Hectopascals to inches of mercury
Type a value in hectopascals to see it in inches of mercury straight away, or type in the second box to convert back.
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How to use it
- Type the value in the hectopascals box.
- Read the result in inches of mercury as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
inHg = hPa × 0.0295299833
Multiply the value in hectopascals by 0.0295299833 to get inches of mercury.
Example
To convert 25 hPa to inches of mercury: 25 × 0.0295299833 = 0.73825 inHg.
Conversion table
| Hectopascals (hPa) | Inches of mercury (inHg) |
|---|---|
| 1 | 0.02953 |
| 2 | 0.05906 |
| 3 | 0.0885899 |
| 5 | 0.14765 |
| 10 | 0.2953 |
| 20 | 0.5906 |
| 25 | 0.73825 |
| 50 | 1.4765 |
| 100 | 2.953 |
| 250 | 7.3825 |
| 500 | 14.765 |
| 1,000 | 29.53 |
About the units
- Hectopascal
- Exactly 100 pascals. It is the standard unit in weather reports and equals one millibar.
- Inch of mercury
- The pressure of a one inch mercury column at conventional density and standard gravity, about 3386.389 Pa. Common in aviation and US weather reports.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many inches of mercury are in one hectopascal?
1 hPa = 0.02953 inHg exactly.
How do I convert hectopascals to inches of mercury?
Use inHg = hPa × 0.0295299833. For example, 25 hPa = 0.73825 inHg.
How many hectopascals are in one inch of mercury?
1 inHg = 33.8639 hPa.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured from the surrounding air pressure, while absolute pressure starts from a perfect vacuum. These converters change the unit only, so a gauge reading stays a gauge reading.
Are torr and mmHg the same?
Almost. One torr is 101325/760 Pa, about 133.322368 Pa, and one conventional mmHg is 133.322387 Pa, a difference of less than one part per million. For everyday use you can treat them as equal.