Convert pressure between mmHg, atm, psi, Pa, and bar by selecting the known and result units, entering one value, and selecting Calculate.
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mm To atm Formula
The following formula is used to calculate the conversion from millimeters of mercury (mmHg) to atmospheres (atm).
ATM ≈ MM / 760
Variables:
- ATM is the pressure in atmospheres
- MM is the pressure in millimeters of mercury
For the usual approximation, divide mmHg by 760. The calculator uses conventional mmHg = 133.322387415 Pa and 1 atm = 101,325 Pa; Torr, which is exactly 1/760 atm, is also available.
| mmHg | atm |
|---|---|
| 1 | 0.001 |
| 5 | 0.007 |
| 10 | 0.013 |
| 20 | 0.026 |
| 50 | 0.066 |
| 75 | 0.099 |
| 100 | 0.132 |
| 120 | 0.158 |
| 200 | 0.263 |
| 250 | 0.329 |
| 300 | 0.395 |
| 400 | 0.526 |
| 500 | 0.658 |
| 600 | 0.789 |
| 700 | 0.921 |
| 720 | 0.947 |
| 740 | 0.974 |
| 760 | 1.000 |
| 800 | 1.053 |
| 1000 | 1.316 |
| *Table values are rounded: atm ≈ mmHg ÷ 760. Exactly 1 atm = 101,325 Pa = 760 Torr = 1.01325 bar; 1 atm ≈ 760 mmHg ≈ 14.696 psi. | |
What Does “mm to atm” Mean?
mm to atm refers to the conversion from millimeters of mercury (mmHg) to atmospheres (atm), which are both units of pressure. The standard atmosphere is defined as exactly 101,325 Pa. Conventional mmHg uses a specified mercury density and standard gravity and is very close to Torr. Dividing mmHg by 760 is a common approximation; the calculator uses the conventional conversion factor. It does not convert gauge pressure to absolute pressure.
How to Calculate mm To atm?
The following steps outline how to calculate the pressure in atmospheres (ATM) from millimeters of mercury (MM) using the formula: ATM ≈ MM / 760.
- First, determine the pressure in millimeters of mercury (MM).
- Next, divide the pressure in millimeters of mercury (MM) by 760.
- Finally, calculate the pressure in atmospheres (ATM).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Pressure in millimeters of mercury (MM) = 570
