mmHg to PSI Converter
Quick answer: To convert mmHg to PSI, multiply by 0.01933678. For example, 10 mmHg is 0.1933678 psi. One millimeter of mercury equals 0.01933678 psi.
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Use the mmHg to PSI Converter
mmHg to PSI formula and what each symbol means
psi = mmHg × 0.01933678
| Symbol | Meaning |
|---|---|
| mmHg | Millimeter of mercury |
| psi | Pound per square inch |
mmHg to PSI examples
1 mmHg
1 mmHg × 0.01933678 = 0.01933678 psi.
10 mmHg
10 mmHg × 0.01933678 = 0.1933678 psi.
100 mmHg
100 mmHg × 0.01933678 = 1.933678 psi.
mmHg compared with PSI
One psi is 51.71 times as large as one mmHg, so your number gets smaller when you convert mmHg to PSI and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About mmHg and PSI
Millimeter of mercury (mmHg): Millimetre of mercury, about 133.322 pascals. Pound per square inch (psi): One pound-force per square inch, about 6,894.757 pascals.
Where mmHg to PSI 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 mmHg to PSI step by step
- Enter the value in mmHg (the starting unit).
- Multiply by 0.01933678, because 1 mmHg = 0.01933678 psi.
- The product is the value in psi. To go back, divide by 0.01933678 or multiply by 51.71493.
Popular pressure conversions
How to read your mmHg to PSI result
Quick estimate: multiply by about 0.019 to get PSI from mmHg; this is within 1.8% of the exact factor. The pascal is the SI unit, but gauges use bar, psi, atmospheres or mmHg depending on the field.
| MMHG | PSI |
|---|---|
| 1 | 0.01933678 |
| 2 | 0.03867355 |
| 5 | 0.09668389 |
| 10 | 0.1933678 |
| 20 | 0.3867355 |
| 50 | 0.9668389 |
| 100 | 1.933678 |
| 1,000 | 19.33678 |
PSI to mmHg: quick table
| PSI | MMHG |
|---|---|
| 1 | 51.71493 |
| 5 | 258.5746 |
| 10 | 517.1493 |
| 25 | 1,292.873 |
| 50 | 2,585.746 |
| 100 | 5,171.493 |
| 250 | 12,928.73 |
| 500 | 25,857.46 |
Common mistakes when calculating mmHg to PSI
- Reading mmHg and Torr as clearly different units: they differ by only about one part in seven million.
- Dividing when you should multiply: from mmHg to psi multiply by 0.01933678; from psi to mmHg divide by 0.01933678.
mmHg to PSI FAQ
How many psi are in 1 mmHg?
1 mmHg equals 0.01933678 psi.
How many mmHg are in 1 psi?
1 psi equals 51.71493 mmHg.
Is 1 mmHg = 0.01933678 psi an exact conversion?
The factor is shown rounded to 7 significant figures (0.01933678). The calculator above uses more digits.
What is a millimeter of mercury (mmHg)?
Millimetre of mercury, about 133.322 pascals.
How can I estimate mmHg to PSI in my head?
Quick estimate: multiply by about 0.019 to get PSI from mmHg; this is within 1.8% of the exact factor.
What is 7 mmHg in PSI?
7 mmHg = 0.1353574 psi (since 7 × 0.01933678).
What is 40 mmHg in PSI?
40 mmHg = 0.7734711 psi (since 40 × 0.01933678).
What is 200 mmHg in PSI?
200 mmHg = 3.867355 psi (since 200 × 0.01933678).
How many decimals should I keep when converting mmHg to psi?
Match the precision of your original measurement. For example, 0.1933678 psi rounds to 0.193 psi at 3 significant figures; keep more digits only for engineering or scientific work.
More in Pressure converters
- Pascals to kPa Converter
- mmHg to Bar Converter
- Pascals to mmHg Converter
- mmHg to Atmospheres Converter
- Pascals to PSI Converter
- kPa to PSI Converter
See all pressure converters tools · All Conversion calculators · Site map
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