Annulus (Ring) Calculator
Find the area of a ring (annulus) between two circles, its width and both circumferences.
Area
50.26548246
- Width
- 2
- Outer circumference
- 31.41592654
- Inner circumference
- 18.84955592
Show the work
Difference of the squared radii
R to the power of 2 − r to the power of 2
5 to the power of 2 − 3 to the power of 2 = 16
Area
A = π(R to the power of 2 − r to the power of 2)
π × 16 = 50.26548246
How it works
Area = π(R² − r²); width = R − r
Questions
- How does the annulus (ring) calculator work?
- Area = π(R² − r²); width = R − r.
- What do I need to enter?
- Outer radius (R), Inner radius (r), Units. Optional fields can be left blank.
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