atmospheres to mm of water
Convert atmosphere to mm of water — instant, free, with the formula shown.
How to convert atmosphere to mm of water
To convert atmosphere to mm of water, multiply by 10332.274528:
For example, 10 atm × 10332.274528 = 103322.74528 mmH₂O.
atm to mmH₂O conversion table
| atmospheres (atm) | mm of water (mmH₂O) |
|---|---|
| 1 atm | 10332.274528 mmH₂O |
| 2 atm | 20664.549056 mmH₂O |
| 5 atm | 51661.37264 mmH₂O |
| 10 atm | 103322.74528 mmH₂O |
| 25 atm | 258306.8632 mmH₂O |
| 50 atm | 516613.7264 mmH₂O |
| 100 atm | 1033227.4528 mmH₂O |
| 250 atm | 2583068.632 mmH₂O |
| 500 atm | 5166137.263999 mmH₂O |
| 1000 atm | 10332274.527999 mmH₂O |
Other atmosphere conversions
Convert to mm of water from another unit
atm to mmH₂O — frequently asked
How many mm of water are in 1 atmosphere?
1 atmosphere = 10332.274528 mm of water (atm × 10332.274528 = mmH₂O).
What is the formula to convert atmosphere to mm of water?
Multiply your atmosphere value by 10332.274528 to get mm of water.
How do I convert 10 atmospheres to mm of water?
10 atm = 103322.74528 mmH₂O. For 100 atm the answer is 1033227.4528 mmH₂O. Use the calculator on this page for any other value.
When to convert atmosphere 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.