Inches of Mercury to Pounds per Square Inch Converter
1 inch of mercury ≈ 0.491154194 pounds per square inch
1 inch of mercury equals 0.491154 pounds per square inch
How to convert inches of mercury to pounds per square inch
Unit conversion preserves the pressure reference. Gauge pressure and absolute pressure are different readings; changing between them also needs the ambient pressure. Mercury and water-column units use the conventions stated in their unit notes.
psi = inHg × 0.4911541938One inch of mercury is 0.4911541938 pounds per square inch, so a single multiplication converts any value.
4.91154 psi ≈ 10 × 0.4911541938Inches of mercury to pounds per square inch conversion table
Common values in inches of mercury, converted to pounds per square inch.
| Inches of mercury (inHg) | Pounds per square inch (psi) |
|---|---|
| 1 | 0.49115419 |
| 2 | 0.98230839 |
| 3 | 1.4734626 |
| 4 | 1.9646168 |
| 5 | 2.455771 |
| 10 | 4.9115419 |
| 20 | 9.8230839 |
| 25 | 12.278855 |
| 50 | 24.55771 |
| 100 | 49.115419 |
| 250 | 122.78855 |
| 500 | 245.5771 |
| 1,000 | 491.15419 |
About these units
inch of mercuryinHg
Exactly 25.4 mmHg. The US aviation and weather-report pressure unit.
pound per square inchpsi
One pound-force per square inch. The US standard for tyre and fluid pressure.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.