Look up a low pressure in inches of water column to find the conversion value in millimetres of water, millibar, pounds per square inch or millimetres of mercury.
Alternatively you can use the pressure unit converter to calculate the equivalent inches of water gauge value in other units.
The mmHg pressure units shown below are for mercury at 0°C, (32°F). The inH2O and mmH2O pressure units shown below are for water at 4°C (39.2°F).
inH2O Conversion Table
| inH2O | mmH2O | mbar | psi | mmHg |
|---|---|---|---|---|
| 0.1 | 2.54 | 0.249 | 0.004 | 0.187 |
| 0.2 | 5.08 | 0.498 | 0.007 | 0.374 |
| 0.3 | 7.62 | 0.747 | 0.011 | 0.560 |
| 0.4 | 10.16 | 0.996 | 0.014 | 0.747 |
| 0.5 | 12.70 | 1.245 | 0.018 | 0.934 |
| 0.6 | 15.24 | 1.495 | 0.022 | 1.121 |
| 0.7 | 17.78 | 1.744 | 0.025 | 1.308 |
| 0.8 | 20.32 | 1.993 | 0.029 | 1.495 |
| 0.9 | 22.86 | 2.242 | 0.033 | 1.681 |
| 1 | 25.40 | 2.491 | 0.036 | 1.868 |
| 2 | 50.80 | 4.982 | 0.072 | 3.737 |
| 3 | 76.20 | 7.473 | 0.108 | 5.605 |
| 4 | 101.6 | 9.964 | 0.145 | 7.473 |
| 5 | 127.0 | 12.45 | 0.181 | 9.342 |
| 6 | 152.4 | 14.95 | 0.217 | 11.21 |
| 7 | 177.8 | 17.44 | 0.253 | 13.08 |
| 8 | 203.2 | 19.93 | 0.289 | 14.95 |
| 9 | 228.6 | 22.42 | 0.325 | 16.81 |
| 10 | 254.0 | 24.91 | 0.361 | 18.68 |
| 11 | 279.4 | 27.40 | 0.397 | 20.55 |
| 12 | 304.8 | 29.89 | 0.434 | 22.42 |
| 13 | 330.2 | 32.38 | 0.470 | 24.29 |
| 14 | 355.6 | 34.87 | 0.506 | 26.16 |
| 15 | 381.0 | 37.36 | 0.542 | 28.02 |
| 16 | 406.4 | 39.85 | 0.578 | 29.89 |
| 17 | 431.8 | 42.35 | 0.614 | 31.76 |
| 18 | 457.2 | 44.84 | 0.650 | 33.63 |
| 19 | 482.6 | 47.33 | 0.686 | 35.50 |
| 20 | 508.0 | 49.82 | 0.723 | 37.37 |
| 21 | 533.4 | 52.31 | 0.759 | 39.23 |
| 22 | 558.8 | 54.80 | 0.795 | 41.10 |
| 23 | 584.2 | 57.29 | 0.831 | 42.97 |
| 24 | 609.6 | 59.78 | 0.867 | 44.84 |
| 25 | 635.0 | 62.27 | 0.903 | 46.71 |
| 26 | 660.4 | 64.76 | 0.939 | 48.58 |
| 27 | 685.8 | 67.25 | 0.975 | 50.44 |
| 28 | 711.2 | 69.74 | 1.012 | 52.31 |
| 29 | 736.6 | 72.24 | 1.048 | 54.18 |
| 30 | 762.0 | 74.73 | 1.084 | 56.05 |
| 31 | 787.4 | 77.22 | 1.120 | 57.92 |
| 32 | 812.8 | 79.71 | 1.156 | 59.79 |
| 33 | 838.2 | 82.20 | 1.192 | 61.65 |
| 34 | 863.6 | 84.69 | 1.228 | 63.52 |
| 35 | 889.0 | 87.18 | 1.264 | 65.39 |
| 36 | 914.4 | 89.67 | 1.301 | 67.26 |
| 37 | 939.8 | 92.16 | 1.337 | 69.13 |
| 38 | 965.2 | 94.65 | 1.373 | 71.00 |
| 39 | 990.6 | 97.14 | 1.409 | 72.86 |
| 40 | 1016 | 99.64 | 1.445 | 74.73 |
| 41 | 1041 | 102.1 | 1.481 | 76.60 |
| 42 | 1067 | 104.6 | 1.517 | 78.47 |
| 43 | 1092 | 107.1 | 1.553 | 80.34 |
| 44 | 1118 | 109.6 | 1.590 | 82.21 |
| 45 | 1143 | 112.1 | 1.626 | 84.07 |
| 46 | 1168 | 114.6 | 1.662 | 85.94 |
| 47 | 1194 | 117.1 | 1.698 | 87.81 |
| 48 | 1219 | 119.6 | 1.734 | 89.68 |
| 49 | 1245 | 122.1 | 1.770 | 91.55 |
| 50 | 1270 | 124.5 | 1.806 | 93.42 |
| 51 | 1295 | 127.0 | 1.842 | 95.28 |
| 52 | 1321 | 129.5 | 1.879 | 97.15 |
| 53 | 1346 | 132.0 | 1.915 | 99.02 |
| 54 | 1372 | 134.5 | 1.951 | 100.9 |
| 55 | 1397 | 137.0 | 1.987 | 102.8 |
| 56 | 1422 | 139.5 | 2.023 | 104.6 |
| 57 | 1448 | 142.0 | 2.059 | 106.5 |
| 58 | 1473 | 144.5 | 2.095 | 108.4 |
| 59 | 1499 | 147.0 | 2.132 | 110.2 |
| 60 | 1524 | 149.5 | 2.168 | 112.1 |
| 61 | 1549 | 151.9 | 2.204 | 114.0 |
| 62 | 1575 | 154.4 | 2.240 | 115.8 |
| 63 | 1600 | 156.9 | 2.276 | 117.7 |
| 64 | 1626 | 159.4 | 2.312 | 119.6 |
| 65 | 1651 | 161.9 | 2.348 | 121.4 |
| 66 | 1676 | 164.4 | 2.384 | 123.3 |
| 67 | 1702 | 166.9 | 2.421 | 125.2 |
| 68 | 1727 | 169.4 | 2.457 | 127.0 |
| 69 | 1753 | 171.9 | 2.493 | 128.9 |
| 70 | 1778 | 174.4 | 2.529 | 130.8 |
| 71 | 1803 | 176.9 | 2.565 | 132.7 |
| 72 | 1829 | 179.3 | 2.601 | 134.5 |
| 73 | 1854 | 181.8 | 2.637 | 136.4 |
| 74 | 1880 | 184.3 | 2.673 | 138.3 |
| 75 | 1905 | 186.8 | 2.710 | 140.1 |
| 76 | 1930 | 189.3 | 2.746 | 142.0 |
| 77 | 1956 | 191.8 | 2.782 | 143.9 |
| 78 | 1981 | 194.3 | 2.818 | 145.7 |
| 79 | 2007 | 196.8 | 2.854 | 147.6 |
| 80 | 2032 | 199.3 | 2.890 | 149.5 |
| 81 | 2057 | 201.8 | 2.926 | 151.3 |
| 82 | 2083 | 204.3 | 2.962 | 153.2 |
| 83 | 2108 | 206.7 | 2.999 | 155.1 |
| 84 | 2134 | 209.2 | 3.035 | 156.9 |
| 85 | 2159 | 211.7 | 3.071 | 158.8 |
| 86 | 2184 | 214.2 | 3.107 | 160.7 |
| 87 | 2210 | 216.7 | 3.143 | 162.5 |
| 88 | 2235 | 219.2 | 3.179 | 164.4 |
| 89 | 2261 | 221.7 | 3.215 | 166.3 |
| 90 | 2286 | 224.2 | 3.251 | 168.1 |
| 91 | 2311 | 226.7 | 3.288 | 170.0 |
| 92 | 2337 | 229.2 | 3.324 | 171.9 |
| 93 | 2362 | 231.7 | 3.360 | 173.8 |
| 94 | 2388 | 234.1 | 3.396 | 175.6 |
| 95 | 2413 | 236.6 | 3.432 | 177.5 |
| 96 | 2438 | 239.1 | 3.468 | 179.4 |
| 97 | 2464 | 241.6 | 3.504 | 181.2 |
| 98 | 2489 | 244.1 | 3.540 | 183.1 |
| 99 | 2515 | 246.6 | 3.577 | 185.0 |
| 100 | 2540 | 249.1 | 3.613 | 186.8 |
| 110 | 2794 | 274.0 | 3.974 | 205.5 |
| 120 | 3048 | 298.9 | 4.335 | 224.2 |
| 130 | 3302 | 323.8 | 4.697 | 242.9 |
| 140 | 3556 | 348.7 | 5.058 | 261.6 |
| 150 | 3810 | 373.6 | 5.419 | 280.2 |
| 160 | 4064 | 398.5 | 5.780 | 298.9 |
| 170 | 4318 | 423.5 | 6.142 | 317.6 |
| 180 | 4572 | 448.4 | 6.503 | 336.3 |
| 190 | 4826 | 473.3 | 6.864 | 355.0 |
| 200 | 5080 | 498.2 | 7.225 | 373.7 |
| 210 | 5334 | 523.1 | 7.587 | 392.3 |
| 220 | 5588 | 548.0 | 7.948 | 411.0 |
| 230 | 5842 | 572.9 | 8.309 | 429.7 |
| 240 | 6096 | 597.8 | 8.671 | 448.4 |
| 250 | 6350 | 622.7 | 9.032 | 467.1 |
| 260 | 6604 | 647.6 | 9.393 | 485.8 |
| 270 | 6858 | 672.5 | 9.754 | 504.4 |
| 280 | 7112 | 697.4 | 10.12 | 523.1 |
| 290 | 7366 | 722.4 | 10.48 | 541.8 |
| 300 | 7620 | 747.3 | 10.84 | 560.5 |
| 310 | 7874 | 772.2 | 11.20 | 579.2 |
| 320 | 8128 | 797.1 | 11.56 | 597.9 |
| 330 | 8382 | 822.0 | 11.92 | 616.5 |
| 340 | 8636 | 846.9 | 12.28 | 635.2 |
| 350 | 8890 | 871.8 | 12.64 | 653.9 |
| 360 | 9144 | 896.7 | 13.01 | 672.6 |
| 370 | 9398 | 921.6 | 13.37 | 691.3 |
| 380 | 9652 | 946.5 | 13.73 | 710.0 |
| 390 | 9906 | 971.4 | 14.09 | 728.6 |
| 400 | 10160 | 996.4 | 14.45 | 747.3 |
To convert pressure from inH2O to a higher precision use this pressure unit converter.