Inches of Water to Torr
Convert inches of water to torr instantly. 1 inH2O = 1.8683203948 Torr. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert inches of water to torr
To convert inches of water to torr, multiply by 1.8683203948. 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.
Torr = inH2O × 1.8683203948
Inches of Water to Torr conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Inches of Water | Torr |
|---|---|
| 1 inH2O | 1.86832 Torr |
| 2 inH2O | 3.736641 Torr |
| 3 inH2O | 5.604961 Torr |
| 5 inH2O | 9.341602 Torr |
| 10 inH2O | 18.683204 Torr |
| 20 inH2O | 37.366408 Torr |
| 25 inH2O | 46.70801 Torr |
| 50 inH2O | 93.41602 Torr |
| 100 inH2O | 186.832039 Torr |
| 500 inH2O | 934.160197 Torr |
| 1,000 inH2O | 1,868.32 Torr |
What is a inches of water?
A low-pressure unit used for ventilation and gas appliances.
What is a torr?
One 760th of an atmosphere, near-identical to a millimetre of mercury.
The formula
Torr = inH2O × 1.8683203948
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 Torr
- Type the number of inches of water you want to convert.
- Read the result in torr 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 torr to inches of water page.
Inches of Water to Torr — frequently asked questions
How many torr are in a inches of water?
One inches of water equals 1.8683203948 Torr. Torr = inH2O × 1.8683203948
What is the formula to convert inches of water to torr?
The formula is Torr = inH2O × 1.8683203948. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert torr back to inches of water?
Divide instead of multiplying: one torr is 0.5352401027 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 torr 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 torr.
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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