Meter of water column.
Meter of waters to Atmospheres Converter — mH2O to atm
Convert Meter of water (mH2O) to Atmosphere (atm) using the exact conversion factor (1 meter of water = 0.0967841105 atmosphere). See the formula, worked examples, conversion table, and common uses.
Meter of waters to Atmospheres 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.
A standard atmosphere is exactly 101,325 pascals.
Result = input x 9806.65 / 101325.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Meter of waters to Atmospheres
Meter of water and Atmosphere 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. Specifically: Meter of water column, and a standard atmosphere is exactly 101,325 pascals.
Formula
atmospheres = meter of waters × 0.0967841105354
This factor comes from each unit's defined relationship to the category's base unit: 1 meter of water equals 9806.65 base units, and 1 atmosphere equals 101325 base units, so dividing one by the other gives the direct meter of water-to-atmosphere factor of 0.0967841105354.
Simple example
1 mH2O × 0.09678411054 = 0.0967841105 atm
1 meter of water = 0.0967841105 atmospheres.
Real-world example
35 mH2O × 0.09678411054 = 3.387443869 atm
35 meter of waters = 3.387443869 atmospheres.
Conversion table
| Meter of water (mH2O) | Atmosphere (atm) |
|---|---|
| 1 mH2O | 0.0967841105 atm |
| 5 mH2O | 0.4839205527 atm |
| 10 mH2O | 0.9678411054 atm |
| 25 mH2O | 2.419602763 atm |
| 50 mH2O | 4.839205527 atm |
| 100 mH2O | 9.678411054 atm |
Reverse conversion: Atmosphere to Meter of water
0.0967841105 atm × 10.33227453 = 0.9999999996 mH2O
0.0967841105 atmospheres = 0.9999999996 meter of waters.
meter of waters = atmospheres × 10.332274528
For a page dedicated to this direction, see Atmosphere to Meter of water.
Understanding the Meter of water (mH2O)
Meter of water column.
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
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 atmospheres are in 1 meter of water?
1 meter of water equals 0.0967841105 atmospheres, using the exact defined conversion factor rather than an estimate.
How do I convert meter of water to atmosphere?
Multiply the meter of water value by 0.09678411054. The converter above does this instantly to whatever precision you set.
How do I convert atmosphere back to meter of water?
Use the reverse factor: 1 atmosphere equals 10.33227453 meter of waters. You can also use the swap control in the converter above to flip the direction instantly.
What is a meter of water?
Meter of water (mH2O) is a unit of pressure.
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.
Is the meter of water to atmosphere 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.