Convert Pounds per Square Foot to Millimeters of Mercury
Convert Pounds per Square Foot (lbf/ft²) to Millimeters of Mercury (mmHg) instantly and accurately.
Conversion Formula
mmHg = lbf/ft² × 0.359131425
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.
About Millimeters of Mercury
One millimetre of mercury (mmHg) = pressure from 1 mm of mercury at 0°C and standard gravity = 133.322 Pa. Clinical medicine worldwide uses mmHg for blood pressure (normal ~120/80 mmHg) and for gas partial pressures in physiology: arterial O₂ ~95-100 mmHg; CO₂ ~40 mmHg; alveolar O₂ ~104 mmHg. Ophthalmologists measure intraocular pressure in mmHg (normal 10-21; glaucoma risk above 21). Vacuum equipment ratings are also given in mmHg. 760 mmHg = 1 atm. 1 mmHg = 133.322 Pa.
Quick Reference Table
| Pounds per Square Foot (lbf/ft²) | Millimeters of Mercury (mmHg) |
|---|---|
| 1 lbf/ft² | 0.359131 mmHg |
| 2 lbf/ft² | 0.718263 mmHg |
| 5 lbf/ft² | 1.79566 mmHg |
| 10 lbf/ft² | 3.59131 mmHg |
| 25 lbf/ft² | 8.97829 mmHg |
| 50 lbf/ft² | 17.9566 mmHg |
| 100 lbf/ft² | 35.9131 mmHg |