inH2O to mmH2O, mbar, psi and mmHg Conversion Table

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.