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

How many inches of water in 1 atm?
The answer is 406.7825046.

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 0.00401463078662 inches of water, or 9.86923169314E-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.

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

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