How to convert mmHg to atmospheres
To convert mmHg to atmospheres, multiply by 0.00131578966114. Pressure conversions are used for tire inflation, weather, scuba diving, hydraulics and medical devices.
mmHg to Atmosphere conversion table
| mmHg (mmHg) | Atmosphere (atm) |
|---|---|
| 0.1 mmHg | 0.000131578966114 atm |
| 0.5 mmHg | 0.00065789483057 atm |
| 1 mmHg | 0.00131578966114 atm |
| 2 mmHg | 0.00263157932228 atm |
| 3 mmHg | 0.00394736898342 atm |
| 4 mmHg | 0.00526315864456 atm |
| 5 mmHg | 0.0065789483057 atm |
| 10 mmHg | 0.0131578966114 atm |
| 20 mmHg | 0.0263157932228 atm |
| 25 mmHg | 0.0328947415285 atm |
| 50 mmHg | 0.065789483057 atm |
| 100 mmHg | 0.131578966114 atm |
| 500 mmHg | 0.65789483057 atm |
| 1,000 mmHg | 1.31578966114 atm |
About the units
mmHg (mmHg)
Millimeters of mercury are used for blood pressure and barometric readings (1 mmHg ≈ 133.322 Pa).
Atmosphere (atm)
A standard atmosphere is defined as exactly 101,325 pascals.
How to use this converter
- Type the number of mmHg (mmHg) in the input box.
- The result in atmospheres appears instantly — no button needed.
- See the same value in every other pressure unit just below.
- Use “Swap units” to convert atmospheres back to mmHg.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many atmospheres are in one mmhg?
One mmhg equals 0.00131578966114 atmospheres. 0.00131578966114 is the exact factor used by this converter.
How do I convert mmHg to atmospheres?
Multiply the value in mmHg by 0.00131578966114. To go the other way, multiply atmospheres by 759.999891726.
What is 10 mmHg in atm?
10 mmHg = 0.0131578966114 atm. Also, 5 mmHg = 0.0065789483057 atm and 100 mmHg = 0.131578966114 atm.
What is the difference between a mmhg and a atmosphere?
Millimeters of mercury are used for blood pressure and barometric readings (1 mmHg ≈ 133.322 Pa). A standard atmosphere is defined as exactly 101,325 pascals.
Is this tool free and private?
Yes — the mmHg to Atmosphere is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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