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inHg to mmHg converter

Convert inches of mercury (inHg) to millimetres of mercury (mmHg). 1 inHg = 25.4 mmHg.

Calculating…

Conversion factor

1 inHg = 25.4 mmHg · 1 mmHg = 0.0393701 inHg

inHg to mmHg table

inHgmmHg
1 inHg25.4 mmHg
2 inHg50.8 mmHg
3 inHg76.2 mmHg
4 inHg101.6 mmHg
5 inHg127 mmHg
6 inHg152.4 mmHg
7 inHg177.8 mmHg
8 inHg203.2 mmHg
9 inHg228.6 mmHg
10 inHg254 mmHg
12 inHg304.8 mmHg
14 inHg355.6 mmHg
15 inHg381 mmHg
16 inHg406.4 mmHg
18 inHg457.2 mmHg
20 inHg508 mmHg
22 inHg558.8 mmHg
24 inHg609.6 mmHg
25 inHg635 mmHg
26 inHg660.4 mmHg
28 inHg711.2 mmHg
29 inHg736.6 mmHg
29.92 inHg759.968 mmHg
30 inHg762 mmHg

1 bar = 14.504 psi = 100 kPa = 29.53 inHg. Gauge pressure (barg, psig) is measured above atmospheric; absolute pressure (bara, psia) adds about 1.013 bar / 14.7 psi. This converter changes units only. For vacuum readings, use the vacuum converter.

inHg and mmHg values assume mercury at 0 °C; inH₂O uses water at 4 °C. Those are the conventional definitions used by most gauge makers.

inHg is often used for vacuum gauges, reading below atmosphere. If your gauge says "inHg vac", use the vacuum converter to get absolute pressure; this page converts the unit only.