mm of water to psi
Convert mm of water to pound per square inch — instant, free, with the formula shown.
How to convert mm of water to pound per square inch
To convert mm of water to pound per square inch, multiply by 0.00142233:
For example, 10 mmH₂O × 0.001422 = 0.014223 psi.
mmH₂O to psi conversion table
| mm of water (mmH₂O) | psi (psi) |
|---|---|
| 1 mmH₂O | 0.001422 psi |
| 2 mmH₂O | 0.002845 psi |
| 5 mmH₂O | 0.007112 psi |
| 10 mmH₂O | 0.014223 psi |
| 25 mmH₂O | 0.035558 psi |
| 50 mmH₂O | 0.071117 psi |
| 100 mmH₂O | 0.142233 psi |
| 250 mmH₂O | 0.355584 psi |
| 500 mmH₂O | 0.711167 psi |
| 1000 mmH₂O | 1.422334 psi |
Other mm of water conversions
Convert to pound per square inch from another unit
mmH₂O to psi — frequently asked
How many psi are in 1 mm of water?
1 mm of water = 0.001422 psi (mmH₂O × 0.001422 = psi).
What is the formula to convert mm of water to pound per square inch?
Multiply your mm of water value by 0.00142233 to get pound per square inch.
How do I convert 10 mm of water to psi?
10 mmH₂O = 0.014223 psi. For 100 mmH₂O the answer is 0.142233 psi. Use the calculator on this page for any other value.
When to convert mm of water to pound per square inch
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.