Convert psi to Millimeters of Mercury
1 psi equals 51.7149252 millimeters of mercury (mmHg).
1 psi = 51.7149252 mmHg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk psi to millimeter of mercury converter to paste a column from Excel.
How to Convert psi to Millimeter of Mercury
- 1 psi = 51.7149252 mmHg
- 1 mmHg = 0.01933677746 psi
- Example: convert 15 psi to mmHg: 15 psi = 15 × 51.7149252 mmHg = 775.7238781 mmHg
Reference conditions. mmHg: Conventional mercury column: ρ = 13 595.1 kg/m³ and gₙ = 9.80665 m/s² (≈ mercury at 0 °C / 32 °F).
Formula
mmHg = psi × 51.71492520387
Derivation from SI units:
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 mmHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.001 m = 133.322387415 Pa
- 1 psi = 6894.757293168 Pa ÷ 133.322387415 Pa per mmHg = 51.71492520387 mmHg
Both units are defined exactly, so the factor is exact. psi definition: psi; Millimeter of Mercury definition: millimeter of mercury.
Worked examples
- 1 psi equals 51.7149252 mmHg.
1 psi × 51.7149252 = 51.7149252 mmHg - The standard atmosphere, 14.696 psi, is 760.0025408 mmHg.
14.696 psi × 51.7149252 = 760.0025408 mmHg
psi to Millimeter of Mercury conversion table
| psi | Millimeters of Mercury (mmHg) |
|---|---|
| 0.01 psi | 0.517149252 mmHg |
| 0.05 psi | 2.58574626 mmHg |
| 0.1 psi | 5.17149252 mmHg |
| 0.25 psi | 12.9287313 mmHg |
| 0.5 psi | 25.8574626 mmHg |
| 1 psi | 51.7149252 mmHg |
| 2 psi | 103.4298504 mmHg |
| 5 psi | 258.574626 mmHg |
| 10 psi | 517.149252 mmHg |
| 14.7 psi | 760.2094005 mmHg |
| 15 psi | 775.7238781 mmHg |
| 20 psi | 1034.298504 mmHg |
| 25 psi | 1292.87313 mmHg |
| 30 psi | 1551.447756 mmHg |
| 32 psi | 1654.877607 mmHg |
| 35 psi | 1810.022382 mmHg |
| 40 psi | 2068.597008 mmHg |
| 50 psi | 2585.74626 mmHg |
| 60 psi | 3102.895512 mmHg |
| 80 psi | 4137.194016 mmHg |
| 100 psi | 5171.49252 mmHg |
| 125 psi | 6464.36565 mmHg |
| 150 psi | 7757.238781 mmHg |
| 200 psi | 10342.98504 mmHg |
| 500 psi | 25857.4626 mmHg |
| 1000 psi | 51714.9252 mmHg |
| 3000 psi | 155144.7756 mmHg |
| 5000 psi | 258574.626 mmHg |
Where it's used
Vacuum pumps and medical gas equipment sometimes list psi and mmHg side by side. One psi is about 51.7 mmHg.
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 mmHg is 1 psi?
1 psi = 51.7149252 mmHg.
How many millimeters of mercury are in 1 psi?
1 psi = 51.7149252 mmHg.
How do I convert psi to millimeters of mercury?
Multiply the value in psi by 51.7149252. For example, 15 psi × 51.7149252 = 775.7238781 mmHg.
Is the psi to mmHg 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, "millimeter of mercury, conventional (mmHg)".
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 Millimeters of Mercury. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/psi-to-millimeter-of-mercury/
IEEE
Scientific Converters, "Convert psi to Millimeters of Mercury," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/psi-to-millimeter-of-mercury/