inH2O to mmHg Converter
Pressure · unit-converter
Convert inH2O to mmHg 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 mmHg
Millimeters of mercury (mmHg) is common in medicine (e.g. blood pressure). Here it uses the same Pa per unit as torr (133.32236842105263 Pa).
How to convert inch of water (inh2o, 4 °c) to millimeter of mercury (mmhg)
1 inh2o equals 1.868320469775475 mmhg in this tool (via pascal):
1 inh2o = (249.08891 Pa ÷ 133.32236842105263 Pa) mmhg = 1.868320469775475 mmhg
Each inh2o carries 249.08891 Pa and each mmhg 133.32236842105263 Pa, so one inh2o equals 249.08891 ÷ 133.32236842105263 mmhg.
Let p(inh2o) be pressure in inH2O (inh2o), and p(mmhg) in mmHg (mmhg). Then:
p(mmhg) = p(inh2o) × (249.08891 / 133.32236842105263)
Equivalently, divide by how many inh2o fit into one mmhg (Pa per mmhg divided by Pa per inh2o):
p(mmhg) = p(inh2o) ÷ 0.5352400812266296
Examples
Example #1: Convert 1 inh2o to mmhg
1 inh2o = 1 inh2o × (249.08891/133.32236842105263) mmhg = 1.8683204698 mmhg
1 inh2o = 1 inh2o ÷ 0.5352400812266296 = 1.8683204698 mmhg
1 inh2o × (249.08891/133.32236842105263) = 1.868320 mmhg
Example #2: Convert 10 inh2o to mmhg
10 inh2o = 10 inh2o × (249.08891/133.32236842105263) mmhg = 18.6832046978 mmhg
10 inh2o = 10 inh2o ÷ 0.5352400812266296 = 18.6832046978 mmhg
10 inh2o × (249.08891/133.32236842105263) = 18.683205 mmhg
Summary
To convert inH2O to mmHg, multiply the value in inh2o by (249.08891 Pa per inh2o) / (133.32236842105263 Pa per mmhg). Equivalently: value_mmhg = value_inh2o × (249.08891 / 133.32236842105263). Numerically, 1 inh2o equals 1.868320469775475 mmhg.
Relationship context
Both inH2O and mmHg are converted by fixed multiples of the pascal. Multiplying by (Pa per inh2o) ÷ (Pa per mmhg) 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) | mmHg (mmhg) |
|---|---|
| 0.1 | 0.186832047 |
| 1 | 1.8683204698 |
| 2 | 3.7366409395 |
| 3 | 5.6049614093 |
| 4 | 7.4732818791 |
| 5 | 9.3416023489 |
| 6 | 11.2099228187 |
| 7 | 13.0782432884 |
| 8 | 14.9465637582 |
| 9 | 16.814884228 |
| inH2O (inh2o) | mmHg (mmhg) |
|---|---|
| 10 | 18.6832046978 |
| 20 | 37.3664093955 |
| 30 | 56.0496140933 |
| 40 | 74.732818791 |
| 50 | 93.4160234888 |
| 60 | 112.099228187 |
| 70 | 130.782432884 |
| 80 | 149.465637582 |
| 90 | 168.14884228 |
| 100 | 186.832046978 |