Instantly compute the area, circumferences, and width of any circular ring online.
Width (w) • Outer Circ. (U₁) • Inner Circ. (U₂)
Ring Area (A)
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Step 01
Input the outer radius (R) of the circular ring.
Step 02
Input the inner radius (r) of the circular cutout.
Step 03
Instantly get the exact ring area, outer/inner circumferences, and width.
Step 04
Expand the details to review the mathematical formula breakdown.
| Property | Formula | Description |
|---|---|---|
| Ring Area (A) | A = π · (R² - r²) | Area between the two concentric circles. |
| Ring Width (w) | w = R - r | Radial thickness of the ring. |
| Outer Circ. (U₁) | U₁ = 2 · π · R | Circumference of the outer circle. |
The outer radius (R) must always be greater than the inner radius (r).
Keep measurement units consistent for both radii.
Great for pipe cross-sections, washers, gaskets, and ring layouts.
Legal Disclaimer: Calculators serve as educational reference guides.
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