inH2O to Torr Converter
Pressure · unit-converter
Convert inH2O to Torr 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 Torr
The torr is defined as 1/760 of a standard atmosphere (≈133.32236842105263 Pa). It is widely used in vacuum science alongside pascal.
How to convert inch of water (inh2o, 4 °c) to torr
1 inh2o equals 1.868320469775475 torr in this tool (via pascal):
1 inh2o = (249.08891 Pa ÷ 133.32236842105263 Pa) torr = 1.868320469775475 torr
Each inh2o carries 249.08891 Pa and each torr 133.32236842105263 Pa, so one inh2o equals 249.08891 ÷ 133.32236842105263 torr.
Let p(inh2o) be pressure in inH2O (inh2o), and p(torr) in Torr (torr). Then:
p(torr) = p(inh2o) × (249.08891 / 133.32236842105263)
Equivalently, divide by how many inh2o fit into one torr (Pa per torr divided by Pa per inh2o):
p(torr) = p(inh2o) ÷ 0.5352400812266296
Examples
Example #1: Convert 1 inh2o to torr
1 inh2o = 1 inh2o × (249.08891/133.32236842105263) torr = 1.8683204698 torr
1 inh2o = 1 inh2o ÷ 0.5352400812266296 = 1.8683204698 torr
1 inh2o × (249.08891/133.32236842105263) = 1.868320 torr
Example #2: Convert 10 inh2o to torr
10 inh2o = 10 inh2o × (249.08891/133.32236842105263) torr = 18.6832046978 torr
10 inh2o = 10 inh2o ÷ 0.5352400812266296 = 18.6832046978 torr
10 inh2o × (249.08891/133.32236842105263) = 18.683205 torr
Summary
To convert inH2O to Torr, multiply the value in inh2o by (249.08891 Pa per inh2o) / (133.32236842105263 Pa per torr). Equivalently: value_torr = value_inh2o × (249.08891 / 133.32236842105263). Numerically, 1 inh2o equals 1.868320469775475 torr.
Relationship context
Both inH2O and Torr are converted by fixed multiples of the pascal. Multiplying by (Pa per inh2o) ÷ (Pa per torr) 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) | Torr (torr) |
|---|---|
| 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) | Torr (torr) |
|---|---|
| 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 |