Pressure conversion
Pressure is measured and expressed in different units depending on the industry or region. Common units include Pascal (Pa), bar, psi, and mmH₂O. On this page, you’ll find clear explanations and practical pressure conversion tables to quickly convert values and compare specifications of fans, pumps, or other equipment.
How pressure measurement and conversion work
Pressure is defined as the force per unit area and can be represented using various standards:
- Pascal (Pa) is the SI unit for pressure.
- Bar is widely used in industrial applications.
- Psi (pounds per square inch) is common in the US and UK.
- mmH₂O or mmWC (water column) is often used for low pressure ranges, such as in ventilation systems.
Our conversion tables allow you to quickly switch between units and avoid confusion when working with international specifications.
Pressure conversion factors
Below is an overview of the most commonly used units and their conversion factors.
| Abbreviation | Pressure unit |
|---|---|
| Pa | Pascal |
| N/m² | Newton per square metre |
| mmH2O | Millimeter water column |
| mbar | Millibar |
| bar | Bar |
| in H2O | Inch water column |
| ft H2O | Foot water column |
Pressure conversion table
Use this table to convert one pressure unit to another with ease.
| Pressure unit | Pa | N/m² | mmH2O | mbar | bar | in H2O | ft H2O |
|---|---|---|---|---|---|---|---|
| 1 Pa | 1 | 1 | 0.10197 | 0.01 | 0.00001 | 0.0040146 | 0.0003345 |
| 1 N/m² | 1 | 1 | 0.10197 | 0.01 | 0.00001 | 0.0040146 | 0.0003345 |
| 1 mmH2O | 9.8067 | 9.8067 | 1 | 0.098067 | 0.000098067 | 0.03937 | 0.0032808 |
| 1 mbar | 100 | 100 | 10.0197 | 1 | 0.001 | 0.40146 | 0.033455 |
| 1 bar | 100,000 | 100,000 | 10,197 | 1,000 | 1 | 401.46 | 33.455 |
| 1 in H2O | 249.09 | 249.09 | 25.4 | 2.4909 | 0.0024909 | 1 | 0.08333 |
| 1 ft H2O | 2,989.10 | 2,989.10 | 304.8 | 29.891 | 0.029891 | 1 |
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Frequently asked questions about pressure conversion
How many Pascals are in 1 bar?
1 bar equals 100,000 Pa.
How many psi is 1 bar?
1 bar = 14.5038 psi.
Which unit is most commonly used for fans?
For fans and HVAC systems, pressure is often expressed in Pascal or mmH₂O for accurate low-pressure readings.
