inH2O to Kilopascal Converter
Pressure · unit-converter
Convert inH2O to Kilopascal 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 Kilopascal
The kilopascal (kPa) equals 1,000 Pa. It appears in HVAC, building science, and many technical specifications.
How to convert inch of water (inh2o, 4 °c) to kilopascal
1 inh2o equals 0.24908891 kilopascal in this tool (via pascal):
1 inh2o = (249.08891 Pa ÷ 1000 Pa) kpa = 0.24908891 kpa
Each inh2o carries 249.08891 Pa and each kilopascal 1000 Pa, so one inh2o equals 249.08891 ÷ 1000 kpa.
Let p(inh2o) be pressure in inH2O (inh2o), and p(kpa) in Kilopascal (kpa). Then:
p(kpa) = p(inh2o) × (249.08891 / 1000)
Equivalently, divide by how many inh2o fit into one kpa (Pa per kpa divided by Pa per inh2o):
p(kpa) = p(inh2o) ÷ 4.014630759755623
Examples
Example #1: Convert 1 inh2o to kilopascal
1 inh2o = 1 inh2o × (249.08891/1000) kpa = 0.24908891 kpa
1 inh2o = 1 inh2o ÷ 4.014630759755623 = 0.24908891 kpa
1 inh2o × (249.08891/1,000) = 0.249089 kpa
Example #2: Convert 10 inh2o to kilopascal
10 inh2o = 10 inh2o × (249.08891/1000) kpa = 2.4908891 kpa
10 inh2o = 10 inh2o ÷ 4.014630759755623 = 2.4908891 kpa
10 inh2o × (249.08891/1,000) = 2.490889 kpa
Summary
To convert inH2O to Kilopascal, multiply the value in inh2o by (249.08891 Pa per inh2o) / (1000 Pa per kpa). Equivalently: value_kpa = value_inh2o × (249.08891 / 1000). Numerically, 1 inh2o equals 0.24908891 kpa.
Relationship context
Both inH2O and Kilopascal are converted by fixed multiples of the pascal. Multiplying by (Pa per inh2o) ÷ (Pa per kpa) 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) | Kilopascal (kpa) |
|---|---|
| 0.1 | 0.024908891 |
| 1 | 0.24908891 |
| 2 | 0.49817782 |
| 3 | 0.74726673 |
| 4 | 0.99635564 |
| 5 | 1.24544455 |
| 6 | 1.49453346 |
| 7 | 1.74362237 |
| 8 | 1.99271128 |
| 9 | 2.24180019 |
| inH2O (inh2o) | Kilopascal (kpa) |
|---|---|
| 10 | 2.4908891 |
| 20 | 4.9817782 |
| 30 | 7.4726673 |
| 40 | 9.9635564 |
| 50 | 12.4544455 |
| 60 | 14.9453346 |
| 70 | 17.4362237 |
| 80 | 19.9271128 |
| 90 | 22.4180019 |
| 100 | 24.908891 |