1 inch of mercury (inHg) = 25.4 millimeters of mercury (mmHg). To convert, multiply by 25.4: mmHg = inHg × 25.4. For example, 5 inHg = 127 mmHg.
mmHg = inHg × 25.4
Inches of mercury to millimeters of mercury table
| Inches of mercury (inHg) | Millimeters of mercury (mmHg) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1,000 | 25,400 |
The two units
Inch of mercury (inHg). The conventional value at 0 °C; US weather reports give barometric pressure in inHg.
Millimeter of mercury (mmHg). The conventional value, 133.322387415 pascals; blood pressure is measured in mmHg.
Because both units are defined in terms of the same base unit, the factor 25.4 is exact, not a rounded measurement.
Convert inches of mercury to other units
- Inches of mercury to pascals — 1 inHg = 3,386.38864 Pa
- Inches of mercury to kilopascals — 1 inHg = 3.38638864 kPa
- Inches of mercury to bars — 1 inHg = 0.0338638864 bar
- Inches of mercury to pounds per square inch — 1 inHg = 0.4911541475 psi
- Inches of mercury to standard atmospheres — 1 inHg = 0.0334210574 atm
Convert other units to millimeters of mercury
Questions people ask
- How many millimeters of mercury are in a inch of mercury?
- 25.4, exactly.
- How do you convert inches of mercury to millimeters of mercury?
- mmHg = inHg × 25.4. It is the same as dividing by 0.0393700787.
- How do you convert millimeters of mercury back to inches of mercury?
- inHg = mmHg ÷ 25.4. See millimeters of mercury to inches of mercury.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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