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cmH₂O to mmHg Converter

1 cmH₂O = 0.735559 mmHg (centimeter of water → millimeter of mercury)

1 cmH₂O = 0.735559 mmHg

1 centimeter of water equals 0.735559 millimeters of mercury. To convert centimeters of water to millimeters of mercury, multiply the centimeter of water value by 0.735559. For quick reference: 1 cmH₂O = 0.735559 mmHg, 5 cmH₂O = 3.6778 mmHg, 10 cmH₂O = 7.35559 mmHg, 100 cmH₂O = 73.5559 mmHg.

0.735559
FormulaMillimeters of mercury = Centimeters of water × 0.735559
Quick

How to convert centimeters of water to millimeters of mercury

  1. Take your value

    Start with your value in centimeters of water.

  2. Multiply by 0.735559

    Multiply the centimeter of water value by 0.735559. This is the exact conversion factor from centimeters of water to millimeters of mercury.

  3. Read the result

    The product is your value in millimeters of mercury. For example, 5 cmH₂O × 0.735559 = 3.6778 mmHg.

Conversion formula

The exact factor from centimeters of water to millimeters of mercury is 0.735559.

Millimeters of mercury = Centimeters of water × 0.735559

Centimeters of water to Millimeters of mercury conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from centimeters of water to millimeters of mercury
Centimeters of water (cmH₂O)Millimeters of mercury (mmHg)
0.001 cmH₂O0.00073556 mmHg
0.01 cmH₂O0.0073556 mmHg
0.1 cmH₂O0.073556 mmHg
0.5 cmH₂O0.36778 mmHg
1 cmH₂O0.73556 mmHg
1.5 cmH₂O1.1033 mmHg
2 cmH₂O1.4711 mmHg
2.5 cmH₂O1.8389 mmHg
3 cmH₂O2.2067 mmHg
4 cmH₂O2.9422 mmHg
5 cmH₂O3.6778 mmHg
6 cmH₂O4.4134 mmHg
7 cmH₂O5.1489 mmHg
8 cmH₂O5.8845 mmHg
9 cmH₂O6.62 mmHg
10 cmH₂O7.3556 mmHg
14 cmH₂O10.298 mmHg
15 cmH₂O11.033 mmHg
20 cmH₂O14.711 mmHg
25 cmH₂O18.389 mmHg
30 cmH₂O22.067 mmHg
32 cmH₂O23.538 mmHg
35 cmH₂O25.745 mmHg
40 cmH₂O29.422 mmHg
50 cmH₂O36.778 mmHg
60 cmH₂O44.134 mmHg
75 cmH₂O55.167 mmHg
80 cmH₂O58.845 mmHg
100 cmH₂O73.556 mmHg
101.325 cmH₂O74.531 mmHg
150 cmH₂O110.33 mmHg
200 cmH₂O147.11 mmHg
250 cmH₂O183.89 mmHg
300 cmH₂O220.67 mmHg
400 cmH₂O294.22 mmHg
500 cmH₂O367.78 mmHg
760 cmH₂O559.02 mmHg
1000 cmH₂O735.56 mmHg
1013.25 cmH₂O745.31 mmHg
2000 cmH₂O1471.1 mmHg
5000 cmH₂O3677.8 mmHg
10000 cmH₂O7355.6 mmHg
14.7 cmH₂O10.813 mmHg
50000 cmH₂O36778 mmHg
100000 cmH₂O73556 mmHg
101325 cmH₂O74531 mmHg
200000 cmH₂O147112 mmHg
500000 cmH₂O367780 mmHg
1000000 cmH₂O735559 mmHg
10000000 cmH₂O7355591 mmHg

Real-world reference

Mechanical ventilator settings are commonly expressed in cmH₂O. Central venous pressure is often measured in cmH₂O. In millimeters of mercury, that gives you: 1 cmH₂O = 0.735559 mmHg, 10 cmH₂O = 7.35559 mmHg, 100 cmH₂O = 73.5559 mmHg.

Frequently asked questions

How many millimeters of mercury are in 1 centimeter of water?
1 centimeter of water equals 0.735559 millimeters of mercury.
How do I convert centimeters of water to millimeters of mercury?
Multiply the centimeter of water value by 0.735559. So x cmH₂O × 0.735559 = the equivalent in mmHg.
What is 5 centimeters of water in millimeters of mercury?
5 centimeters of water equals 3.6778 millimeters of mercury.
What is 10 centimeters of water in millimeters of mercury?
10 centimeters of water equals 7.35559 millimeters of mercury.
What is 100 centimeters of water in millimeters of mercury?
100 centimeters of water equals 73.5559 millimeters of mercury.
How do I convert back from millimeters of mercury to centimeters of water?
Multiply the millimeter of mercury value by 1.35951. For example, 1 mmHg = 1.35951 cmH₂O.
Is the centimeter of water bigger than the millimeter of mercury?
No. 1 centimeter of water is smaller than 1 millimeter of mercury. It takes 1.35951 centimeters of water to equal 1 millimeter of mercury.
Are these conversion factors exact?
The factor is derived directly from the SI definitions of centimeter of water and millimeter of mercury; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

About the centimeter of water and the millimeter of mercury

The centimeter of water

The centimeter of water (cmH₂O) equals 98.0665 Pa — the pressure exerted by a 1 cm column of water under standard gravity. It is the standard unit for respiratory and ventilator pressures in medicine, and for low-pressure gas and duct measurements in HVAC.

The millimeter of mercury

The millimeter of mercury (mmHg) equals approximately 133.322 Pa — the pressure exerted by a 1 mm column of mercury under standard gravity. It is the conventional unit for blood pressure worldwide, even in countries that have otherwise gone fully metric.

Related converters

Millimeters of mercury to Centimeters of water
mmHg → cmH₂O
Kilopascals to Pounds per square inch
kPa → psi
Kilopascals to Millimeters of mercury
kPa → mmHg
Bars to Pascals
bar → Pa
Bars to Kilopascals
bar → kPa
Bars to Standard atmospheres
bar → atm

Sources