mmHg to inH2O Converter
Pressure · unit-converter
Convert mmHg 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 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).
About inH2O
Inches of water column (inH2O) is common in low-pressure HVAC and duct static-pressure measurements.
How to convert millimeter of mercury (mmhg) to inch of water (inh2o, 4 °c)
1 mmhg equals 0.5352400812266296 inh2o in this tool (via pascal):
1 mmhg = (133.32236842105263 Pa ÷ 249.08891 Pa) inh2o = 0.5352400812266296 inh2o
Each mmhg carries 133.32236842105263 Pa and each inh2o 249.08891 Pa, so one mmhg equals 133.32236842105263 ÷ 249.08891 inh2o.
Let p(mmhg) be pressure in mmHg (mmhg), and p(inh2o) in inH2O (inh2o). Then:
p(inh2o) = p(mmhg) × (133.32236842105263 / 249.08891)
Equivalently, divide by how many mmhg fit into one inh2o (Pa per inh2o divided by Pa per mmhg):
p(inh2o) = p(mmhg) ÷ 1.868320469775475
Examples
Example #1: Convert 1 mmhg to inh2o
1 mmhg = 1 mmhg × (133.32236842105263/249.08891) inh2o = 0.5352400812 inh2o
1 mmhg = 1 mmhg ÷ 1.868320469775475 = 0.5352400812 inh2o
1 mmhg × (133.32236842105263/249.08891) = 0.535240 inh2o
Example #2: Convert 10 mmhg to inh2o
10 mmhg = 10 mmhg × (133.32236842105263/249.08891) inh2o = 5.3524008123 inh2o
10 mmhg = 10 mmhg ÷ 1.868320469775475 = 5.3524008123 inh2o
10 mmhg × (133.32236842105263/249.08891) = 5.352401 inh2o
Summary
To convert mmHg to inH2O, multiply the value in mmhg by (133.32236842105263 Pa per mmhg) / (249.08891 Pa per inh2o). Equivalently: value_inh2o = value_mmhg × (133.32236842105263 / 249.08891). Numerically, 1 mmhg equals 0.5352400812266296 inh2o.
Relationship context
Both mmHg and inH2O are converted by fixed multiples of the pascal. Multiplying by (Pa per mmhg) ÷ (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
| mmHg (mmhg) | inH2O (inh2o) |
|---|---|
| 0.1 | 0.0535240081 |
| 1 | 0.5352400812 |
| 2 | 1.0704801624 |
| 3 | 1.6057202437 |
| 4 | 2.1409603249 |
| 5 | 2.6762004061 |
| 6 | 3.2114404874 |
| 7 | 3.7466805686 |
| 8 | 4.2819206498 |
| 9 | 4.817160731 |
| mmHg (mmhg) | inH2O (inh2o) |
|---|---|
| 10 | 5.3524008123 |
| 20 | 10.7048016245 |
| 30 | 16.0572024368 |
| 40 | 21.4096032491 |
| 50 | 26.7620040613 |
| 60 | 32.1144048736 |
| 70 | 37.4668056859 |
| 80 | 42.8192064981 |
| 90 | 48.1716073104 |
| 100 | 53.5240081227 |