pound-force per square inch to inch of water at 4°C
Convert pound-force per square inch (psi) to inch of water at 4°C (inH₂O). Use an editable pressure converter, conversion formula, and reference table.
1 psi = 27.67990471 inH₂O
Conversion formula
One pound-force per square inch equals 27.67990471 inch of water at 4°C. Multiply your value in pound-force per square inch by this factor to get inch of water at 4°C. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 pound-force per square inch:5 × 27.67990471 = 138.3995236 inH₂O
Conversion table
| pound-force per square inch (psi) | inch of water at 4°C (inH₂O) |
|---|---|
| 0.01 | 0.2767990471 |
| 0.1 | 2.767990471 |
| 1 | 27.67990471 |
| 2 | 55.35980942 |
| 5 | 138.3995236 |
| 10 | 276.7990471 |
| 25 | 691.9976178 |
| 50 | 1,383.995236 |
| 100 | 2,767.990471 |
| 1000 | 27,679.90471 |
About these measurements
Pressure is force per unit of area.
The base reference used here is the pascal. One pound-force per square inch is 6,894.757293 base units; one inch of water at 4°C is 249.08891 base units.
Important distinctions
Gauge and absolute pressures must not be mixed. This converts units without changing the reference pressure.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert psi to inH₂O?
Multiply the quantity in psi by 27.67990471. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the inch of water at 4°C to pound-force per square inch converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
