mmWC to psi Calculator: Millimeter of Water Column to PSI

Convert millimeter of water column to psi quickly using this online pressure conversion calculator. Enter the pressure value in mmWC or mmH₂O to calculate the equivalent pressure in psi.

1 mmWC ≈ 0.00142233 psi

This calculator is useful for low pressure measurement, differential pressure instruments, HVAC systems, process instrumentation, air handling systems and industrial pressure applications.

mmWC to psi Conversion Calculator

Enter the pressure value in mmWC to calculate the equivalent pressure in psi.

If possible, improve the calculator to show:

Input: mmWC / mmH₂O

Output: psi

Conversion factor: 1 mmWC = 0.00142233 psi

What Is mmWC or mmH2O?

Millimeter of water column is a low pressure unit based on the pressure exerted by a column of water. It is commonly used for relatively low pressure and differential pressure measurements.

In instrumentation and industrial applications, mmWC or mmH₂O may be encountered in differential pressure transmitters, pressure switches, HVAC systems, air handling systems, ventilation systems, gas pressure measurement and low pressure process applications.

What Is PSI?

PSI stands for pounds per square inch and represents pressure as force per unit area. It is commonly used in industrial, mechanical, pneumatic and hydraulic applications.

The relationship between mmWC and psi is:

1 psi ≈ 703.0696 mmWC

1 mmWC ≈ 0.00142233 psi

Pounds per square inch (symbol: psi) is a unit of pressure used in the imperial and US customary systems. It represents the pressure applied by one pound-force over an area of one square inch and is widely used in many industries, especially in hydraulics and pneumatics.

mmWC to psi Conversion Formula

psi = mmWC ÷ 703.0696

Or:

psi = mmWC × 0.00142233

1 mmWC = approximately 0.00142233 psi

Therefore, to convert mmWC to psi, multiply the mmWC value by 0.00142233.

How to Convert mmWC to Psi: Example Calculation

Suppose the pressure is 703.0696 mmWC.

psi = 703.0696 ÷ 703.0696

psi = 1

Therefore, 703.0696 mmWC ≈ 1 psi.

To convert 1000 mmWC to psi:

1000 × 0.00142233 = 1.42233 psi

Therefore, 1000 mmWC ≈ 1.42233 psi.

mmWC to psi Conversion Table

Common mmWC to psi Conversions

What is 1 mmWC in psi?

1 mmWC ≈ 0.00142233 psi.

What is 10 mmWC in psi?

10 mmWC ≈ 0.0142233 psi.

What is 50 mmWC in psi?

50 mmWC ≈ 0.0711167 psi.

What is 100 mmWC in psi?

100 mmWC ≈ 0.142233 psi.

What is 500 mmWC in psi?

500 mmWC ≈ 0.711167 psi.

What is 1000 mmWC in psi?

1000 mmWC ≈ 1.42233 psi.

What is 5000 mmWC in psi?

5000 mmWC ≈ 7.11167 psi.

What is 10000 mmWC in psi?

10000 mmWC ≈ 14.2233 psi.

Is mmWC the Same as mmH2O?

mmWC means millimeter of water column, while mmH₂O means millimeter of water. In pressure conversion and instrumentation applications, these terms are commonly used to represent the same type of water column pressure unit.

psi to mmWC Conversion

To convert psi to mmWC, multiply the pressure value in psi by approximately 703.0696.

mmWC = psi × 703.0696

Example

5 psi to mmWC

5 × 703.0696 = 3515.348 mmWC

Therefore, 5 psi ≈ 3515.35 mmWC.

mmWC to Pascal Conversion

One millimeter of water column is approximately 9.80665 Pa under the standard reference used for the conversion.

Therefore:

Pa = mmWC × 9.80665

For example:

1000 mmWC × 9.80665 = 9806.65 Pa

mmWC to bar Conversion

To convert mmWC to bar, multiply the mmWC value by approximately 0.0000980665.

bar = mmWC × 0.0000980665

Example:

1000 mmWC ≈ 0.0980665 bar

mmWC, Pa, bar and psi Conversion

Example: Converting mmWC During Pressure Transmitter Calibration

Consider a low pressure transmitter with a range of 0 to 1000 mmWC. If a calibration procedure requires applying 50% of range, the reference pressure is:

1000 × 50% = 500 mmWC

Converting to psi:

500 × 0.00142233 = 0.71117 psi

Therefore, 500 mmWC ≈ 0.71117 psi.

Use of mmWC to Psi Conversion Calculator:

• HVAC Systems: Convert mmWC to psi for precise pressure readings in air-conditioning and ventilation systems.
• Process Instrumentation: Helps in converting low-pressure readings from mmWC to psi for system monitoring and control.
• Pneumatics and Hydraulics: Suitable for fluid system pressure conversions between these two units.
• Water Treatment Plants: Ensures accuracy when converting pressure measurements in systems that rely on water column pressure.

This tool is particularly useful for professionals in engineering, process control, and HVAC systems requiring accurate pressure unit conversions.

Does mmWC Measure Gauge or Absolute Pressure?

A water column value can be used to express a pressure difference or gauge pressure depending on the measurement arrangement. The conversion factor between the units does not itself determine whether the pressure is gauge or absolute.

Always identify whether the instrument or calculation uses gauge pressure, absolute pressure or differential pressure before interpreting the result. Conversion resources also distinguish differential pressure from absolute and gauge pressure applications.

Conclusion

The mmWC to psi calculator provides a quick way to convert low pressure and differential pressure values from millimeter of water column to pounds per square inch. The standard relationship is approximately 1 mmWC = 0.00142233 psi.

The conversion is useful when working with HVAC systems, differential pressure transmitters, low pressure instruments, calibration equipment and process control applications. Always verify the pressure reference and engineering unit before using the converted value in an instrument or engineering calculation.

Here you can refer more Online Instrumentation Calculators Collections