Convert psi to Inches of Mercury
1 psi equals 2.036020677 inches of mercury (inHg).
1 psi = 2.036020677 inHg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk psi to inch of mercury converter to paste a column from Excel.
How to Convert psi to Inch of Mercury
- 1 psi = 2.036020677 inHg
- 1 inHg = 0.4911541475 psi
- Example: convert 15 psi to inHg: 15 psi = 15 × 2.036020677 inHg = 30.54031016 inHg
Reference conditions. inHg: Conventional mercury column: ρ = 13 595.1 kg/m³ and gₙ = 9.80665 m/s² (≈ mercury at 0 °C / 32 °F).
Formula
inHg = psi × 2.036020677318
Derivation from SI units:
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 inHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.0254 m = 3386.388640341 Pa
- 1 psi = 6894.757293168 Pa ÷ 3386.388640341 Pa per inHg = 2.036020677318 inHg
Both units are defined exactly, so the factor is exact. psi definition: psi; Inch of Mercury definition: inch of mercury.
Worked examples
- 14.696 psi equals 29.92135987 inHg.
14.696 psi × 2.036020677 = 29.92135987 inHg - A vacuum of 5 psi below atmospheric is 10.18010339 inHg.
5 psi × 2.036020677 = 10.18010339 inHg
psi to Inch of Mercury conversion table
| psi | Inches of Mercury (inHg) |
|---|---|
| 0.01 psi | 0.02036020677 inHg |
| 0.05 psi | 0.1018010339 inHg |
| 0.1 psi | 0.2036020677 inHg |
| 0.25 psi | 0.5090051693 inHg |
| 0.5 psi | 1.018010339 inHg |
| 1 psi | 2.036020677 inHg |
| 2 psi | 4.072041355 inHg |
| 5 psi | 10.18010339 inHg |
| 10 psi | 20.36020677 inHg |
| 14.7 psi | 29.92950396 inHg |
| 15 psi | 30.54031016 inHg |
| 20 psi | 40.72041355 inHg |
| 25 psi | 50.90051693 inHg |
| 30 psi | 61.08062032 inHg |
| 32 psi | 65.15266167 inHg |
| 35 psi | 71.26072371 inHg |
| 40 psi | 81.44082709 inHg |
| 50 psi | 101.8010339 inHg |
| 60 psi | 122.1612406 inHg |
| 80 psi | 162.8816542 inHg |
| 100 psi | 203.6020677 inHg |
| 125 psi | 254.5025847 inHg |
| 150 psi | 305.4031016 inHg |
| 200 psi | 407.2041355 inHg |
| 500 psi | 1018.010339 inHg |
| 1000 psi | 2036.020677 inHg |
| 3000 psi | 6108.062032 inHg |
| 5000 psi | 10180.10339 inHg |
Where it's used
US vacuum gauges read inches of mercury, while pumps and pressure gauges use psi. One psi is about 2.036 inHg.
psi to other pressure units
| Conversion | 1 psi equals |
|---|---|
| psi to pascal | 6894.757293 Pa |
| psi to kilopascal | 6.894757293 kPa |
| psi to megapascal | 0.006894757293 MPa |
| psi to bar | 0.06894757293 bar |
| psi to millibar | 68.94757293 mbar |
| psi to decibar | 0.6894757293 dbar |
| psi to torr | 51.71493257 Torr |
| psi to millimeter of mercury | 51.7149252 mmHg |
| psi to millimeter of water | 703.0695796 mmH₂O |
| psi to centimeter of water | 70.30695796 cmH₂O |
| psi to inch of water | 27.67990471 inH₂O |
| psi to inch of water (60 °F) | 27.7075924 inH₂O (60 °F) |
| psi to inch of mercury | 2.036020677 inHg |
| psi to atmosphere | 0.06804596391 atm |
| psi to barye | 68947.57293 Ba |
Frequently asked questions
How many inHg is 1 psi?
1 psi = 2.036020677 inHg.
How many inches of mercury are in 1 psi?
1 psi = 2.036020677 inHg.
How do I convert psi to inches of mercury?
Multiply the value in psi by 2.036020677. For example, 15 psi × 2.036020677 = 30.54031016 inHg.
Is the psi to inHg conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force per square inch (psi)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch of mercury, conventional (inHg)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert psi to Inches of Mercury. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/psi-to-inch-of-mercury/
IEEE
Scientific Converters, "Convert psi to Inches of Mercury," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/psi-to-inch-of-mercury/