ONE FORMULA, ONE ANSWER
Circular Tube Area Moment Calculator
Calculate the second moment of area of a circular tube about a centroidal diameter. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Centroidal diametral area moment I
Enter values and select Calculate.
I = π(D⁴−d⁴)/64
Assumptions
Required: D>0 and 0≤d<D for a concentric circular tube about a centroidal diameter. This is an area moment, not a mass moment or a polar area moment. Eccentricity and thickness tolerances are excluded.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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