ftH2O (4°C) to Pound/sq inch Converter
Convert ftH2O (4°C) (ftH2O) to Pound/sq inch (psi) instantly. 1 ftH2O = 0.433528 psi.
Pressure Converter
29 units available
1 ftH2O = 0.433528 psi
Formula:
psi = ftH2O × 0.4335275011With your value: 1 ftH2O = 0.4335275 psi
Other ftH2O (4°C) to Pound/sq inch conversions
ftH2O (4°C) to Pound/sq inch Conversion Table
| ftH2O (4°C) (ftH2O) | Pound/sq inch (psi) |
|---|---|
| 0.5 | 0.216764 |
| 1 | 0.433528 |
| 2 | 0.867055 |
| 5 | 2.167638 |
| 10 | 4.335275 |
| 15 | 6.502913 |
| 20 | 8.67055 |
| 25 | 10.838188 |
| 50 | 21.676375 |
| 100 | 43.35275 |
| 250 | 108.381875 |
| 500 | 216.763751 |
| 1000 | 433.527501 |
Pound/sq inch to ftH2O (4°C) Conversion Table
| Pound/sq inch (psi) | ftH2O (4°C) (ftH2O) |
|---|---|
| 0.5 | 1.153329 |
| 1 | 2.306659 |
| 2 | 4.613317 |
| 5 | 11.533294 |
| 10 | 23.066587 |
| 15 | 34.599881 |
| 20 | 46.133175 |
| 25 | 57.666469 |
| 50 | 115.332937 |
| 100 | 230.665874 |
| 250 | 576.664685 |
| 500 | 1,153.329371 |
| 1000 | 2,306.658741 |
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.
ftH2O (4°C) (ftH2O)
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 ftH2O (4°C) to Pound/sq inch
To convert from ftH2O (4°C) (ftH2O) to Pound/sq inch (psi), multiply the value by 0.4335275011.
Formula: psi = ftH2O × 0.4335275011
Reverse: ftH2O = psi × 2.3066587413
Step-by-Step Example
- Start with your value in ftH2O (4°C). For example: 5 ftH2O
- Multiply by the conversion factor: 5 x 0.4335275011
- The result is: 2.167638 psi
About ftH2O (4°C)
The fth2o (4°c) (ftH2O) is a unit of pressure and stress. One fth2o (4°c) equals 2989.0669 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 ftH2O (4°C)?
There are exactly 0.4335275011 Pound/sq inch in 1 ftH2O (4°C). This means the conversion factor from ftH2O (4°C) to Pound/sq inch is 0.4335275011.
What is the formula to convert ftH2O (4°C) to Pound/sq inch?
The formula to convert ftH2O (4°C) to Pound/sq inch is: psi = ftH2O × 0.4335275011. For example, to convert 10 ftH2O (4°C) to Pound/sq inch, you would multiply 10 by 0.4335275011.
What is a ftH2O (4°C)?
The fth2o (4°c) (ftH2O) is a unit of pressure and stress. One fth2o (4°c) equals 2989.0669 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 ftH2O (4°C)?
The ftH2O (4°C) is commonly used in pressure calculations, engineering and science, education.
Related Pressure Conversions
Cite this page
UnitConvertLab. (2026). ftH2O (4°C) to Pound/sq inch converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/fth2o-to-psi