Meter of water column.
Meter of waters to PSI Converter — mH2O to psi
Convert Meter of water (mH2O) to PSI (psi) using the exact conversion factor (1 meter of water = 1.422334331 psi). See the formula, worked examples, conversion table, history, and common uses.
Meter of waters to PSI converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Pounds per square inch.
Result = input x 9806.65 / 6894.757293.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Meter of waters to PSI
Meter of water and PSI both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Meter of water column, and pounds per square inch.
Formula
psi = meter of waters × 1.42233433071
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 psi equals 6894.75729317 base units, so dividing one by the other gives the direct meter of water-to-psi factor of 1.42233433071.
Simple example
1 mH2O × 1.422334331 = 1.422334331 psi
1 meter of water = 1.422334331 psi.
Real-world example
100 mH2O × 1.422334331 = 142.2334331 psi
100 meter of waters = 142.2334331 psi.
Conversion table
| Meter of water (mH2O) | PSI (psi) |
|---|---|
| 1 mH2O | 1.422334331 psi |
| 10 mH2O | 14.22334331 psi |
| 50 mH2O | 71.11671654 psi |
| 100 mH2O | 142.2334331 psi |
| 500 mH2O | 711.1671654 psi |
| 1,000 mH2O | 1,422.334331 psi |
Reverse conversion: PSI to Meter of water
1.422334331 psi × 0.7030695796 = 1 mH2O
1.422334331 psi = 1 meter of waters.
meter of waters = psi × 0.703069579639
For a page dedicated to this direction, see PSI to Meter of water.
Understanding the Meter of water (mH2O)
Meter of water column.
Understanding the PSI
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Where it's used: United States (standard pressure unit for tires, tools, and plumbing)
Uses of the PSI today
- Tire pressure specifications in the US
- Hydraulic and pneumatic system ratings
- Plumbing, compressed-air tools, and industrial equipment ratings
History of the PSI
PSI is a derived unit from the pound-force and the inch, both themselves standardized through English and later international agreements rather than invented as a pressure unit from scratch.
It became the default pressure unit in US engineering as pound-force and inch-based measurement dominated American industry through the 19th and 20th centuries, and it remains in everyday use for tires and tools even as most other measurements in the US context stay imperial.
Historical origin. PSI was not the invention of a single named person; it developed through the process described above.
PSI — sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units — Documents conversion factors for psi and other US customary pressure units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many psi are in 1 meter of water?
1 meter of water equals 1.422334331 psi, using the exact defined conversion factor rather than an estimate.
How do I convert meter of water to psi?
Multiply the meter of water value by 1.422334331. The converter above does this instantly to whatever precision you set.
How do I convert psi back to meter of water?
Use the reverse factor: 1 psi equals 0.7030695796 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 engineering.
What is a psi?
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Is the meter of water to psi conversion exact?
Yes. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.