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Pressure

Millimeters of Mercury → PSI

mmHg → psi

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Based on U.S. National Institute of Standards

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Millimeters of Mercury to PSI Formula

To convert from Millimeters of Mercury to PSI, you can use the following formula:

PSI = Millimeters of Mercury × NaN

This means you need to multiply your Millimeters of Mercury value by NaN to get the equivalent value in PSI.

mmHg → psi Reference Table

mmHg psi
0.001 mmHg 0.00001933677746 psi
0.002 mmHg 0.00003867355492 psi
0.003 mmHg 0.00005801033238 psi
0.004 mmHg 0.00007734710984 psi
0.005 mmHg 0.0000966838873 psi
0.006 mmHg 0.0001160206648 psi
0.007 mmHg 0.0001353574422 psi
0.008 mmHg 0.0001546942197 psi
0.009 mmHg 0.0001740309971 psi
0.01 mmHg 0.0001933677746 psi
0.02 mmHg 0.0003867355492 psi
0.03 mmHg 0.0005801033238 psi
0.04 mmHg 0.0007734710984 psi
0.05 mmHg 0.000966838873 psi
0.06 mmHg 0.001160206648 psi
0.07 mmHg 0.001353574422 psi
0.08 mmHg 0.001546942197 psi
0.09 mmHg 0.001740309971 psi
0.1 mmHg 0.001933677746 psi
0.2 mmHg 0.003867355492 psi
0.3 mmHg 0.005801033238 psi
0.4 mmHg 0.007734710984 psi
0.5 mmHg 0.00966838873 psi
0.6 mmHg 0.01160206648 psi
0.7 mmHg 0.01353574422 psi
0.8 mmHg 0.01546942197 psi
0.9 mmHg 0.01740309971 psi
1 mmHg 0.01933677746 psi
1.5 mmHg 0.02900516619 psi
2 mmHg 0.03867355492 psi
2.5 mmHg 0.04834194365 psi
3 mmHg 0.05801033238 psi
3.5 mmHg 0.06767872111 psi
4 mmHg 0.07734710984 psi
4.5 mmHg 0.08701549857 psi
5 mmHg 0.0966838873 psi
5.5 mmHg 0.106352276 psi
6 mmHg 0.1160206648 psi
6.5 mmHg 0.1256890535 psi
7 mmHg 0.1353574422 psi
7.5 mmHg 0.1450258309 psi
8 mmHg 0.1546942197 psi
8.5 mmHg 0.1643626084 psi
9 mmHg 0.1740309971 psi
9.5 mmHg 0.1836993859 psi
10 mmHg 0.1933677746 psi
11 mmHg 0.2127045521 psi
12 mmHg 0.2320413295 psi
13 mmHg 0.251378107 psi
14 mmHg 0.2707148844 psi
15 mmHg 0.2900516619 psi
16 mmHg 0.3093884394 psi
17 mmHg 0.3287252168 psi
18 mmHg 0.3480619943 psi
19 mmHg 0.3673987717 psi
20 mmHg 0.3867355492 psi
25 mmHg 0.4834194365 psi
30 mmHg 0.5801033238 psi
35 mmHg 0.6767872111 psi
40 mmHg 0.7734710984 psi
45 mmHg 0.8701549857 psi
50 mmHg 0.966838873 psi
55 mmHg 1.06352276 psi
60 mmHg 1.160206648 psi
65 mmHg 1.256890535 psi
70 mmHg 1.353574422 psi
75 mmHg 1.450258309 psi
80 mmHg 1.546942197 psi
85 mmHg 1.643626084 psi
90 mmHg 1.740309971 psi
95 mmHg 1.836993859 psi
100 mmHg 1.933677746 psi
120 mmHg 2.320413295 psi
125 mmHg 2.417097182 psi
130 mmHg 2.51378107 psi
140 mmHg 2.707148844 psi
150 mmHg 2.900516619 psi
160 mmHg 3.093884394 psi
175 mmHg 3.383936055 psi
180 mmHg 3.480619943 psi
200 mmHg 3.867355492 psi
225 mmHg 4.350774928 psi
250 mmHg 4.834194365 psi
275 mmHg 5.317613801 psi
300 mmHg 5.801033238 psi
350 mmHg 6.767872111 psi
400 mmHg 7.734710984 psi
450 mmHg 8.701549857 psi
500 mmHg 9.66838873 psi
600 mmHg 11.60206648 psi
700 mmHg 13.53574422 psi
750 mmHg 14.50258309 psi
800 mmHg 15.46942197 psi
900 mmHg 17.40309971 psi
1000 mmHg 19.33677746 psi
1200 mmHg 23.20413295 psi
1250 mmHg 24.17097182 psi
1500 mmHg 29.00516619 psi
1750 mmHg 33.83936055 psi
2000 mmHg 38.67355492 psi
2500 mmHg 48.34194365 psi
3000 mmHg 58.01033238 psi
4000 mmHg 77.34710984 psi
4500 mmHg 87.01549857 psi
5000 mmHg 96.6838873 psi
6000 mmHg 116.0206648 psi
7000 mmHg 135.3574422 psi
7500 mmHg 145.0258309 psi
8000 mmHg 154.6942197 psi
9000 mmHg 174.0309971 psi
10000 mmHg 193.3677746 psi
15000 mmHg 290.0516619 psi
20000 mmHg 386.7355492 psi
25000 mmHg 483.4194365 psi
50000 mmHg 966.838873 psi
75000 mmHg 1450.258309 psi
100000 mmHg 1933.677746 psi

Why Convert Millimeters of Mercury to PSI?

Converting between millimeters of mercury (mmHg) and psi (psi) is one of the most common pressure conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert mmHg to psi saves time and prevents errors.

Pressure conversions between mmHg and psi are vital in automotive maintenance, meteorology, and scuba diving. Tire pressure affects fuel efficiency and safety, requiring drivers to convert between PSI and bar depending on the gauge used. Divers must strictly monitor pressure to avoid decompression sickness, often needing to convert depth and tank pressure readings. In weather forecasting, atmospheric pressure changes indicate approaching storms, with data often shared in different units globally. Failing to convert pressure accurately can lead to equipment failure, tire blowouts, or life-threatening situations underwater.

How to Convert Millimeters of Mercury to PSI

To convert millimeters of mercury to psi, use the following formula:

psi = mmHg × 0.01933677746

Example: 1 mmHg = 0.01933677746 psi

For example, 5 mmHg = 0.0966838873 psi, 10 mmHg = 0.1933677746 psi, and 100 mmHg = 1.933677746 psi. For larger values, 1000 mmHg = 19.33677746 psi. Conversely, 1 psi = 51.7149252 mmHg. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

  • Gauge vs Absolute: confusing gauge pressure (psig) with absolute pressure (psia).
  • Bar vs Pascal: 1 Bar is 100,000 Pascals, not 10 or 100.
  • Atmosphere variations: confusing standard atm with technical atm.

Pro Tips

  • Tire checks: Check tire pressure when cold (tires heat up and pressure rises while driving).
  • PSI rule: Typical car tires are 30-35 PSI.
  • Altitude effect: Air pressure drops as you go higher (ears popping).

What is a Millimeter of Mercury?

Millimeter of mercury.

Blood pressure and vacuum systems.

What is a PSI?

PSI (Pounds per Square Inch) is a unit of pressure in the Imperial and US customary systems. It represents the force of one pound-force applied to an area of one square inch.

PSI is the standard unit for tire pressure, industrial hydraulics, and compressed gas systems in the United States and UK.

Frequently Asked Questions

Pressure More Conversions

bar → psipsi → baratm → PaPa → atmbar → atmatm → bar

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