psi to mm of water
Convert pound per square inch to mm of water — instant, free, with the formula shown.
How to convert pound per square inch to mm of water
To convert pound per square inch to mm of water, multiply by 703.06957964:
For example, 10 psi × 703.06958 = 7030.695796 mmH₂O.
psi to mmH₂O conversion table
| psi (psi) | mm of water (mmH₂O) |
|---|---|
| 1 psi | 703.06958 mmH₂O |
| 2 psi | 1406.139159 mmH₂O |
| 5 psi | 3515.347898 mmH₂O |
| 10 psi | 7030.695796 mmH₂O |
| 25 psi | 17576.739491 mmH₂O |
| 50 psi | 35153.478982 mmH₂O |
| 100 psi | 70306.957964 mmH₂O |
| 250 psi | 175767.39491 mmH₂O |
| 500 psi | 351534.78982 mmH₂O |
| 1000 psi | 703069.579639 mmH₂O |
Other pound per square inch conversions
Convert to mm of water from another unit
psi to mmH₂O — frequently asked
How many mm of water are in 1 pound per square inch?
1 pound per square inch = 703.06958 mm of water (psi × 703.06958 = mmH₂O).
What is the formula to convert pound per square inch to mm of water?
Multiply your pound per square inch value by 703.06957964 to get mm of water.
How do I convert 10 psi to mm of water?
10 psi = 7030.695796 mmH₂O. For 100 psi the answer is 70306.957964 mmH₂O. Use the calculator on this page for any other value.
When to convert pound per square inch to mm of water
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.