Pound/sq inch to mmH2O (4°C) Converter
Convert Pound/sq inch (psi) to mmH2O (4°C) (mmH2O) instantly. 1 psi = 703.06958 mmH2O.
Pressure Converter
29 units available
1 psi = 703.06958 mmH2O
Formula:
mmH2O = psi × 703.0695796391With your value: 1 psi = 703.06957964 mmH2O
Other Pound/sq inch to mmH2O (4°C) conversions
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 |
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 |
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.
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
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
How to Convert Pound/sq inch to mmH2O (4°C)
To convert from Pound/sq inch (psi) to mmH2O (4°C) (mmH2O), multiply the value by 703.0695796391.
Formula: mmH2O = psi × 703.0695796391
Reverse: psi = mmH2O × 0.0014223343
Step-by-Step Example
- Start with your value in Pound/sq inch. For example: 5 psi
- Multiply by the conversion factor: 5 x 703.0695796391
- The result is: 3,515.347898 mmH2O
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.
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.
Frequently Asked Questions
How many mmH2O (4°C) are in 1 Pound/sq inch?
There are exactly 703.0695796391 mmH2O (4°C) in 1 Pound/sq inch. This means the conversion factor from Pound/sq inch to mmH2O (4°C) is 703.0695796391.
What is the formula to convert Pound/sq inch to mmH2O (4°C)?
The formula to convert Pound/sq inch to mmH2O (4°C) is: mmH2O = psi × 703.0695796391. For example, to convert 10 Pound/sq inch to mmH2O (4°C), you would multiply 10 by 703.0695796391.
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 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 are the common uses of Pound/sq inch?
The Pound/sq inch is commonly used in tire pressure (US), hydraulics, HVAC.
Related Pressure Conversions
Cite this page
UnitConvertLab. (2026). Pound/sq inch to mmH2O (4°C) converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/psi-to-mmh2o