Inches of Water to mmHg
Convert inches of water to mmhg instantly. 1 inH2O = 1.8683201286 mmHg. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert inches of water to mmhg
To convert inches of water to mmhg, multiply by 1.8683201286. 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.
mmHg = inH2O × 1.8683201286
Inches of Water to mmHg conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Inches of Water | mmHg |
|---|---|
| 1 inH2O | 1.86832 mmHg |
| 2 inH2O | 3.73664 mmHg |
| 3 inH2O | 5.60496 mmHg |
| 5 inH2O | 9.341601 mmHg |
| 10 inH2O | 18.683201 mmHg |
| 20 inH2O | 37.366403 mmHg |
| 25 inH2O | 46.708003 mmHg |
| 50 inH2O | 93.416006 mmHg |
| 100 inH2O | 186.832013 mmHg |
| 500 inH2O | 934.160064 mmHg |
| 1,000 inH2O | 1,868.32 mmHg |
What is a inches of water?
A low-pressure unit used for ventilation and gas appliances.
What is a mmhg?
Millimetres of mercury, still the clinical unit for blood pressure.
The formula
mmHg = inH2O × 1.8683201286
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 Inches of Water to mmHg
- Type the number of inches of water you want to convert.
- Read the result in mmhg 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 mmhg to inches of water page.
Inches of Water to mmHg — frequently asked questions
How many mmhg are in a inches of water?
One inches of water equals 1.8683201286 mmHg. mmHg = inH2O × 1.8683201286
What is the formula to convert inches of water to mmhg?
The formula is mmHg = inH2O × 1.8683201286. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert mmhg back to inches of water?
Divide instead of multiplying: one mmhg is 0.535240179 inH2O. 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 inches of water to mmhg 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 inches of water to mmhg.
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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