mm of water to millibars
Convert mm of water to millibar — instant, free, with the formula shown.
How to convert mm of water to millibar
To convert mm of water to millibar, multiply by 0.0980665:
For example, 10 mmH₂O × 0.098067 = 0.980665 mbar.
mmH₂O to mbar conversion table
| mm of water (mmH₂O) | millibars (mbar) |
|---|---|
| 1 mmH₂O | 0.098067 mbar |
| 2 mmH₂O | 0.196133 mbar |
| 5 mmH₂O | 0.490332 mbar |
| 10 mmH₂O | 0.980665 mbar |
| 25 mmH₂O | 2.451662 mbar |
| 50 mmH₂O | 4.903325 mbar |
| 100 mmH₂O | 9.80665 mbar |
| 250 mmH₂O | 24.516625 mbar |
| 500 mmH₂O | 49.03325 mbar |
| 1000 mmH₂O | 98.0665 mbar |
Other mm of water conversions
Convert to millibar from another unit
mmH₂O to mbar — frequently asked
How many millibars are in 1 mm of water?
1 mm of water = 0.098067 millibars (mmH₂O × 0.098067 = mbar).
What is the formula to convert mm of water to millibar?
Multiply your mm of water value by 0.0980665 to get millibar.
How do I convert 10 mm of water to millibars?
10 mmH₂O = 0.980665 mbar. For 100 mmH₂O the answer is 9.80665 mbar. Use the calculator on this page for any other value.
When to convert mm of water to millibar
Pressure conversion — common questions
What's the difference between bar and psi?
1 bar = 100,000 Pa ≈ 14.504 psi. Bar is metric/SI-friendly; psi is US imperial. Tire pressure in cars is commonly 30–35 psi or ≈ 2.1–2.4 bar.
Is 1 atmosphere the same as 1 bar?
Very close but not identical. 1 atm = 1.01325 bar = 101,325 Pa. 1 bar = 100,000 Pa.
Why is blood pressure in mmHg?
Historically measured with mercury manometers — the pressure that supports a column of mercury that many millimetres tall. 120 mmHg systolic ≈ 16 kPa.