Calculator
atm → mmHg
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mmHg → atm
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Recent conversions
| # | atm | mmHg | Decimals | Timestamp |
|---|
Unit notes
The millimeter of mercury approximates the pressure exerted by a 1 mm column of mercury. The standard atmosphere is defined as 101325 Pa which is exactly 760 mmHg.
- Exact factor: 1 atm = 760 mmHg.
- Reverse factor: 1 mmHg = 1/760 atm ≈ 0.00131578947 atm.
- Contexts: anesthesia, meteorology, vacuum systems, and physiology.
Quick reference
| atm | mmHg |
|---|---|
| 0.1 | 76 |
| 0.25 | 190 |
| 0.5 | 380 |
| 0.75 | 570 |
| 1 | 760 |
| 1.5 | 1140 |
| 2 | 1520 |
| 2.5 | 1900 |
| 3 | 2280 |
FAQs
By convention 1 atmosphere equals exactly 760 millimeters of mercury. So multiply atm by 760 to get mmHg.
Yes. The fields accept scientific notation and the script parses it correctly for both directions.
It depends on your application. Clinical and lab work often use two to four decimals. You can pick from 0 to 12 using the selector.
The factor 1 atm = 760 mmHg is defined for a standard column of mercury at 0 °C. The definition is exact by convention for the unit symbols used here.
Yes. Edit the mmHg field and the tool will compute atm automatically using the inverse relation atm = mmHg ÷ 760.
The calculations use double precision floating point in your browser. Display rounding is controlled by the decimal selector.
Yes. Use the Export CSV button to download your session history as a CSV file for record keeping.