STRUCTURAL
Pressure & stress
Pressure, material stress and fluid head.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result0.0000967841 atm1 mmH₂O = 0.0000967841 atm
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mmH₂O to atm Converter
Convert millimetre of water, conventional (mmH₂O) to standard atmosphere (atm). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through pascal
Enter a millimetre of water, conventional value to calculate standard atmosphere with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| pascalfrom mmH₂O | Pa | 9.80665 |
| hectopascalfrom mmH₂O | hPa | 0.0980665 |
| kilopascalfrom mmH₂O | kPa | 0.00980665 |
| megapascalfrom mmH₂O | MPa | 0.00000980665 |
| gigapascalfrom mmH₂O | GPa | 0.00000000980665 |
| millibarfrom mmH₂O | mbar | 0.0980665 |
| barfrom mmH₂O | bar | 0.0000980665 |
| standard atmospherefrom mmH₂O | atm | 0.0000967841 |
| torrfrom mmH₂O | Torr | 0.0735559 |
| millimetre of mercuryfrom mmH₂O | mmHg | 0.0735559 |
| inch of mercury, conventionalfrom mmH₂O | inHg | 0.0028959 |
| millimetre of water, conventionalfrom mmH₂O | mmH₂O | 1 |
| inch of water, conventionalfrom mmH₂O | inH₂O | 0.0393701 |
| pound-force per square footfrom mmH₂O | psf | 0.204816 |
| pound-force per square inchfrom mmH₂O | psi | 0.00142233 |
| kilopound-force per square inchfrom mmH₂O | ksi | 0.00000142233 |
| kilogram-force per square centimetrefrom mmH₂O | kgf/cm² | 0.0001 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
mmH₂O to atm Conversion Reference
Millimetre Of Water, Conventional (mmH₂O) and standard atmosphere (atm) are units of pressure & stress. Use this page to convert in either direction.
Conversion Examples
| Millimetre Of Water, Conventional (mmH₂O) | Standard Atmosphere (atm) |
|---|---|
| 1 mmH₂O | 0.0000967841 atm |
| 5 mmH₂O | 0.000483921 atm |
| 10 mmH₂O | 0.000967841 atm |
| 100 mmH₂O | 0.00967841 atm |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
atm to mmH₂O (standard atmosphere to millimetre of water, conventional)
Related Pressure & stress Conversions
mmH₂O to Pa (millimetre of water, conventional to pascal)mmH₂O to hPa (millimetre of water, conventional to hectopascal)mmH₂O to kPa (millimetre of water, conventional to kilopascal)mmH₂O to MPa (millimetre of water, conventional to megapascal)mmH₂O to GPa (millimetre of water, conventional to gigapascal)mmH₂O to mbar (millimetre of water, conventional to millibar)mmH₂O to bar (millimetre of water, conventional to bar)mmH₂O to Torr (millimetre of water, conventional to torr)mmH₂O to mmHg (millimetre of water, conventional to millimetre of mercury)mmH₂O to inHg (millimetre of water, conventional to inch of mercury, conventional)mmH₂O to inH₂O (millimetre of water, conventional to inch of water, conventional)mmH₂O to psf (millimetre of water, conventional to pound-force per square foot)mmH₂O to psi (millimetre of water, conventional to pound-force per square inch)mmH₂O to ksi (millimetre of water, conventional to kilopound-force per square inch)mmH₂O to kgf/cm² (millimetre of water, conventional to kilogram-force per square centimetre)