A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Meter of waters Converter — atm to mH2O
Convert Atmosphere (atm) to Meter of water (mH2O) using the exact conversion factor (1 atmosphere = 10.33227453 meter of water). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Meter of waters converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Meter of water column.
Result = input x 101325 / 9806.65.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Meter of waters
Atmosphere and Meter of water both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Atmosphere is most often used for chemistry (standard conditions are often defined at 1 atm).
Formula
meter of waters = atmospheres × 10.332274528
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 meter of water equals 9806.65 base units, so dividing one by the other gives the direct atmosphere-to-meter of water factor of 10.332274528.
Simple example
1 atm × 10.33227453 = 10.33227453 mH2O
1 atmosphere = 10.33227453 meter of waters.
Real-world example
35 atm × 10.33227453 = 361.6296085 mH2O
35 atmospheres = 361.6296085 meter of waters.
Conversion table
| Atmosphere (atm) | Meter of water (mH2O) |
|---|---|
| 1 atm | 10.33227453 mH2O |
| 5 atm | 51.66137264 mH2O |
| 10 atm | 103.3227453 mH2O |
| 25 atm | 258.3068632 mH2O |
| 50 atm | 516.6137264 mH2O |
| 100 atm | 1,033.227453 mH2O |
Reverse conversion: Meter of water to Atmosphere
10.33227453 mH2O × 0.09678411054 = 1 atm
10.33227453 meter of waters = 1 atmospheres.
atmospheres = meter of waters × 0.0967841105354
For a page dedicated to this direction, see Meter of water to Atmosphere.
Understanding the Atmosphere
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
Where it's used: Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Uses of the Atmosphere today
- Chemistry (standard conditions are often defined at 1 atm)
- Diving and aviation pressure references
- General reference for everyday atmospheric pressure
Understanding the Meter of water (mH2O)
Meter of water column.
Atmosphere — sources
- BIPM SI Brochure — Standard atmosphere listed among non-SI units with a fixed exact value in pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many meter of waters are in 1 atmosphere?
1 atmosphere equals 10.33227453 meter of waters, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to meter of water?
Multiply the atmosphere value by 10.33227453. The converter above does this instantly to whatever precision you set.
How do I convert meter of water back to atmosphere?
Use the reverse factor: 1 meter of water equals 0.0967841105 atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a atmosphere?
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
What is a meter of water?
Meter of water (mH2O) is a unit of pressure.
Is the atmosphere to meter of water conversion exact?
Yes. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the atmosphere still used today?
Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar