inH2O to inHg Converter
Pressure · unit-converter
Convert inH2O to inHg 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 inH2O
Inches of water column (inH2O) is common in low-pressure HVAC and duct static-pressure measurements.
About inHg
Inches of mercury (inHg) is used in aviation altimetry and vacuum readings in some US contexts.
How to convert inch of water (inh2o, 4 °c) to inch of mercury (inhg)
1 inh2o equals 0.07355592400701136 inhg in this tool (via pascal):
1 inh2o = (249.08891 Pa ÷ 3386.38815789 Pa) inhg = 0.07355592400701136 inhg
Each inh2o carries 249.08891 Pa and each inhg 3386.38815789 Pa, so one inh2o equals 249.08891 ÷ 3386.38815789 inhg.
Let p(inh2o) be pressure in inH2O (inh2o), and p(inhg) in inHg (inhg). Then:
p(inhg) = p(inh2o) × (249.08891 / 3386.38815789)
Equivalently, divide by how many inh2o fit into one inhg (Pa per inhg divided by Pa per inh2o):
p(inhg) = p(inh2o) ÷ 13.595098063137375
Examples
Example #1: Convert 1 inh2o to inhg
1 inh2o = 1 inh2o × (249.08891/3386.38815789) inhg = 0.073555924 inhg
1 inh2o = 1 inh2o ÷ 13.595098063137375 = 0.073555924 inhg
1 inh2o × (249.08891/3,386.38815789) = 0.073556 inhg
Example #2: Convert 10 inh2o to inhg
10 inh2o = 10 inh2o × (249.08891/3386.38815789) inhg = 0.7355592401 inhg
10 inh2o = 10 inh2o ÷ 13.595098063137375 = 0.7355592401 inhg
10 inh2o × (249.08891/3,386.38815789) = 0.735559 inhg
Summary
To convert inH2O to inHg, multiply the value in inh2o by (249.08891 Pa per inh2o) / (3386.38815789 Pa per inhg). Equivalently: value_inhg = value_inh2o × (249.08891 / 3386.38815789). Numerically, 1 inh2o equals 0.07355592400701136 inhg.
Relationship context
Both inH2O and inHg are converted by fixed multiples of the pascal. Multiplying by (Pa per inh2o) ÷ (Pa per inhg) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| inH2O (inh2o) | inHg (inhg) |
|---|---|
| 0.1 | 0.0073555924 |
| 1 | 0.073555924 |
| 2 | 0.147111848 |
| 3 | 0.220667772 |
| 4 | 0.294223696 |
| 5 | 0.36777962 |
| 6 | 0.441335544 |
| 7 | 0.514891468 |
| 8 | 0.5884473921 |
| 9 | 0.6620033161 |
| inH2O (inh2o) | inHg (inhg) |
|---|---|
| 10 | 0.7355592401 |
| 20 | 1.4711184801 |
| 30 | 2.2066777202 |
| 40 | 2.9422369603 |
| 50 | 3.6777962003 |
| 60 | 4.4133554404 |
| 70 | 5.1489146805 |
| 80 | 5.8844739206 |
| 90 | 6.6200331606 |
| 100 | 7.3555924007 |