Area Moment of Inertia Converter
Convert second moments of area between m⁴, cm⁴, mm⁴, in⁴ and ft⁴.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Raise the length conversion factor to the fourth power for the same second moment of area.
1 in⁴=(25.4 mm)⁴=416231.4256 mm⁴
Worked example
1 in⁴ equals 416231.4256 mm⁴, or 41.62314256 cm⁴.
Assumptions and input details
The input is an already known second moment of area about a stated axis. It is not ordinary area, mass moment of inertia or section modulus. No axis translation, cross-section geometry, bending stress, beam deflection or structural capacity is calculated.
References: NIST: unit conversion factors
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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