inHg to inH2O Converter
Pressure · unit-converter
Convert inHg to inH2O with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations bridge through pascal with fixed definitions (standard atmosphere = 101,325 Pa; torr and mmHg = atm/760; plus industrial/manometer units like kgf/cm², inHg, inH2O, and mmH2O).
About inHg
Inches of mercury (inHg) is used in aviation altimetry and vacuum readings in some US contexts.
About inH2O
Inches of water column (inH2O) is common in low-pressure HVAC and duct static-pressure measurements.
How to convert inch of mercury (inhg) to inch of water (inh2o, 4 °c)
1 inhg equals 13.595098063137375 inh2o in this tool (via pascal):
1 inhg = (3386.38815789 Pa ÷ 249.08891 Pa) inh2o = 13.595098063137375 inh2o
Each inhg carries 3386.38815789 Pa and each inh2o 249.08891 Pa, so one inhg equals 3386.38815789 ÷ 249.08891 inh2o.
Let p(inhg) be pressure in inHg (inhg), and p(inh2o) in inH2O (inh2o). Then:
p(inh2o) = p(inhg) × (3386.38815789 / 249.08891)
Equivalently, divide by how many inhg fit into one inh2o (Pa per inh2o divided by Pa per inhg):
p(inh2o) = p(inhg) ÷ 0.07355592400701136
Examples
Example #1: Convert 1 inhg to inh2o
1 inhg = 1 inhg × (3386.38815789/249.08891) inh2o = 13.5950980631 inh2o
1 inhg = 1 inhg ÷ 0.07355592400701136 = 13.5950980631 inh2o
1 inhg × (3,386.38815789/249.08891) = 13.595098 inh2o
Example #2: Convert 10 inhg to inh2o
10 inhg = 10 inhg × (3386.38815789/249.08891) inh2o = 135.950980631 inh2o
10 inhg = 10 inhg ÷ 0.07355592400701136 = 135.950980631 inh2o
10 inhg × (3,386.38815789/249.08891) = 135.950981 inh2o
Summary
To convert inHg to inH2O, multiply the value in inhg by (3386.38815789 Pa per inhg) / (249.08891 Pa per inh2o). Equivalently: value_inh2o = value_inhg × (3386.38815789 / 249.08891). Numerically, 1 inhg equals 13.595098063137375 inh2o.
Relationship context
Both inHg and inH2O are converted by fixed multiples of the pascal. Multiplying by (Pa per inhg) ÷ (Pa per inh2o) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| inHg (inhg) | inH2O (inh2o) |
|---|---|
| 0.1 | 1.3595098063 |
| 1 | 13.5950980631 |
| 2 | 27.1901961263 |
| 3 | 40.7852941894 |
| 4 | 54.3803922525 |
| 5 | 67.9754903157 |
| 6 | 81.5705883788 |
| 7 | 95.165686442 |
| 8 | 108.760784505 |
| 9 | 122.355882568 |
| inHg (inhg) | inH2O (inh2o) |
|---|---|
| 10 | 135.950980631 |
| 20 | 271.901961263 |
| 30 | 407.852941894 |
| 40 | 543.803922525 |
| 50 | 679.754903157 |
| 60 | 815.705883788 |
| 70 | 951.65686442 |
| 80 | 1,087.60784505 |
| 90 | 1,223.55882568 |
| 100 | 1,359.50980631 |