What is 5 millimeters of mercury in centimeters of water?

5 millimeters of mercury equals 6.79755 centimeters of water.

What is 10 millimeters of mercury in centimeters of water?

10 millimeters of mercury equals 13.5951 centimeters of water.

What is 100 millimeters of mercury in centimeters of water?

100 millimeters of mercury equals 135.951 centimeters of water.

How do I convert back from centimeters of water to millimeters of mercury?

Multiply the centimeter of water value by 0.735559. For example, 1 cmH₂O = 0.735559 mmHg.

Is the millimeter of mercury bigger than the centimeter of water?

Yes. 1 millimeter of mercury is larger than 1 centimeter of water — specifically 1.35951 times larger.

Are these conversion factors exact?

The factor is derived directly from the SI definitions of millimeter of mercury and centimeter of water; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

mmHg to cmH₂O Converter

1 mmHg = 1.35951 cmH₂O (millimeter of mercury → centimeter of water)

1 mmHg = 1.35951 cmH₂O

1 millimeter of mercury equals 1.35951 centimeters of water. To convert millimeters of mercury to centimeters of water, multiply the millimeter of mercury value by 1.35951. For quick reference: 1 mmHg = 1.35951 cmH₂O, 5 mmHg = 6.79755 cmH₂O, 10 mmHg = 13.5951 cmH₂O, 100 mmHg = 135.951 cmH₂O.

From

1.35951

FormulaCentimeters of water = Millimeters of mercury × 1.35951

Quick

How to convert millimeters of mercury to centimeters of water

Take your value
Start with your value in millimeters of mercury.
Multiply by 1.35951
Multiply the millimeter of mercury value by 1.35951. This is the exact conversion factor from millimeters of mercury to centimeters of water.
Read the result
The product is your value in centimeters of water. For example, 5 mmHg × 1.35951 = 6.79755 cmH₂O.

Conversion formula

The exact factor from millimeters of mercury to centimeters of water is 1.35951.

Centimeters of water = Millimeters of mercury × 1.35951

Millimeters of mercury to Centimeters of water conversion table

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

Conversion table from millimeters of mercury to centimeters of water
Millimeters of mercury (mmHg)	Centimeters of water (cmH₂O)
0.001 mmHg	0.0013595 cmH₂O
0.01 mmHg	0.013595 cmH₂O
0.1 mmHg	0.13595 cmH₂O
0.5 mmHg	0.67976 cmH₂O
1 mmHg	1.3595 cmH₂O
1.5 mmHg	2.0393 cmH₂O
2 mmHg	2.719 cmH₂O
2.5 mmHg	3.3988 cmH₂O
3 mmHg	4.0785 cmH₂O
4 mmHg	5.438 cmH₂O
5 mmHg	6.7976 cmH₂O
6 mmHg	8.1571 cmH₂O
7 mmHg	9.5166 cmH₂O
8 mmHg	10.876 cmH₂O
9 mmHg	12.236 cmH₂O
10 mmHg	13.595 cmH₂O
14 mmHg	19.033 cmH₂O
15 mmHg	20.393 cmH₂O
20 mmHg	27.19 cmH₂O
25 mmHg	33.988 cmH₂O
30 mmHg	40.785 cmH₂O
32 mmHg	43.504 cmH₂O
35 mmHg	47.583 cmH₂O
40 mmHg	54.38 cmH₂O
50 mmHg	67.976 cmH₂O
60 mmHg	81.571 cmH₂O
75 mmHg	101.96 cmH₂O
80 mmHg	108.76 cmH₂O
100 mmHg	135.95 cmH₂O
101.325 mmHg	137.75 cmH₂O
150 mmHg	203.93 cmH₂O
200 mmHg	271.9 cmH₂O
250 mmHg	339.88 cmH₂O
300 mmHg	407.85 cmH₂O
400 mmHg	543.8 cmH₂O
500 mmHg	679.76 cmH₂O
760 mmHg	1033.2 cmH₂O
1000 mmHg	1359.5 cmH₂O
1013.25 mmHg	1377.5 cmH₂O
2000 mmHg	2719 cmH₂O
5000 mmHg	6797.6 cmH₂O
10000 mmHg	13595 cmH₂O
14.7 mmHg	19.985 cmH₂O
50000 mmHg	67976 cmH₂O
100000 mmHg	135951 cmH₂O
101325 mmHg	137752 cmH₂O
200000 mmHg	271902 cmH₂O
500000 mmHg	679755 cmH₂O
1000000 mmHg	1359510 cmH₂O
10000000 mmHg	13595100 cmH₂O

Real-world reference

Normal blood pressure is around 120/80 mmHg. Atmospheric pressure at sea level is roughly 760 mmHg. In centimeters of water, that gives you: 1 mmHg = 1.35951 cmH₂O, 10 mmHg = 13.5951 cmH₂O, 100 mmHg = 135.951 cmH₂O.

Frequently asked questions

How many centimeters of water are in 1 millimeter of mercury?: 1 millimeter of mercury equals 1.35951 centimeters of water.
How do I convert millimeters of mercury to centimeters of water?: Multiply the millimeter of mercury value by 1.35951. So x mmHg × 1.35951 = the equivalent in cmH₂O.
What is 5 millimeters of mercury in centimeters of water?: 5 millimeters of mercury equals 6.79755 centimeters of water.
What is 10 millimeters of mercury in centimeters of water?: 10 millimeters of mercury equals 13.5951 centimeters of water.
What is 100 millimeters of mercury in centimeters of water?: 100 millimeters of mercury equals 135.951 centimeters of water.
How do I convert back from centimeters of water to millimeters of mercury?: Multiply the centimeter of water value by 0.735559. For example, 1 cmH₂O = 0.735559 mmHg.
Is the millimeter of mercury bigger than the centimeter of water?: Yes. 1 millimeter of mercury is larger than 1 centimeter of water — specifically 1.35951 times larger.
Are these conversion factors exact?: The factor is derived directly from the SI definitions of millimeter of mercury and centimeter of water; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

About the millimeter of mercury and the centimeter of water

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.

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.

Centimeters of water to Millimeters of mercury

cmH₂O → mmHg

Kilopascals to Millimeters of mercury

Bars to Standard atmospheres

bar → atm

Bars to Pounds per square inch

bar → psi