1. Convert to base units
kg m2 = input value x input unit factor
Every supported mass moment of inertia unit is stored as a factor relative to kilogram square meters.
Mechanical unit converter
Moment of Inertia Unit Converter
Convert mass moment of inertia units for rotating bodies, shafts, flywheels, dynamics, and mechanical design calculations.
Live moment of inertia conversion
Convert moment of inertia units
Enter a value, choose the starting unit, and select a target unit. The full moment of inertia conversion table updates automatically.
Converted value
All units
Moment of Inertia conversion table
Compare the entered value across SI, metric sub-units, and imperial rotational inertia units.
Common conversions
Useful moment of inertia conversion factors
| Conversion | Factor | Typical use |
|---|---|---|
| kg m2 to lb ft2 | lb ft2 = kg m2 x 23.73036 | Imperial rotating systems |
| lb ft2 to kg m2 | kg m2 = lb ft2 x 0.04214011 | SI dynamics |
| slug ft2 to kg m2 | kg m2 = slug ft2 x 1.35581795 | US engineering dynamics |
| kg cm2 to kg m2 | kg m2 = kg cm2 x 0.0001 | Small rotating parts |
| g cm2 to kg m2 | kg m2 = g cm2 x 1e-7 | Precision components |
| lb in2 to kg m2 | kg m2 = lb in2 x 0.00029264 | Small imperial components |
How it works
Moment of Inertia conversion method
2. Convert to target units
target value = base value / target unit factor
The selected result and table values are calculated from the same base value.
3. Check precision
rounding depends on scale
Very small and very large values use compact scientific notation to stay readable.
FAQ
Moment of Inertia converter questions
How do you convert kg m2 to lb ft2?
Divide kg m2 by 0.04214011, or multiply by about 23.73036, to convert to lb ft2.
How do you convert lb ft2 to kg m2?
Multiply lb ft2 by 0.04214011 to convert to kg m2.
Is this area moment or mass moment of inertia?
This page converts mass moment of inertia units used in rotational dynamics, not second moment of area.
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