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inches of water | to |
atmosphere [standard] atmosphere [technical] |

How many inches of water in 1 atm?
The answer is 406.78250460035.

We assume you are converting between **inch of water [4 °C]** and **atmosphere [standard]**.

You can view more details on each measurement unit:

inches of water or
atm

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 0.0040146307866177 inches of water, or 9.8692316931427E-6 atm.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between inches of water and atmospheres.

Type in your own numbers in the form to convert the units!

You can do the reverse unit conversion from atm to inches of water, or enter any two units below:

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