Convert Inches of Mercury to Pounds per Square Foot
Convert Inches of Mercury (inHg) to Pounds per Square Foot (lbf/ft²) instantly and accurately.
Conversion Formula
lbf/ft² = inHg × 70.72619724
About Inches of Mercury
One inch of mercury (inHg) ≈ 3,386 Pa - the primary barometric pressure unit in US aviation and meteorology. ASOS weather stations, METARs, and altimeter settings in the US report in inHg. Standard sea-level pressure is 29.92 inHg. Altimeters are set to local QNH in inHg to maintain altitude reference. US barometers for home weather stations display inHg. Typical pressure range: 28.5-31.0 inHg in continental weather systems. Record low: ~25.70 inHg (Typhoon Tip, 1979). 1 inHg = 3,386.39 Pa.
About Pounds per Square Foot
One pound per square foot (psf) ≈ 47.88 Pa - the standard structural engineering load unit in US practice. Building codes specify design loads in psf: residential floors 40 psf; office buildings 50-80 psf; assembly areas 100+ psf; snow loads can exceed 100 psf. Wind pressure on building facades, soil bearing capacity for shallow foundations, and lateral earth pressure in retaining walls are all in psf. The related unit ksf (1,000 psf = 47.88 kPa) covers higher-capacity soils and deep foundations. 1 psf = 47.88 Pa.
Quick Reference Table
| Inches of Mercury (inHg) | Pounds per Square Foot (lbf/ft²) |
|---|---|
| 1 inHg | 70.7262 lbf/ft² |
| 2 inHg | 141.452 lbf/ft² |
| 5 inHg | 353.631 lbf/ft² |
| 10 inHg | 707.262 lbf/ft² |
| 25 inHg | 1768.15 lbf/ft² |
| 50 inHg | 3536.31 lbf/ft² |
| 100 inHg | 7072.62 lbf/ft² |