mmH2O (4°C) to Pound/sq inch Converter
Convert mmH2O (4°C) (mmH2O) to Pound/sq inch (psi) instantly. 1 mmH2O = 0.001422 psi.
Pressure Converter
29 units available
1 mmH2O = 0.001422 psi
Formula:
psi = mmH2O × 0.0014223343With your value: 1 mmH2O = 0.00142233 psi
Other mmH2O (4°C) to Pound/sq inch conversions
mmH2O (4°C) to Pound/sq inch Conversion Table
| mmH2O (4°C) (mmH2O) | Pound/sq inch (psi) |
|---|---|
| 0.5 | 0.000711 |
| 1 | 0.001422 |
| 2 | 0.002845 |
| 5 | 0.007112 |
| 10 | 0.014223 |
| 15 | 0.021335 |
| 20 | 0.028447 |
| 25 | 0.035558 |
| 50 | 0.071117 |
| 100 | 0.142233 |
| 250 | 0.355584 |
| 500 | 0.711167 |
| 1000 | 1.422334 |
Pound/sq inch to mmH2O (4°C) Conversion Table
| Pound/sq inch (psi) | mmH2O (4°C) (mmH2O) |
|---|---|
| 0.5 | 351.53479 |
| 1 | 703.06958 |
| 2 | 1,406.139159 |
| 5 | 3,515.347898 |
| 10 | 7,030.695796 |
| 15 | 10,546.043695 |
| 20 | 14,061.391593 |
| 25 | 17,576.739491 |
| 50 | 35,153.478982 |
| 100 | 70,306.957964 |
| 250 | 175,767.39491 |
| 500 | 351,534.78982 |
| 1000 | 703,069.579639 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
mmH2O (4°C) (mmH2O)
Pressure
Derived from the pascal (1 Pa = 1 N/m²). The standard atmosphere is exactly 101 325 Pa.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Pound/sq inch (psi)
Pressure
1 psi = 1 lbf/in² = 6894.757 293 168 361 Pa exactly.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert mmH2O (4°C) to Pound/sq inch
To convert from mmH2O (4°C) (mmH2O) to Pound/sq inch (psi), multiply the value by 0.0014223343.
Formula: psi = mmH2O × 0.0014223343
Reverse: mmH2O = psi × 703.0695796391
Step-by-Step Example
- Start with your value in mmH2O (4°C). For example: 5 mmH2O
- Multiply by the conversion factor: 5 x 0.0014223343
- The result is: 0.007112 psi
About mmH2O (4°C)
The mmh2o (4°c) (mmH2O) is a unit of pressure and stress. One mmh2o (4°c) equals 9.80665 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: pressure calculations, engineering and science, education.
About Pound/sq inch
Pounds per square inch (psi) is an imperial unit of pressure widely used in the US for tire pressure, hydraulics, and engineering.
Common uses: tire pressure (US), hydraulics, HVAC.
Frequently Asked Questions
How many Pound/sq inch are in 1 mmH2O (4°C)?
There are exactly 0.0014223343 Pound/sq inch in 1 mmH2O (4°C). This means the conversion factor from mmH2O (4°C) to Pound/sq inch is 0.0014223343.
What is the formula to convert mmH2O (4°C) to Pound/sq inch?
The formula to convert mmH2O (4°C) to Pound/sq inch is: psi = mmH2O × 0.0014223343. For example, to convert 10 mmH2O (4°C) to Pound/sq inch, you would multiply 10 by 0.0014223343.
What is a mmH2O (4°C)?
The mmh2o (4°c) (mmH2O) is a unit of pressure and stress. One mmh2o (4°c) equals 9.80665 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Pound/sq inch?
Pounds per square inch (psi) is an imperial unit of pressure widely used in the US for tire pressure, hydraulics, and engineering.
What are the common uses of mmH2O (4°C)?
The mmH2O (4°C) is commonly used in pressure calculations, engineering and science, education.
Related Pressure Conversions
Cite this page
UnitConvertLab. (2026). mmH2O (4°C) to Pound/sq inch converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/mmh2o-to-psi