Square Inches of a Circle Calculator

How the calculation works

Area = π × radius in inches squared.

Worked example

With radius 3 in, area is 28.27433388 in².

Assumptions and limits

Enter the radius in inches. The source explains that a radius supplied in another unit must first be converted to inches, then applies area = π × radius². A zero radius returns zero area. The upper input bound keeps the result below 1e15 in².