mm of water to inches of mercury
Convert mm of water to inch of mercury — instant, free, with the formula shown.
How to convert mm of water to inch of mercury
To convert mm of water to inch of mercury, multiply by 0.0028959:
For example, 10 mmH₂O × 0.002896 = 0.028959 inHg.
mmH₂O to inHg conversion table
| mm of water (mmH₂O) | inches of mercury (inHg) |
|---|---|
| 1 mmH₂O | 0.002896 inHg |
| 2 mmH₂O | 0.005792 inHg |
| 5 mmH₂O | 0.01448 inHg |
| 10 mmH₂O | 0.028959 inHg |
| 25 mmH₂O | 0.072398 inHg |
| 50 mmH₂O | 0.144795 inHg |
| 100 mmH₂O | 0.28959 inHg |
| 250 mmH₂O | 0.723975 inHg |
| 500 mmH₂O | 1.447951 inHg |
| 1000 mmH₂O | 2.895902 inHg |
Other mm of water conversions
Convert to inch of mercury from another unit
mmH₂O to inHg — frequently asked
How many inches of mercury are in 1 mm of water?
1 mm of water = 0.002896 inches of mercury (mmH₂O × 0.002896 = inHg).
What is the formula to convert mm of water to inch of mercury?
Multiply your mm of water value by 0.0028959 to get inch of mercury.
How do I convert 10 mm of water to inches of mercury?
10 mmH₂O = 0.028959 inHg. For 100 mmH₂O the answer is 0.28959 inHg. Use the calculator on this page for any other value.
When to convert mm of water to inch of mercury
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.