mmH2O to Bar Converter
Pressure · unit-converter
Convert mmH2O to Bar 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 Bar
The bar is 100,000 Pa. It is convenient for industrial and approximate atmospheric pressures (1 bar ≈ 1 atm).
How to convert millimeter of water (mmh2o, 4 °c) to bar
1 mmh2o equals 0.0000980665 bar in this tool (via pascal):
1 mmh2o = (9.80665 Pa ÷ 100000 Pa) bar = 0.0000980665 bar
Each mmh2o carries 9.80665 Pa and each bar 100000 Pa, so one mmh2o equals 9.80665 ÷ 100000 bar.
Let p(mmh2o) be pressure in mmH2O (mmh2o), and p(bar) in Bar (bar). Then:
p(bar) = p(mmh2o) × (9.80665 / 100000)
Equivalently, divide by how many mmh2o fit into one bar (Pa per bar divided by Pa per mmh2o):
p(bar) = p(mmh2o) ÷ 10197.162129779283
Examples
Example #1: Convert 1 mmh2o to bar
1 mmh2o = 1 mmh2o × (9.80665/100000) bar = 0.0000980665 bar
1 mmh2o = 1 mmh2o ÷ 10197.162129779283 = 0.0000980665 bar
1 mmh2o × (9.80665/100,000) = 0.000098 bar
Example #2: Convert 10 mmh2o to bar
10 mmh2o = 10 mmh2o × (9.80665/100000) bar = 0.000980665 bar
10 mmh2o = 10 mmh2o ÷ 10197.162129779283 = 0.000980665 bar
10 mmh2o × (9.80665/100,000) = 0.000981 bar
Summary
To convert mmH2O to Bar, multiply the value in mmh2o by (9.80665 Pa per mmh2o) / (100000 Pa per bar). Equivalently: value_bar = value_mmh2o × (9.80665 / 100000). Numerically, 1 mmh2o equals 0.0000980665 bar.
Relationship context
Both mmH2O and Bar are converted by fixed multiples of the pascal. Multiplying by (Pa per mmh2o) ÷ (Pa per bar) 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) | Bar (bar) |
|---|---|
| 0.1 | 0.0000098067 |
| 1 | 0.0000980665 |
| 2 | 0.000196133 |
| 3 | 0.0002941995 |
| 4 | 0.000392266 |
| 5 | 0.0004903325 |
| 6 | 0.000588399 |
| 7 | 0.0006864655 |
| 8 | 0.000784532 |
| 9 | 0.0008825985 |
| mmH2O (mmh2o) | Bar (bar) |
|---|---|
| 10 | 0.000980665 |
| 20 | 0.00196133 |
| 30 | 0.002941995 |
| 40 | 0.00392266 |
| 50 | 0.004903325 |
| 60 | 0.00588399 |
| 70 | 0.006864655 |
| 80 | 0.00784532 |
| 90 | 0.008825985 |
| 100 | 0.00980665 |