PSI to mmHg Converter
Quick answer: To convert PSI to mmHg, multiply by 51.71493. For example, 10 psi is 517.1493 mmHg. One pound per square inch equals 51.71493 mmHg.
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Use the PSI to mmHg Converter
PSI to mmHg formula and what each symbol means
mmHg = psi × 51.71493
| Symbol | Meaning |
|---|---|
| psi | Pound per square inch |
| mmHg | Millimeter of mercury |
PSI to mmHg examples
1 psi
1 psi × 51.71493 = 51.71493 mmHg.
10 psi
10 psi × 51.71493 = 517.1493 mmHg.
100 psi
100 psi × 51.71493 = 5,171.493 mmHg.
PSI compared with mmHg
One psi is 51.71 times as large as one mmHg, so your number gets bigger when you convert PSI to mmHg and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About PSI and mmHg
Pound per square inch (psi): One pound-force per square inch, about 6,894.757 pascals. Millimeter of mercury (mmHg): Millimetre of mercury, about 133.322 pascals.
Where PSI to mmHg conversions are used
Hydraulics, boilers and pneumatic tools list their limits in bar, psi or MPa. Tyre pressure is shown in psi, bar or kPa, depending on the vehicle and country.
How to calculate PSI to mmHg step by step
- Enter the value in psi (the starting unit).
- Multiply by 51.71493, because 1 psi = 51.71493 mmHg.
- The product is the value in mmHg. To go back, divide by 51.71493 or multiply by 0.01933678.
Popular pressure conversions
How to read your PSI to mmHg result
Quick estimate: multiply by about 52 to get mmHg from PSI; this is within 0.6% of the exact factor. The pascal is the SI unit, but gauges use bar, psi, atmospheres or mmHg depending on the field.
| PSI | MMHG |
|---|---|
| 1 | 51.71493 |
| 2 | 103.4299 |
| 5 | 258.5746 |
| 10 | 517.1493 |
| 20 | 1,034.299 |
| 50 | 2,585.746 |
| 100 | 5,171.493 |
| 1,000 | 51,714.93 |
mmHg to PSI: quick table
| MMHG | PSI |
|---|---|
| 1 | 0.01933678 |
| 5 | 0.09668389 |
| 10 | 0.1933678 |
| 25 | 0.4834194 |
| 50 | 0.9668389 |
| 100 | 1.933678 |
| 250 | 4.834194 |
| 500 | 9.668389 |
Common mistakes when calculating PSI to mmHg
- Reading mmHg and Torr as clearly different units: they differ by only about one part in seven million.
- Dividing when you should multiply: from psi to mmHg multiply by 51.71493; from mmHg to psi divide by 51.71493.
PSI to mmHg FAQ
How many mmHg are in 1 psi?
1 psi equals 51.71493 mmHg.
How many psi are in 1 mmHg?
1 mmHg equals 0.01933678 psi.
Is 1 psi = 51.71493 mmHg an exact conversion?
The factor is shown rounded to 7 significant figures (51.71493). The calculator above uses more digits.
What is a pound per square inch (psi)?
One pound-force per square inch, about 6,894.757 pascals.
How can I estimate PSI to mmHg in my head?
Quick estimate: multiply by about 52 to get mmHg from PSI; this is within 0.6% of the exact factor.
What is 300 psi in mmHg?
300 psi = 15,514.48 mmHg (since 300 × 51.71493).
What is 12 psi in mmHg?
12 psi = 620.5791 mmHg (since 12 × 51.71493).
What is 60 psi in mmHg?
60 psi = 3,102.896 mmHg (since 60 × 51.71493).
How many decimals should I keep when converting psi to mmHg?
Match the precision of your original measurement. For example, 517.1493 mmHg rounds to 517 mmHg at 3 significant figures; keep more digits only for engineering or scientific work.
More in Pressure converters
- Atmospheres to kPa Converter
- PSI to Atmospheres Converter
- Atmospheres to mmHg Converter
- Atmospheres to Pascals Converter
- Pascals to PSI Converter
- Atmospheres to PSI Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the SI derived units