mmH2O to Millibar Converter
Pressure · unit-converter
Convert mmH2O to Millibar 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 mmH2O
Millimeters of water column (mmH2O) is used for very low differential pressure in instrumentation and ventilation.
About Millibar
Millibar (mbar) equals 100 Pa and is numerically identical to hPa. It appears in weather and legacy instrument labels.
How to convert millimeter of water (mmh2o, 4 °c) to millibar (mbar)
1 mmh2o equals 0.0980665 millibar in this tool (via pascal):
1 mmh2o = (9.80665 Pa ÷ 100 Pa) mbar = 0.0980665 mbar
Each mmh2o carries 9.80665 Pa and each millibar 100 Pa, so one mmh2o equals 9.80665 ÷ 100 mbar.
Let p(mmh2o) be pressure in mmH2O (mmh2o), and p(mbar) in Millibar (mbar). Then:
p(mbar) = p(mmh2o) × (9.80665 / 100)
Equivalently, divide by how many mmh2o fit into one mbar (Pa per mbar divided by Pa per mmh2o):
p(mbar) = p(mmh2o) ÷ 10.197162129779283
Examples
Example #1: Convert 1 mmh2o to millibar
1 mmh2o = 1 mmh2o × (9.80665/100) mbar = 0.0980665 mbar
1 mmh2o = 1 mmh2o ÷ 10.197162129779283 = 0.0980665 mbar
1 mmh2o × (9.80665/100) = 0.098067 mbar
Example #2: Convert 10 mmh2o to millibar
10 mmh2o = 10 mmh2o × (9.80665/100) mbar = 0.980665 mbar
10 mmh2o = 10 mmh2o ÷ 10.197162129779283 = 0.980665 mbar
10 mmh2o × (9.80665/100) = 0.980665 mbar
Summary
To convert mmH2O to Millibar, multiply the value in mmh2o by (9.80665 Pa per mmh2o) / (100 Pa per mbar). Equivalently: value_mbar = value_mmh2o × (9.80665 / 100). Numerically, 1 mmh2o equals 0.0980665 mbar.
Relationship context
Both mmH2O and Millibar are converted by fixed multiples of the pascal. Multiplying by (Pa per mmh2o) ÷ (Pa per mbar) gives the same result as passing through pascal, keeping bar, atm, PSI, kPa, hPa, torr, and mmHg consistent on the hub.
Conversion tables
| mmH2O (mmh2o) | Millibar (mbar) |
|---|---|
| 0.1 | 0.00980665 |
| 1 | 0.0980665 |
| 2 | 0.196133 |
| 3 | 0.2941995 |
| 4 | 0.392266 |
| 5 | 0.4903325 |
| 6 | 0.588399 |
| 7 | 0.6864655 |
| 8 | 0.784532 |
| 9 | 0.8825985 |
| mmH2O (mmh2o) | Millibar (mbar) |
|---|---|
| 10 | 0.980665 |
| 20 | 1.96133 |
| 30 | 2.941995 |
| 40 | 3.92266 |
| 50 | 4.903325 |
| 60 | 5.88399 |
| 70 | 6.864655 |
| 80 | 7.84532 |
| 90 | 8.825985 |
| 100 | 9.80665 |