Annulus Calculation

Calculator and formulas for calculating an annulus

Annulus Calculator


With the annulus calculator on this page, various parameters of an annulus can be calculated. The formulas for the annulus calculation can be found at the bottom of this page.

To perform the calculation, enter the two radii and then click the 'Calculate' button.


Annulus calculator

 Input
Large radius R
Small radius r
Decimal places
 Results
Area A
Perimeter P
Breadth b
Interval i
Keisring

Formulas for calculating an annulus

Area \(\displaystyle A = π · (R^2-r^2)\)
Perimeter \(\displaystyle P = 2 · π · (R+r )\)
Breadth \(\displaystyle b = R-r\)
Interval \(\displaystyle i = 2 · \sqrt{R^2 - r^2}\)


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