Hectopascal to mmH2O Converter
Pressure · unit-converter
Convert Hectopascal to mmH2O 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 Hectopascal
The hectopascal (hPa) equals 100 Pa. Meteorologists use hPa for surface charts; 1 hPa equals 1 millibar.
About mmH2O
Millimeters of water column (mmH2O) is used for very low differential pressure in instrumentation and ventilation.
How to convert hectopascal (hpa) to millimeter of water (mmh2o, 4 °c)
1 hectopascal equals 10.197162129779283 mmh2o in this tool (via pascal):
1 hpa = (100 Pa ÷ 9.80665 Pa) mmh2o = 10.197162129779283 mmh2o
Each hectopascal carries 100 Pa and each mmh2o 9.80665 Pa, so one hpa equals 100 ÷ 9.80665 mmh2o.
Let p(hpa) be pressure in Hectopascal (hpa), and p(mmh2o) in mmH2O (mmh2o). Then:
p(mmh2o) = p(hpa) × (100 / 9.80665)
Equivalently, divide by how many hpa fit into one mmh2o (Pa per mmh2o divided by Pa per hpa):
p(mmh2o) = p(hpa) ÷ 0.0980665
Examples
Example #1: Convert 1 hpa to mmh2o
1 hpa = 1 hpa × (100/9.80665) mmh2o = 10.1971621298 mmh2o
1 hpa = 1 hpa ÷ 0.0980665 = 10.1971621298 mmh2o
1 hpa × (100/9.80665) = 10.197162 mmh2o
Example #2: Convert 10 hpa to mmh2o
10 hpa = 10 hpa × (100/9.80665) mmh2o = 101.971621298 mmh2o
10 hpa = 10 hpa ÷ 0.0980665 = 101.971621298 mmh2o
10 hpa × (100/9.80665) = 101.971621 mmh2o
Summary
To convert Hectopascal to mmH2O, multiply the value in hpa by (100 Pa per hpa) / (9.80665 Pa per mmh2o). Equivalently: value_mmh2o = value_hpa × (100 / 9.80665). Numerically, 1 hpa equals 10.197162129779283 mmh2o.
Relationship context
Both Hectopascal and mmH2O are converted by fixed multiples of the pascal. Multiplying by (Pa per hpa) ÷ (Pa per mmh2o) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| Hectopascal (hpa) | mmH2O (mmh2o) |
|---|---|
| 0.1 | 1.019716213 |
| 1 | 10.1971621298 |
| 2 | 20.3943242596 |
| 3 | 30.5914863893 |
| 4 | 40.7886485191 |
| 5 | 50.9858106489 |
| 6 | 61.1829727787 |
| 7 | 71.3801349085 |
| 8 | 81.5772970382 |
| 9 | 91.774459168 |
| Hectopascal (hpa) | mmH2O (mmh2o) |
|---|---|
| 10 | 101.971621298 |
| 20 | 203.943242596 |
| 30 | 305.914863893 |
| 40 | 407.886485191 |
| 50 | 509.858106489 |
| 60 | 611.829727787 |
| 70 | 713.801349085 |
| 80 | 815.772970382 |
| 90 | 917.74459168 |
| 100 | 1,019.71621298 |