Atmospheres to mmHg Converter
One Atmosphere equals 760 mmHg (1 atm = 760 mmHg). Multiply an Atmosphere value by 760 to get the equivalent in mmHg. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
mmHg = atm × 760
Multiply the Atmosphere value by 760 to get the equivalent value in mmHg.
Example Conversions
1 Atmosphere (atm)
760 mmHg (mmHg)
5 Atmosphere (atm)
3800 mmHg (mmHg)
10 Atmosphere (atm)
7600 mmHg (mmHg)
25 Atmosphere (atm)
19000 mmHg (mmHg)
100 Atmosphere (atm)
76000 mmHg (mmHg)
Conversion Table
| Atmosphere (atm) | mmHg (mmHg) |
|---|---|
| 0.1 | 76 |
| 0.5 | 380 |
| 1 | 760 |
| 2 | 1520 |
| 5 | 3800 |
| 10 | 7600 |
| 25 | 19000 |
| 50 | 38000 |
| 100 | 76000 |
| 250 | 190000 |
| 500 | 380000 |
| 1000 | 760000 |
How to Convert Manually
Use these steps to convert Atmosphere values to mmHg without the calculator.
- Write down the value in Atmosphere (atm) that you want to convert.
- Multiply that value by 760.
- For example, 10 Atmospheres × 760 = 7600 mmHg.
- Label the result as mmHg (mmHg).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Atmosphere and one mmHg.
About Atmosphere and mmHg
The standard atmosphere is defined as exactly 101,325 pascals, mean sea-level air pressure. Chemistry reference conditions and diving depth calculations use atmospheres. The millimeter of mercury is about 133.322 pascals, the height a pressure pushes a mercury column. Blood pressure worldwide is still reported in mmHg. One Atmosphere equals 760 mmHg (1 atm = 760 mmHg). Atmosphere is used in chemistry reference conditions and in diving depth pressure. mmHg is used in blood pressure readings.
Precision and Rounding:Several pressure factors are exact by definition (1 atm = 101,325 Pa; 1 bar = 100,000 Pa) while others, like psi and mmHg, are derived and carry long decimals. Tire and weather readings tolerate whole-number rounding; calibration, medicine, and process engineering need the full factor before rounding.
Use the pressure conversion guide to compare mmHg, mbar, inHg, kPa, Pa, and torr across medical, weather, aviation, vacuum, and engineering work.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Atmospheres equals11400mmHg.
15 atm × 760 = 11400 mmHg
FAQ
How do I convert Atmosphere to mmHg?
Multiply the Atmosphere value by 760 to get the equivalent value in mmHg.
What is the formula for Atmosphere to mmHg?
The formula is mmHg = atm × 760.
How many mmHg are in 1 Atmosphere?
1 Atmosphere equals 760 mmHg.
Can I convert mmHg back to Atmosphere?
Yes. 1 mmHg equals 0.001315789474 Atmospheres, and the related converter can reverse the calculation.
What are common names for Atmosphere and mmHg?
Atmosphere is shown as atm and may also be searched as atmospheres, standard atmosphere. mmHg is shown as mmHg and may also be searched as millimeters of mercury, mm Hg.
Was this page helpful?
Let us know if this converter met your needs.