inH2O to PSI Converter
Pressure · unit-converter
Convert inH2O to PSI 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 inH2O
Inches of water column (inH2O) is common in low-pressure HVAC and duct static-pressure measurements.
About PSI
Pounds-force per square inch (PSI) is common for tires, hydraulics, and US industrial equipment.
How to convert inch of water (inh2o, 4 °c) to psi
1 inh2o equals 0.03612729200008558 psi in this tool (via pascal):
1 inh2o = (249.08891 Pa ÷ 6894.757293168 Pa) psi = 0.03612729200008558 psi
Each inh2o carries 249.08891 Pa and each psi 6894.757293168 Pa, so one inh2o equals 249.08891 ÷ 6894.757293168 psi.
Let p(inh2o) be pressure in inH2O (inh2o), and p(psi) in PSI (psi). Then:
p(psi) = p(inh2o) × (249.08891 / 6894.757293168)
Equivalently, divide by how many inh2o fit into one psi (Pa per psi divided by Pa per inh2o):
p(psi) = p(inh2o) ÷ 27.67990471020167
Examples
Example #1: Convert 1 inh2o to psi
1 inh2o = 1 inh2o × (249.08891/6894.757293168) psi = 0.036127292 psi
1 inh2o = 1 inh2o ÷ 27.67990471020167 = 0.036127292 psi
1 inh2o × (249.08891/6,894.757293168) = 0.036127 psi
Example #2: Convert 10 inh2o to psi
10 inh2o = 10 inh2o × (249.08891/6894.757293168) psi = 0.36127292 psi
10 inh2o = 10 inh2o ÷ 27.67990471020167 = 0.36127292 psi
10 inh2o × (249.08891/6,894.757293168) = 0.361273 psi
Summary
To convert inH2O to PSI, multiply the value in inh2o by (249.08891 Pa per inh2o) / (6894.757293168 Pa per psi). Equivalently: value_psi = value_inh2o × (249.08891 / 6894.757293168). Numerically, 1 inh2o equals 0.03612729200008558 psi.
Relationship context
Both inH2O and PSI are converted by fixed multiples of the pascal. Multiplying by (Pa per inh2o) ÷ (Pa per psi) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| inH2O (inh2o) | PSI (psi) |
|---|---|
| 0.1 | 0.0036127292 |
| 1 | 0.036127292 |
| 2 | 0.072254584 |
| 3 | 0.108381876 |
| 4 | 0.144509168 |
| 5 | 0.18063646 |
| 6 | 0.216763752 |
| 7 | 0.252891044 |
| 8 | 0.289018336 |
| 9 | 0.325145628 |
| inH2O (inh2o) | PSI (psi) |
|---|---|
| 10 | 0.36127292 |
| 20 | 0.72254584 |
| 30 | 1.08381876 |
| 40 | 1.44509168 |
| 50 | 1.8063646 |
| 60 | 2.16763752 |
| 70 | 2.52891044 |
| 80 | 2.89018336 |
| 90 | 3.25145628 |
| 100 | 3.6127292 |