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mmHg to PSI Converter
Convert millimeters of mercury to pounds per square inch in one step. Results update live in both directions, with a worked formula, nearby units and a 1–100 chart you can click.
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mmHg
psi
Step-by-step calculation
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How to use the mmHg to PSI Converter
- Type a value in the Millimeters of mercury box. The PSI result appears instantly.
- Going the other way? Type in the PSI box, or press the ⇄ swap button.
- Set the precision with the decimal places menu.
- Check the working in the step-by-step box, then press Copy result or click any row in the tables below.
Millimeters of mercury to PSI formula
psi = mmHg ÷ 51.7149252
- Take the value in millimeters of mercury.
- Divide it by
51.7149252(the number of millimeters of mercury in one pound per square inch).
Example: 120 mmHg ÷ 51.7149252 = 2.32041 psi.
Reverse formula (pounds per square inch to millimeters of mercury): mmHg = psi × 51.7149252. Example: 2.70715 psi × 51.7149252 = 140 mmHg.
Quick mental estimate: divide by about 52. For exact answers use the converter above.
mmHg to psi conversion table (1–100)
Click any row to load it into the converter.
Millimeters of mercury to PSI
| Millimeters of mercury | PSI |
|---|---|
| 1 mmHg | 0.0193 psi |
| 2 mmHg | 0.0387 psi |
| 3 mmHg | 0.058 psi |
| 4 mmHg | 0.0773 psi |
| 5 mmHg | 0.0967 psi |
| 6 mmHg | 0.116 psi |
| 7 mmHg | 0.1354 psi |
| 8 mmHg | 0.1547 psi |
| 9 mmHg | 0.174 psi |
| 10 mmHg | 0.1934 psi |
| 11 mmHg | 0.2127 psi |
| 12 mmHg | 0.232 psi |
| 13 mmHg | 0.2514 psi |
| 14 mmHg | 0.2707 psi |
| 15 mmHg | 0.2901 psi |
| 16 mmHg | 0.3094 psi |
| 17 mmHg | 0.3287 psi |
| 18 mmHg | 0.3481 psi |
| 19 mmHg | 0.3674 psi |
| 20 mmHg | 0.3867 psi |
| 21 mmHg | 0.4061 psi |
| 22 mmHg | 0.4254 psi |
| 23 mmHg | 0.4447 psi |
| 24 mmHg | 0.4641 psi |
| 25 mmHg | 0.4834 psi |
| 26 mmHg | 0.5028 psi |
| 27 mmHg | 0.5221 psi |
| 28 mmHg | 0.5414 psi |
| 29 mmHg | 0.5608 psi |
| 30 mmHg | 0.5801 psi |
| 31 mmHg | 0.5994 psi |
| 32 mmHg | 0.6188 psi |
| 33 mmHg | 0.6381 psi |
| 34 mmHg | 0.6575 psi |
| 35 mmHg | 0.6768 psi |
| 36 mmHg | 0.6961 psi |
| 37 mmHg | 0.7155 psi |
| 38 mmHg | 0.7348 psi |
| 39 mmHg | 0.7541 psi |
| 40 mmHg | 0.7735 psi |
| 41 mmHg | 0.7928 psi |
| 42 mmHg | 0.8121 psi |
| 43 mmHg | 0.8315 psi |
| 44 mmHg | 0.8508 psi |
| 45 mmHg | 0.8702 psi |
| 46 mmHg | 0.8895 psi |
| 47 mmHg | 0.9088 psi |
| 48 mmHg | 0.9282 psi |
| 49 mmHg | 0.9475 psi |
| 50 mmHg | 0.9668 psi |
| 51 mmHg | 0.9862 psi |
| 52 mmHg | 1.0055 psi |
| 53 mmHg | 1.0248 psi |
| 54 mmHg | 1.0442 psi |
| 55 mmHg | 1.0635 psi |
| 56 mmHg | 1.0829 psi |
| 57 mmHg | 1.1022 psi |
| 58 mmHg | 1.1215 psi |
| 59 mmHg | 1.1409 psi |
| 60 mmHg | 1.1602 psi |
| 61 mmHg | 1.1795 psi |
| 62 mmHg | 1.1989 psi |
| 63 mmHg | 1.2182 psi |
| 64 mmHg | 1.2376 psi |
| 65 mmHg | 1.2569 psi |
| 66 mmHg | 1.2762 psi |
| 67 mmHg | 1.2956 psi |
| 68 mmHg | 1.3149 psi |
| 69 mmHg | 1.3342 psi |
| 70 mmHg | 1.3536 psi |
| 71 mmHg | 1.3729 psi |
| 72 mmHg | 1.3922 psi |
| 73 mmHg | 1.4116 psi |
| 74 mmHg | 1.4309 psi |
| 75 mmHg | 1.4503 psi |
| 76 mmHg | 1.4696 psi |
| 77 mmHg | 1.4889 psi |
| 78 mmHg | 1.5083 psi |
| 79 mmHg | 1.5276 psi |
| 80 mmHg | 1.5469 psi |
| 81 mmHg | 1.5663 psi |
| 82 mmHg | 1.5856 psi |
| 83 mmHg | 1.605 psi |
| 84 mmHg | 1.6243 psi |
| 85 mmHg | 1.6436 psi |
| 86 mmHg | 1.663 psi |
| 87 mmHg | 1.6823 psi |
| 88 mmHg | 1.7016 psi |
| 89 mmHg | 1.721 psi |
| 90 mmHg | 1.7403 psi |
| 91 mmHg | 1.7596 psi |
| 92 mmHg | 1.779 psi |
| 93 mmHg | 1.7983 psi |
| 94 mmHg | 1.8177 psi |
| 95 mmHg | 1.837 psi |
| 96 mmHg | 1.8563 psi |
| 97 mmHg | 1.8757 psi |
| 98 mmHg | 1.895 psi |
| 99 mmHg | 1.9143 psi |
| 100 mmHg | 1.9337 psi |
PSI to millimeters of mercury
| PSI | Millimeters of mercury |
|---|---|
| 1 psi | 51.7149 mmHg |
| 2 psi | 103.4299 mmHg |
| 3 psi | 155.1448 mmHg |
| 4 psi | 206.8597 mmHg |
| 5 psi | 258.5746 mmHg |
| 6 psi | 310.2896 mmHg |
| 7 psi | 362.0045 mmHg |
| 8 psi | 413.7194 mmHg |
| 9 psi | 465.4343 mmHg |
| 10 psi | 517.1493 mmHg |
| 11 psi | 568.8642 mmHg |
| 12 psi | 620.5791 mmHg |
| 13 psi | 672.294 mmHg |
| 14 psi | 724.009 mmHg |
| 15 psi | 775.7239 mmHg |
| 16 psi | 827.4388 mmHg |
| 17 psi | 879.1537 mmHg |
| 18 psi | 930.8687 mmHg |
| 19 psi | 982.5836 mmHg |
| 20 psi | 1,034.2985 mmHg |
| 21 psi | 1,086.0134 mmHg |
| 22 psi | 1,137.7284 mmHg |
| 23 psi | 1,189.4433 mmHg |
| 24 psi | 1,241.1582 mmHg |
| 25 psi | 1,292.8731 mmHg |
| 26 psi | 1,344.5881 mmHg |
| 27 psi | 1,396.303 mmHg |
| 28 psi | 1,448.0179 mmHg |
| 29 psi | 1,499.7328 mmHg |
| 30 psi | 1,551.4478 mmHg |
| 31 psi | 1,603.1627 mmHg |
| 32 psi | 1,654.8776 mmHg |
| 33 psi | 1,706.5925 mmHg |
| 34 psi | 1,758.3075 mmHg |
| 35 psi | 1,810.0224 mmHg |
| 36 psi | 1,861.7373 mmHg |
| 37 psi | 1,913.4522 mmHg |
| 38 psi | 1,965.1672 mmHg |
| 39 psi | 2,016.8821 mmHg |
| 40 psi | 2,068.597 mmHg |
| 41 psi | 2,120.3119 mmHg |
| 42 psi | 2,172.0269 mmHg |
| 43 psi | 2,223.7418 mmHg |
| 44 psi | 2,275.4567 mmHg |
| 45 psi | 2,327.1716 mmHg |
| 46 psi | 2,378.8866 mmHg |
| 47 psi | 2,430.6015 mmHg |
| 48 psi | 2,482.3164 mmHg |
| 49 psi | 2,534.0313 mmHg |
| 50 psi | 2,585.7463 mmHg |
| 51 psi | 2,637.4612 mmHg |
| 52 psi | 2,689.1761 mmHg |
| 53 psi | 2,740.891 mmHg |
| 54 psi | 2,792.606 mmHg |
| 55 psi | 2,844.3209 mmHg |
| 56 psi | 2,896.0358 mmHg |
| 57 psi | 2,947.7507 mmHg |
| 58 psi | 2,999.4657 mmHg |
| 59 psi | 3,051.1806 mmHg |
| 60 psi | 3,102.8955 mmHg |
| 61 psi | 3,154.6104 mmHg |
| 62 psi | 3,206.3254 mmHg |
| 63 psi | 3,258.0403 mmHg |
| 64 psi | 3,309.7552 mmHg |
| 65 psi | 3,361.4701 mmHg |
| 66 psi | 3,413.1851 mmHg |
| 67 psi | 3,464.9 mmHg |
| 68 psi | 3,516.6149 mmHg |
| 69 psi | 3,568.3298 mmHg |
| 70 psi | 3,620.0448 mmHg |
| 71 psi | 3,671.7597 mmHg |
| 72 psi | 3,723.4746 mmHg |
| 73 psi | 3,775.1895 mmHg |
| 74 psi | 3,826.9045 mmHg |
| 75 psi | 3,878.6194 mmHg |
| 76 psi | 3,930.3343 mmHg |
| 77 psi | 3,982.0492 mmHg |
| 78 psi | 4,033.7642 mmHg |
| 79 psi | 4,085.4791 mmHg |
| 80 psi | 4,137.194 mmHg |
| 81 psi | 4,188.9089 mmHg |
| 82 psi | 4,240.6239 mmHg |
| 83 psi | 4,292.3388 mmHg |
| 84 psi | 4,344.0537 mmHg |
| 85 psi | 4,395.7686 mmHg |
| 86 psi | 4,447.4836 mmHg |
| 87 psi | 4,499.1985 mmHg |
| 88 psi | 4,550.9134 mmHg |
| 89 psi | 4,602.6283 mmHg |
| 90 psi | 4,654.3433 mmHg |
| 91 psi | 4,706.0582 mmHg |
| 92 psi | 4,757.7731 mmHg |
| 93 psi | 4,809.488 mmHg |
| 94 psi | 4,861.203 mmHg |
| 95 psi | 4,912.9179 mmHg |
| 96 psi | 4,964.6328 mmHg |
| 97 psi | 5,016.3477 mmHg |
| 98 psi | 5,068.0627 mmHg |
| 99 psi | 5,119.7776 mmHg |
| 100 psi | 5,171.4925 mmHg |
Common values
| Millimeters of mercury | PSI | Example |
|---|---|---|
| 80 mmHg | 1.55 psi | Typical diastolic pressure |
| 100 mmHg | 1.93 psi | 100 mmHg |
| 120 mmHg | 2.32 psi | Typical systolic pressure |
| 140 mmHg | 2.71 psi | 140 mmHg |
| 160 mmHg | 3.09 psi | 160 mmHg |
| 760 mmHg | 14.7 psi | 1 atmosphere |
About millimeters of mercury and PSI
Millimeters of mercury (mmHg). Millimeters of mercury (mmHg) measure pressure by the height of a mercury column. Blood pressure is still recorded in mmHg; 760 mmHg is one standard atmosphere.
PSI (psi). Pounds per square inch (psi) is a US customary pressure unit, used for tyre pressure, air compressors and plumbing. One psi is about 6,894.76 pascals.
Frequently asked questions
What is 1 millimeter of mercury in pounds per square inch?
One millimeter of mercury equals 0.0193368 pounds per square inch. Looking at it the other way, one pound per square inch is 51.7149 millimeters of mercury.
How do you convert millimeters of mercury to pounds per square inch?
Divide the number of millimeters of mercury by 51.7149252. For example, 120 mmHg ÷ 51.7149252 = 2.32041 psi.
What is 140 millimeters of mercury in pounds per square inch?
140 mmHg is 2.70715 psi.
How do I convert pounds per square inch back to millimeters of mercury?
Multiply by 51.7149252, or press the ⇄ swap button above. For example, 2.70715 psi × 51.7149252 = 140 mmHg.
How many mmHg are in one atmosphere?
Exactly 760 mmHg, which equals 101.325 kPa or 14.696 psi. This is also the definition of the torr: 1 atm = 760 torr.
What is the difference between psi and psig?
psig is gauge pressure (above the surrounding air), which is what tyre gauges show; psia is absolute pressure. Atmospheric pressure at sea level is about 14.7 psi, 1.013 bar or 101.3 kPa.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.
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