Annulus Calculation
Online calculator and formulas for calculating an annulus
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.
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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
\(\displaystyle i = 2 · \sqrt{R^2 - r^2}\)
Angle functions
From Deg, Min, Sec to Decimal • From Degree to Percent • Angle sum • Side lengths from anglesCircular functions
Annulus • Annulus sector • Circle • Circular angles • Circular arcs • Circular sector • Circular segment • Ellipse • Parabolic arch • Squaring the Circle
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