Moment of Inertia / lb·in² → lb·ft²
Convert Pound square inches to Pound square feet
Convert mass moments of inertia used in rotational dynamics. Convert Pound square inches (lb·in²) to Pound square feet (lb·ft²). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Pound square feet to Pound square inches →
How to convert pound square inches to pound square feet
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·in², b for the intermediate value in kg·m², and y for the result in lb·ft².
lb·ft² = lb·in² × 0.0002926396534292 ÷ 0.042140110093804806
Worked examples
10 lb·in² ≈ 0.0694444444444 lb·ft²
Step 1: (10 × 0.000292639653429) ≈ 0.00292639653429 kg·m².
Step 2: 0.00292639653429 ÷ 0.0421401100938 ≈ 0.0694444444444 lb·ft².20 lb·in² ≈ 0.138888888889 lb·ft²
Step 1: (20 × 0.000292639653429) ≈ 0.00585279306858 kg·m².
Step 2: 0.00585279306858 ÷ 0.0421401100938 ≈ 0.138888888889 lb·ft².
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 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.
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.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Pound square inches to pound square feet reference table
| Pound square inches (lb·in²) | Pound square feet (lb·ft²) |
|---|---|
| 1 | 0.00694444444444 |
| 5 | 0.0347222222222 |
| 10 | 0.0694444444444 |
| 25 | 0.173611111111 |
| 50 | 0.347222222222 |
| 100 | 0.694444444444 |
| 1000 | 6.94444444444 |
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