Inches of mercury to Millimeters of mercury Conversion

  • inHg   mmHg
  •  
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The “inch of mercury” (inHg) is a unit of pressure commonly used in aviation, meteorology, and refrigeration. It originates from the barometric pressure measurement practice using a column of mercury. This unit became a staple due to its early adoption in weather forecasting and its accurate and consistent measurements. An interesting fact is that an inch of mercury is approximately equal to 33.86 millibars or 3386 Pascals, but what truly distinguishes it is its historical significance in the development of modern atmospheric science.

In the 17th century, Evangelista Torricelli, a student of Galileo, first discovered that atmospheric pressure could sustain a column of mercury, laying the groundwork for this unit. His invention, the barometer, revolutionized how we understand and predict weather, marking the inch of mercury as more than just a unit—it’s a nod to the evolution of scientific inquiry and practice.

Did you know?

The millimeter of mercury (mmHg) is a unit of pressure traditionally used in medicine and meteorology, and its history dates back to the barometer invention by Evangelista Torricelli in 1643. Often, it is associated with measuring blood pressure and intraocular pressure, representing the pressure exerted by a column of mercury precisely 1 millimeter high. This fascinating unit highlights the interplay of physics and medicine, reflecting both the force of blood circulating against vessel walls and the atmospheric pressure’s effects on our weather systems.

Interestingly, mmHg is one of the few units still officially sanctioned for use with SI (International System of Units) under specific legal and medical contexts, underscoring its importance over centuries. Despite the global shift towards using Pascals for pressure, mmHg remains ingrained in clinical settings because of its historical usage and direct relation to human physiology. Its origins and continued use illustrate how historical scientific instruments still influence modern practices.

> Inches of mercury to Millimeters of mercury Conversion Table

Inches of mercury Millimeters of mercury
0 inHg 0 mmHg
1 inHg 25.40008 mmHg
2 inHg 50.80015 mmHg
3 inHg 76.20023 mmHg
4 inHg 101.6003 mmHg
5 inHg 127.00038 mmHg
6 inHg 152.40046 mmHg
7 inHg 177.80053 mmHg
8 inHg 203.20061 mmHg
9 inHg 228.60069 mmHg
10 inHg 254.00076 mmHg
11 inHg 279.40084 mmHg
12 inHg 304.80091 mmHg
13 inHg 330.20099 mmHg
14 inHg 355.60107 mmHg
15 inHg 381.00114 mmHg
16 inHg 406.40122 mmHg
17 inHg 431.80129 mmHg
18 inHg 457.20137 mmHg
19 inHg 482.60145 mmHg
20 inHg 508.00152 mmHg
21 inHg 533.4016 mmHg
22 inHg 558.80168 mmHg
23 inHg 584.20175 mmHg
24 inHg 609.60183 mmHg
25 inHg 635.0019 mmHg
26 inHg 660.40198 mmHg
27 inHg 685.80206 mmHg
28 inHg 711.20213 mmHg
29 inHg 736.60221 mmHg
30 inHg 762.00228 mmHg
31 inHg 787.40236 mmHg
32 inHg 812.80244 mmHg
33 inHg 838.20251 mmHg
34 inHg 863.60259 mmHg
35 inHg 889.00267 mmHg
36 inHg 914.40274 mmHg
37 inHg 939.80282 mmHg
38 inHg 965.20289 mmHg
39 inHg 990.60297 mmHg
40 inHg 1016.00305 mmHg
41 inHg 1041.40312 mmHg
42 inHg 1066.8032 mmHg
43 inHg 1092.20327 mmHg
44 inHg 1117.60335 mmHg
45 inHg 1143.00343 mmHg
46 inHg 1168.4035 mmHg
47 inHg 1193.80358 mmHg
48 inHg 1219.20366 mmHg
49 inHg 1244.60373 mmHg
50 inHg 1270.00381 mmHg
51 inHg 1295.40388 mmHg
52 inHg 1320.80396 mmHg
53 inHg 1346.20404 mmHg
54 inHg 1371.60411 mmHg
55 inHg 1397.00419 mmHg
56 inHg 1422.40426 mmHg
57 inHg 1447.80434 mmHg
58 inHg 1473.20442 mmHg
59 inHg 1498.60449 mmHg
60 inHg 1524.00457 mmHg
61 inHg 1549.40465 mmHg
62 inHg 1574.80472 mmHg
63 inHg 1600.2048 mmHg
64 inHg 1625.60487 mmHg
65 inHg 1651.00495 mmHg
66 inHg 1676.40503 mmHg
67 inHg 1701.8051 mmHg
68 inHg 1727.20518 mmHg
69 inHg 1752.60525 mmHg
70 inHg 1778.00533 mmHg
71 inHg 1803.40541 mmHg
72 inHg 1828.80548 mmHg
73 inHg 1854.20556 mmHg
74 inHg 1879.60564 mmHg
75 inHg 1905.00571 mmHg
76 inHg 1930.40579 mmHg
77 inHg 1955.80586 mmHg
78 inHg 1981.20594 mmHg
79 inHg 2006.60602 mmHg
80 inHg 2032.00609 mmHg
81 inHg 2057.40617 mmHg
82 inHg 2082.80624 mmHg
83 inHg 2108.20632 mmHg
84 inHg 2133.6064 mmHg
85 inHg 2159.00647 mmHg
86 inHg 2184.40655 mmHg
87 inHg 2209.80663 mmHg
88 inHg 2235.2067 mmHg
89 inHg 2260.60678 mmHg
90 inHg 2286.00685 mmHg
91 inHg 2311.40693 mmHg
92 inHg 2336.80701 mmHg
93 inHg 2362.20708 mmHg
94 inHg 2387.60716 mmHg
95 inHg 2413.00723 mmHg
96 inHg 2438.40731 mmHg
97 inHg 2463.80739 mmHg
98 inHg 2489.20746 mmHg
99 inHg 2514.60754 mmHg
100 inHg 2540.00762 mmHg

> Other Conversions

Conversion
Inches of mercury to Pascals Go to converter
Inches of mercury to Kilopascals Go to converter
Inches of mercury to Megapascals Go to converter
Inches of mercury to Hectopascals Go to converter
Inches of mercury to Millibar Go to converter
Inches of mercury to Bar Go to converter
Inches of mercury to Torr Go to converter
Inches of mercury to Meters of water @ 4°C Go to converter
Inches of mercury to Pounds per square inch Go to converter
Inches of mercury to Kilopound per square inch Go to converter
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