mmH2O to Torr Converter
Pressure · unit-converter
Convert mmH2O 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 mmH2O
Millimeters of water column (mmH2O) is used for very low differential pressure in instrumentation and ventilation.
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 millimeter of water (mmh2o, 4 °c) to torr
1 mmh2o equals 0.07355592400690845 torr in this tool (via pascal):
1 mmh2o = (9.80665 Pa ÷ 133.32236842105263 Pa) torr = 0.07355592400690845 torr
Each mmh2o carries 9.80665 Pa and each torr 133.32236842105263 Pa, so one mmh2o equals 9.80665 ÷ 133.32236842105263 torr.
Let p(mmh2o) be pressure in mmH2O (mmh2o), and p(torr) in Torr (torr). Then:
p(torr) = p(mmh2o) × (9.80665 / 133.32236842105263)
Equivalently, divide by how many mmh2o fit into one torr (Pa per torr divided by Pa per mmh2o):
p(torr) = p(mmh2o) ÷ 13.595098063156392
Examples
Example #1: Convert 1 mmh2o to torr
1 mmh2o = 1 mmh2o × (9.80665/133.32236842105263) torr = 0.073555924 torr
1 mmh2o = 1 mmh2o ÷ 13.595098063156392 = 0.073555924 torr
1 mmh2o × (9.80665/133.32236842105263) = 0.073556 torr
Example #2: Convert 10 mmh2o to torr
10 mmh2o = 10 mmh2o × (9.80665/133.32236842105263) torr = 0.7355592401 torr
10 mmh2o = 10 mmh2o ÷ 13.595098063156392 = 0.7355592401 torr
10 mmh2o × (9.80665/133.32236842105263) = 0.735559 torr
Summary
To convert mmH2O to Torr, multiply the value in mmh2o by (9.80665 Pa per mmh2o) / (133.32236842105263 Pa per torr). Equivalently: value_torr = value_mmh2o × (9.80665 / 133.32236842105263). Numerically, 1 mmh2o equals 0.07355592400690845 torr.
Relationship context
Both mmH2O and Torr are converted by fixed multiples of the pascal. Multiplying by (Pa per mmh2o) ÷ (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
| mmH2O (mmh2o) | Torr (torr) |
|---|---|
| 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 |
| mmH2O (mmh2o) | Torr (torr) |
|---|---|
| 10 | 0.7355592401 |
| 20 | 1.4711184801 |
| 30 | 2.2066777202 |
| 40 | 2.9422369603 |
| 50 | 3.6777962003 |
| 60 | 4.4133554404 |
| 70 | 5.1489146805 |
| 80 | 5.8844739205 |
| 90 | 6.6200331606 |
| 100 | 7.3555924007 |