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)
0.10.024908891
10.24908891
20.49817782
30.74726673
40.99635564
51.24544455
61.49453346
71.74362237
81.99271128
92.24180019
inH2O (inh2o)Kilopascal (kpa)
102.4908891
204.9817782
307.4726673
409.9635564
5012.4544455
6014.9453346
7017.4362237
8019.9271128
9022.4180019
10024.908891