mmHg to Inches of Mercury
Convert mmhg to inches of mercury instantly. 1 mmHg = 0.0393700746 inHg. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert mmhg to inches of mercury
To convert mmhg to inches of mercury, divide by 25.4000026977 (multiply by 0.0393700746). 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.
inHg = mmHg × 0.0393700746
mmHg to Inches of Mercury conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| mmHg | Inches of Mercury |
|---|---|
| 1 mmHg | 0.03937 inHg |
| 2 mmHg | 0.07874 inHg |
| 3 mmHg | 0.11811 inHg |
| 5 mmHg | 0.19685 inHg |
| 10 mmHg | 0.393701 inHg |
| 20 mmHg | 0.787401 inHg |
| 25 mmHg | 0.984252 inHg |
| 50 mmHg | 1.968504 inHg |
| 100 mmHg | 3.937007 inHg |
| 500 mmHg | 19.685037 inHg |
| 1,000 mmHg | 39.370075 inHg |
What is a mmhg?
Millimetres of mercury, still the clinical unit for blood pressure.
What is a inches of mercury?
The aviation altimeter unit: 29.92 inHg is standard sea-level pressure.
The formula
inHg = mmHg × 0.0393700746
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 mmHg to Inches of Mercury
- Type the number of mmhg you want to convert.
- Read the result in inches of mercury 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 mercury to mmhg page.
mmHg to Inches of Mercury — frequently asked questions
How many inches of mercury are in a mmhg?
One mmhg equals 0.0393700746 inHg. inHg = mmHg × 0.0393700746
What is the formula to convert mmhg to inches of mercury?
The formula is inHg = mmHg × 0.0393700746. 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 mercury back to mmhg?
Divide instead of multiplying: one inches of mercury is 25.4000026977 mmHg. 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 mmhg to inches of mercury 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 mmhg to inches of mercury.
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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