Millimetres of mercury to Standard atmospheres
One millimetre of mercury is 0.00131579 standard atmospheres. Pressure units for tyres, weather and diving. Tyre placards are usually in psi or bar; barometers report in hPa or mmHg.
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1 millimetre of mercury = 0.00131579 standard atmospheres · open this conversion
Formula
standard atmospheres = millimetres of mercury × 0.00131578966
The millimetre of mercury used here is the conventional 133.322387415 Pa, defined from mercury density and standard gravity. It is very slightly larger than the torr, which is defined as exactly 1/760 of an atmosphere — so 760 mmHg is 1.00000014 atm, not exactly 1.
Millimetres of mercury to Standard atmospheres table
| Millimetres of mercury | Standard atmospheres |
|---|---|
| 1 mmHg | 0.00131579 atm |
| 2 mmHg | 0.002631579 atm |
| 5 mmHg | 0.006578948 atm |
| 10 mmHg | 0.0131579 atm |
| 15 mmHg | 0.01973684 atm |
| 20 mmHg | 0.02631579 atm |
| 25 mmHg | 0.03289474 atm |
| 28 mmHg | 0.03684211 atm |
| 30 mmHg | 0.03947369 atm |
| 32 mmHg | 0.04210527 atm |
| 35 mmHg | 0.04605264 atm |
| 40 mmHg | 0.05263159 atm |
| 45 mmHg | 0.05921053 atm |
| 50 mmHg | 0.06578948 atm |
| 60 mmHg | 0.07894738 atm |
| 80 mmHg | 0.1052632 atm |
| 100 mmHg | 0.131579 atm |
| 500 mmHg | 0.6578948 atm |
| 760 mmHg | 1 atm |
| 1,000 mmHg | 1.31579 atm |
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Other pressure conversions
⇄ Standard atmospheres to Millimetres of mercuryMillimetres of mercury to PascalsMillimetres of mercury to KilopascalsMillimetres of mercury to BarMillimetres of mercury to Pounds per square inch
Frequently asked questions
▸How many standard atmospheres are in a millimetre of mercury?
One millimetre of mercury is 0.00131579 standard atmospheres. standard atmospheres = millimetres of mercury × 0.00131578966.
▸How do I convert millimetres of mercury to standard atmospheres?
Multiply the number of millimetres of mercury by 0.00131578966. For example, 10 mmHg × 0.00131578966 = 0.0131579 atm.
▸What is the difference between millimetres of mercury and standard atmospheres?
Millimetre of mercury (mmHg) and Standard atmosphere (atm) both measure pressure. Pressure units for tyres, weather and diving. Tyre placards are usually in psi or bar; barometers report in hPa or mmHg.
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