Pound square inch (lb·in²)
One avoirdupois pound at one inch: 0.45359237 × 0.0254² kg·m².
What is a pound square inch?
- Symbol
- lb·in²
- Quantity
- Moment of Inertia
- Unit system
- US customary
- Definition
- One avoirdupois pound at one inch: 0.45359237 × 0.0254² kg·m².
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used in US machine design and motor data for smaller rotating parts.
Pound square inch in other moment of inertia units
- 1 lb·in² = 0.0002926396534292 kg·m²Kilogram square meter
- 1 lb·in² = 2.926396534292 kg·cm²Kilogram square centimeter
- 1 lb·in² = 2926.396534292 g·cm²Gram square centimeter
- 1 lb·in² ≈ 0.006944444444 lb·ft²Pound square foot
- 1 lb·in² = 16 oz·in²Ounce square inch
- 1 lb·in² ≈ 0.0002158399317 slug·ft²Slug square foot
Pound square inch quick reference
| Pound square inch | Kilogram square meter | Pound square foot | Kilogram square centimeter |
|---|---|---|---|
| 1 lb·in² | = 0.0002926396534292 kg·m² | ≈ 0.006944444444 lb·ft² | = 2.926396534292 kg·cm² |
| 10 lb·in² | = 0.002926396534292 kg·m² | ≈ 0.06944444444 lb·ft² | = 29.26396534292 kg·cm² |
| 100 lb·in² | = 0.02926396534292 kg·m² | ≈ 0.6944444444 lb·ft² | = 292.6396534292 kg·cm² |
| 1000 lb·in² | = 0.2926396534292 kg·m² | ≈ 6.944444444 lb·ft² | = 2926.396534292 kg·cm² |
Where the pound square inch fits
The next smaller moment of inertia unit is the kilogram square centimeter (kg·cm²). 1 lb·in² = 2.926396534292 kg·cm², and 1 kg·cm² ≈ 0.3417171898 lb·in².
The next larger moment of inertia unit is the pound square foot (lb·ft²). 1 lb·in² ≈ 0.006944444444 lb·ft², and 1 lb·ft² = 144 lb·in².
Frequently asked questions
- How many kilogram square meters are in one pound square inch?
- One pound square inch = 0.0002926396534292 kg·m² (kilogram square meters).
- How many pound square feet are in one pound square inch?
- One pound square inch ≈ 0.006944444444 lb·ft² (pound square feet).
- How many kilogram square centimeters are in one pound square inch?
- One pound square inch = 2.926396534292 kg·cm² (kilogram square centimeters).