Convert inches of mercury to millimeters of mercury
1 inHg = 25.4 mmHg. Change the amount below, or read the formula and the reference table further down.
1 inch of mercury equals
millimeters of mercury
1 inHg = 25.4 mmHg
The formula
Inches of mercury and millimeters of mercury both measure pressure from the same zero, so a single multiplier does the job.
mmHg = inHg × 25.4
Going the other way? Convert millimeters of mercury to inches of mercury.
Inches of mercury to millimeters of mercury table
Common values, rounded for reading.
| Inches of mercury (inHg) | Millimeters of mercury (mmHg) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
| 7 | 177.8 |
| 8 | 203.2 |
| 9 | 228.6 |
| 10 | 254 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 30 | 762 |
| 40 | 1,016 |
| 50 | 1,270 |
| 75 | 1,905 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1,000 | 25,400 |
Questions people ask
- How many millimeters of mercury are in a inch of mercury?
- One inch of mercury equals 25.4 millimeters of mercury.
- How do I convert inches of mercury to millimeters of mercury by hand?
- Multiply the number of inches of mercury by 25.4. For a rough check, 25.4 is close enough for most everyday use.
- What is 1 inch of mercury in millimeters of mercury?
- 1 inch of mercury is 25.4 millimeters of mercury.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.