axis, π = 3.14159...., Sa = short axis

Pa = (S + L) * 3

Pb = ((3 * L + S) * (L + 3 * S))²

P = π * (Pa - Pb)