Moment of Inertia / lb·ft² → lb·in²
Convert Pound square feet to Pound square inches
Convert mass moments of inertia used in rotational dynamics. Convert Pound square feet (lb·ft²) to Pound square inches (lb·in²). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Pound square inches to Pound square feet →
How to convert pound square feet to pound square inches
These units describe mass moment of inertia (mass times distance squared). Second moment of area uses length to the fourth power and belongs to a different quantity.
Use x for the value in lb·ft², b for the intermediate value in kg·m², and y for the result in lb·in².
lb·in² = lb·ft² × 0.042140110093804806 ÷ 0.0002926396534292
Worked examples
10 lb·ft² ≈ 1440 lb·in²
Step 1: (10 × 0.0421401100938) ≈ 0.421401100938 kg·m².
Step 2: 0.421401100938 ÷ 0.000292639653429 ≈ 1440 lb·in².20 lb·ft² ≈ 2880 lb·in²
Step 1: (20 × 0.0421401100938) ≈ 0.842802201876 kg·m².
Step 2: 0.842802201876 ÷ 0.000292639653429 ≈ 2880 lb·in².
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Pound square feet
Pound square feet (lb·ft²) measures moment of inertia under the conventions above. The base value in kg·m² is (x × 0.0421401100938), where x is the numerical value in lb·ft². Factors shown here are rounded for display; calculations use the stored factor.
About Pound square inches
Pound square inches (lb·in²) measures moment of inertia under the conventions above. The base value in kg·m² is (x × 0.000292639653429), where x is the numerical value in lb·in². Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Pound square feet to pound square inches reference table
| Pound square feet (lb·ft²) | Pound square inches (lb·in²) |
|---|---|
| 1 | 144 |
| 5 | 720 |
| 10 | 1440 |
| 25 | 3600 |
| 50 | 7200 |
| 100 | 14400 |
| 1000 | 144000 |
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