Millibar to mmH2O Converter
Pressure · unit-converter
Convert Millibar 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 Millibar
Millibar (mbar) equals 100 Pa and is numerically identical to hPa. It appears in weather and legacy instrument labels.
About mmH2O
Millimeters of water column (mmH2O) is used for very low differential pressure in instrumentation and ventilation.
How to convert millibar (mbar) to millimeter of water (mmh2o, 4 °c)
1 millibar equals 10.197162129779283 mmh2o in this tool (via pascal):
1 mbar = (100 Pa ÷ 9.80665 Pa) mmh2o = 10.197162129779283 mmh2o
Each millibar carries 100 Pa and each mmh2o 9.80665 Pa, so one mbar equals 100 ÷ 9.80665 mmh2o.
Let p(mbar) be pressure in Millibar (mbar), and p(mmh2o) in mmH2O (mmh2o). Then:
p(mmh2o) = p(mbar) × (100 / 9.80665)
Equivalently, divide by how many mbar fit into one mmh2o (Pa per mmh2o divided by Pa per mbar):
p(mmh2o) = p(mbar) ÷ 0.0980665
Examples
Example #1: Convert 1 mbar to mmh2o
1 mbar = 1 mbar × (100/9.80665) mmh2o = 10.1971621298 mmh2o
1 mbar = 1 mbar ÷ 0.0980665 = 10.1971621298 mmh2o
1 mbar × (100/9.80665) = 10.197162 mmh2o
Example #2: Convert 10 mbar to mmh2o
10 mbar = 10 mbar × (100/9.80665) mmh2o = 101.971621298 mmh2o
10 mbar = 10 mbar ÷ 0.0980665 = 101.971621298 mmh2o
10 mbar × (100/9.80665) = 101.971621 mmh2o
Summary
To convert Millibar to mmH2O, multiply the value in mbar by (100 Pa per mbar) / (9.80665 Pa per mmh2o). Equivalently: value_mmh2o = value_mbar × (100 / 9.80665). Numerically, 1 mbar equals 10.197162129779283 mmh2o.
Relationship context
Both Millibar and mmH2O are converted by fixed multiples of the pascal. Multiplying by (Pa per mbar) ÷ (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
| Millibar (mbar) | 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 |
| Millibar (mbar) | 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 |