Standard Atmospheres to Millimeters of Mercury Converter
1 standard atmosphere ≈ 759.99982 millimeters of mercury
Almost identical to the torr, but defined separately. This uses conventional mmHg, not a temperature-specific mercury-column realization.
1 standard atmosphere equals 760 millimeters of mercury
How to convert standard atmospheres to millimeters of mercury
Unit conversion preserves the pressure reference. Gauge pressure and absolute pressure are different readings; changing between them also needs the ambient pressure. Mercury and water-column units use the conventions stated in their unit notes.
mmHg = atm × 759.99982One standard atmosphere is 759.99982 millimeters of mercury, so a single multiplication converts any value.
7,600 mmHg ≈ 10 × 759.99982Almost identical to the torr, but defined separately. This uses conventional mmHg, not a temperature-specific mercury-column realization.
Standard atmospheres to millimeters of mercury conversion table
Common values in standard atmospheres, converted to millimeters of mercury.
| Standard atmospheres (atm) | Millimeters of mercury (mmHg) |
|---|---|
| 1 | 759.99982 |
| 2 | 1,519.9996 |
| 3 | 2,279.9995 |
| 4 | 3,039.9993 |
| 5 | 3,799.9991 |
| 10 | 7,599.9982 |
| 20 | 15,199.996 |
| 25 | 18,999.995 |
| 50 | 37,999.991 |
| 100 | 75,999.982 |
| 250 | 189,999.95 |
| 500 | 379,999.91 |
| 1,000 | 759,999.82 |
About these units
standard atmosphereatm
Exactly 101,325 pascals, the defined standard sea-level pressure.
Reference: CGPM 1954.
millimeter of mercurymmHg
The conventional millimetre of mercury: 133.3224 Pa, following the NIST SP 811 convention.
Reference: NIST Special Publication 811.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.