mmH2O to Pa Calculator

millimeters of water column (mmH₂O or mmWC) to Pascals (Pa) using the conventional conversion factor 1 mmH₂O = 9.80665 Pa.

Quick Conversion

1 mmH₂O = 9.80665 Pa

Formula:
Pa = mmH₂O × 9.80665

Enter the pressure value in mmH₂O to calculate its equivalent pressure in Pascals.

What is mmH2O?

mmH2O stands for millimeters of water column. It is a pressure unit based on the pressure exerted by a 1 mm high water column under standard conditions. This unit is commonly used for low-pressure measurement in HVAC systems, laboratory work, and instrumentation.

What is Pascal (Pa)?

Pascal (Pa) is the SI unit of pressure. One Pascal is equal to one Newton per square meter (N/m²). It is the standard unit used in scientific, industrial, and engineering pressure calculations.

mmH2O to Pa Formula

The conversion from millimeters of water column to Pascals is straightforward. Multiply the pressure value in mmH₂O by 9.80665.

Pa = mmH₂O × 9.80665

Where:

• Pa = pressure in Pascals
• mmH₂O = pressure in millimeters of water column
• 9.80665 = conventional mmH₂O to Pa conversion factor

mmH2O Conversion Factor

1 mmH₂O = 9.80665 Pa

Therefore:

10 mmH₂O = 98.0665 Pa

50 mmH₂O = 490.3325 Pa

100 mmH₂O = 980.665 Pa

500 mmH₂O = 4903.325 Pa

Pa to mmH2O Formula

To convert Pascals back to millimeters of water column, divide the pressure in Pascals by 9.80665.

mmH₂O = Pa ÷ 9.80665

For example:

980.665 Pa ÷ 9.80665 = 100 mmH₂O

How to Convert mmWC to Pa: Example Calculation

Suppose you have a pressure of 50 mmWC. To convert it to Pa:

50?mmWC×9.80665=490.3325?Pa

Thus, 50 mmWC is equal to approximately 490.33 Pa.

mmH2O to Pa Conversion Table

The following table provides commonly used millimeters of water column to Pascal conversions.

Pa to mmH2O Conversion Table

The reverse conversion is useful when a pressure value is provided in Pascals and needs to be expressed as millimeters of water column.

The formula is:

mmH₂O = Pa ÷ 9.80665

For example, 1000 Pa is approximately 101.972 mmH₂O.

Is mmH2O the Same as mmWC?

mmH₂O and mmWC are commonly used to represent the same type of pressure unit: millimeters of water column.

The terms may appear differently depending on the industry or manufacturer:

• mmH₂O means millimeter of water.
• mmWC means millimeter water column.
• mmWS is another terminology used for millimeter water column.
• inH₂O means inches of water column.

In instrumentation, HVAC, process control, and pressure measurement applications, mmH₂O and mmWC are commonly treated as equivalent when the same reference definition is being used.

For this calculator, the conventional conversion is:

1 mmH₂O = 1 mmWC = 9.80665 Pa

Always check the instrument datasheet, calibration procedure, or applicable standard when high measurement accuracy is required.

mmH2O in Instrumentation and Process Control

Millimeters of water column are widely encountered in instrumentation because many industrial applications involve relatively low differential pressures.

Instrumentation engineers may encounter mmH₂O when working with differential pressure transmitters, HVAC systems, filter monitoring, cleanrooms, furnace draft measurements, air systems, and low pressure applications.

Differential Pressure Transmitters

A DP transmitter may have a range such as 0 to 500 mmH₂O. Converting the upper range value to Pascal gives:

500 × 9.80665 = 4903.325 Pa

Therefore:

500 mmH₂O = 4.903325 kPa

Filter Differential Pressure

Filter and dust collection systems often monitor pressure drop across a filter. The differential pressure may be specified in mmH₂O because the pressure is relatively low.

HVAC Applications

Air handling units, ducts, fans, and ventilation systems commonly use water column units for measuring small pressure differences.

Cleanroom Pressure

Cleanroom pressure differences can also be expressed in mmH₂O. Converting these values to Pascal is useful when documenting measurements using SI units.

Instrument Calibration

During calibration, an instrumentation engineer may need to convert a transmitter range or test pressure between mmH₂O and Pa.

For example:

0 to 1000 mmH₂O

is equivalent to approximately: 0 to 9806.65 Pa or: 0 to 9.80665 kPa

FAQs mmH2O to Pa

What is 1 mmH2O in Pa?

1 mmH₂O equals 9.80665 Pa using the conventional millimeter of water conversion factor.

How do I convert mmH2O to Pa?

Multiply the mmH₂O value by 9.80665. The formula is Pa = mmH₂O × 9.80665.

What is the mmH2O to Pa conversion factor?

The conventional conversion factor is 1 mmH₂O = 9.80665 Pa.

What is 10 mmH2O in Pa?

10 mmH₂O equals 98.0665 Pa.

What is 50 mmH2O in Pa?

50 mmH₂O equals 490.3325 Pa.

What is 100 mmH2O in Pa?

100 mmH₂O equals 980.665 Pa.

What is 500 mmH2O in Pa?

500 mmH₂O equals 4903.325 Pa, or approximately 4.903325 kPa.

Is mmWC the same as mmH2O?

Yes, mmWC and mmH₂O commonly refer to millimeters of water column when the same reference definition is used.

How do I convert Pa to mmH2O?

Divide the pressure in Pascal by 9.80665. The formula is mmH₂O = Pa ÷ 9.80665.

What is 1 Pa in mmH2O?

1 Pa is approximately 0.101972 mmH₂O.

Where is mmH2O used?

mmH₂O is commonly used for low pressure and differential pressure applications, including instrumentation, HVAC, filter monitoring, cleanrooms, and air systems.

This mmH2O to Pa conversion calculator gives a fast and accurate way to convert water column pressure into Pascal for technical and industrial use. For more pressure and instrumentation calculators, explore the related tools on this website.

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