Inches of Water (inH₂O)	Centimeters of Water (cmH₂O)
1 inH₂O	2.54 cmH₂O
2 inH₂O	5.08 cmH₂O
5 inH₂O	12.7 cmH₂O
10 inH₂O	25.4 cmH₂O
25 inH₂O	63.5 cmH₂O
50 inH₂O	127 cmH₂O
100 inH₂O	254 cmH₂O
250 inH₂O	635 cmH₂O
500 inH₂O	1270 cmH₂O
1000 inH₂O	2540 cmH₂O

Convert Inches of Water to Centimeters of Water

Convert inches of water to centimeters of water (inH₂O to cmH₂O) with our instant calculator. 1 inH₂O = 2.54 cmH₂O. Includes exact formula and reference tables.

How to Convert Inches of Water to Centimeters of Water (inH₂O to cmH₂O)

1 Inch of Water (inH₂O) is equal to 2.54 Centimeters of Water (cmH₂O). Multiply the inch of water value by 2.54

Quick Answer 1 inH₂O = 2.54 cmH₂O

Formula cmH₂O = inH₂O × 2.54

Inverse Factor 1 cmH₂O = 0.393701 inH₂O

Unit Definitions & Metrology Context

The SI unit of pressure is the pascal (Pa). Standard sea-level atmosphere is defined as 101,325 Pa (1.01325 bar or ~14.696 psi).

About Inches of Water (inH₂O): Inch of Water (inH₂O) is a unit in the Pressure measurement category. It is widely used in hvac duct & fan static pressure. Relative to the pressure base unit, 1 inH₂O equals 249.08891 Pascals (Pa).

About Centimeters of Water (cmH₂O): Centimeter of Water (cmH₂O) is a unit in the Pressure measurement category. It is widely used in cpap & medical respiratory pressure. Relative to the pressure base unit, 1 cmH₂O equals 98.0665 Pascals (Pa).

Need to convert in the opposite direction? Visit our Convert Centimeters of Water to Inches of Water (cmH₂O to inH₂O) calculator (1 cmH₂O = 0.393701 inH₂O).

Step-by-Step Worked Examples (inH₂O to cmH₂O)

Convert 5 Inches of Water to Centimeters of Water: Applying the formula (cmH₂O = inH₂O × 2.54): starting with 5 inH₂O, multiply the inch of water value by 2.54 to get 12.7 cmH₂O.
Convert 10 Inches of Water to Centimeters of Water: Applying the formula (cmH₂O = inH₂O × 2.54): starting with 10 inH₂O, multiply the inch of water value by 2.54 to get 25.4 cmH₂O.
Convert 50 Inches of Water to Centimeters of Water: Applying the formula (cmH₂O = inH₂O × 2.54): starting with 50 inH₂O, multiply the inch of water value by 2.54 to get 127 cmH₂O.

Popular Pressure Conversions

Pound per Square Inch ⇄ Bar

Multiply PSI by ~0.0689476 to convert to bar.

Bar ⇄ Pound per Square Inch

Multiply bar by ~14.5038 to find pressure in pounds per square inch (PSI).

Kilopascal ⇄ Pound per Square Inch

1 PSI equals approximately 6.89476 kilopascals (kPa).

Standard Atmosphere ⇄ Pound per Square Inch

1 standard atmosphere equals approximately 14.6959 PSI.

Frequently Asked Questions

Verified answers and formulas for converting inches of water to centimeters of water.

How many centimeters of water are in 1 inch of water?

There are 2.54 centimeters of water (cmH₂O) in 1 inch of water (inH₂O). Conversely, 1 centimeter of water equals 0.393701 inches of water.

How do you convert inches of water to centimeters of water?

To convert inches of water (inH₂O) to centimeters of water (cmH₂O), use the formula: cmH₂O = inH₂O × 2.54. Multiply the inch of water value by 2.54. For example, 10 inH₂O equals 25.4 cmH₂O.

How do I convert back from centimeters of water to inches of water?

To convert in the reverse direction from centimeters of water (cmH₂O) to inches of water (inH₂O), use the inverse formula: inH₂O = cmH₂O × 0.3937007874. Multiply the centimeter of water value by 0.3937007874 (1 cmH₂O = 0.393701 inH₂O).

What is the difference between inch of water (inH₂O) and centimeter of water (cmH₂O)?

Both inch of water and centimeter of water measure pressure. Inch of Water (inH₂O) is a unit in the Pressure measurement category. It is widely used in hvac duct & fan static pressure. Relative to the pressure base unit, 1 inH₂O equals 249.08891 Pascals (Pa). Centimeter of Water (cmH₂O) is a unit in the Pressure measurement category. It is widely used in cpap & medical respiratory pressure. Relative to the pressure base unit, 1 cmH₂O equals 98.0665 Pascals (Pa).

How many PSI is in 1 bar?

1 bar equals approximately 14.5038 PSI. For car tires, 2.2 bar is roughly 32 PSI.