Polar Moment of Inertia of a Circle formulas |
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\(J_{z} \;=\; \dfrac{ \pi \cdot r^4 }{ 2 } \) \( J_{z1} \;=\; \dfrac{ 5 \cdot \pi \cdot r^4 }{ 2 } \) |
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| Symbol | English | Metric |
| \( J \) = torsional constant | \( in^4 \) | \( mm^4 \) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | \(3.141 592 653 ...\) |
| \( r \) = radius | \( in \) | \( mm \) |
Polar moment of inertia of a circular cross-section with radius or diameter is a measure of its resistance to torsional deformation.
