How to convert hectopascals to inches of mercury
- Take the value in hectopascals.
- Use the formula inches of mercury = hectopascals × 0.02952998016.
- For example, 870 hPa is 25.69 inHg.
About hectopascals and inches of mercury
One hectopascal is 0.02953 inches of mercury, so multiply hPa by 0.02953 to get inHg. Standard sea-level pressure, 1013.25 hPa, is 29.92 inHg, and 1000 hPa is 29.53 inHg.
Weather services and pilots in most countries give pressure in hPa (the same as millibars), while the US and Canada use inches of mercury on barometers, forecasts and altimeter settings. A pilot flying into North America, or a US barometer owner reading a European forecast, needs to switch between them.
Examples
- 870 hPa (the lowest sea-level pressure on record, in Typhoon Tip in 1979) is 25.69 inHg
- 980 hPa (a deep low-pressure system) is 28.94 inHg
- 1,013.25 hPa (standard sea-level pressure) is 29.92 inHg
- 1,040 hPa (a strong high-pressure system) is 30.71 inHg
Hectopascals to inches of mercury chart
| Hectopascals (hPa) | Inches of mercury (inHg) |
|---|---|
| 870 | 25.69 |
| 900 | 26.58 |
| 920 | 27.17 |
| 950 | 28.05 |
| 960 | 28.35 |
| 970 | 28.64 |
| 980 | 28.94 |
| 990 | 29.23 |
| 995 | 29.38 |
| 1,000 | 29.53 |
| Hectopascals (hPa) | Inches of mercury (inHg) |
|---|---|
| 1,005 | 29.68 |
| 1,010 | 29.83 |
| 1,013.25 | 29.92 |
| 1,015 | 29.97 |
| 1,020 | 30.12 |
| 1,025 | 30.27 |
| 1,030 | 30.42 |
| 1,035 | 30.56 |
| 1,040 | 30.71 |
| 1,050 | 31.01 |