Bar to Inches of Water
Convert bar to inches of water instantly. 1 bar = 401.4630920928 inH2O. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert bar to inches of water
To convert bar to inches of water, multiply by 401.4630920928. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
inH2O = bar × 401.4630920928
Bar to Inches of Water conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Bar | Inches of Water |
|---|---|
| 1 bar | 401.463092 inH2O |
| 2 bar | 802.926184 inH2O |
| 3 bar | 1,204.39 inH2O |
| 5 bar | 2,007.32 inH2O |
| 10 bar | 4,014.63 inH2O |
| 20 bar | 8,029.26 inH2O |
| 25 bar | 10,036.58 inH2O |
| 50 bar | 20,073.15 inH2O |
| 100 bar | 40,146.31 inH2O |
| 500 bar | 200,731.55 inH2O |
| 1,000 bar | 401,463.09 inH2O |
What is a bar?
Defined as exactly 100 kPa, very close to one atmosphere at sea level.
What is a inches of water?
A low-pressure unit used for ventilation and gas appliances.
The formula
inH2O = bar × 401.4630920928
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Bar to Inches of Water
- Type the number of bar you want to convert.
- Read the result in inches of water straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked inches of water to bar page.
Bar to Inches of Water — frequently asked questions
How many inches of water are in a bar?
One bar equals 401.4630920928 inH2O. inH2O = bar × 401.4630920928
What is the formula to convert bar to inches of water?
The formula is inH2O = bar × 401.4630920928. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert inches of water back to bar?
Divide instead of multiplying: one inches of water is 0.002490889 bar. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this bar to inches of water free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the bar to inches of water.
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- how many inches of water in a bar
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error