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Convert millibars (mbar), also called hectopascals (hPa), to inches of mercury (inHg) and back. Built for barometric charts, aviation altimetry context, and any time you need metric pressure next to US-style mercury inches.
Last updated: April 8, 2026
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Millibars
1,013.25 mbar
Inches Hg
29.9212555797 inHg
Kilopascals
101.325 kPa
Quick facts
Relationship
inHg = mbar × (100 ÷ Pa/inHg)
Relationship
mbar = inHg × (Pa/inHg ÷ 100)
Also shown
kPa = mbar ÷ 10
One thousand millibars:
Input
1,000 mbar
Result
29.529983 inHg
A millibar is 100 pascals; it is also called a hectopascal and is standard on many weather maps. Inches of mercury express pressure as the height of a mercury column. This tool links them using the conventional definition where 1 mmHg = 133.322387415 Pa and 1 inch equals 25.4 mm exactly, so one inch of mercury corresponds to a fixed number of pascals—and therefore to a fixed number of millibars.
Pa per inHg = 25.4 × 133.322387415inHg = (mbar × 100) ÷ (Pa per inHg)mbar = (inHg × (Pa per inHg)) ÷ 100kPa = mbar ÷ 10Standard sea-level pressure is often quoted near 1013.25 mbar or 29.92 inHg—your readings will vary with weather.
| mbar | inHg (approx.) |
|---|---|
| 950 | 28.0535 |
| 1000 | 29.529983 |
| 1013.25 | 29.921256 |
| 1020 | 30.1206 |
| 1050 | 31.0065 |
Need more units at once? Open our pressure converter.
Get Custom Calculator for Your PlatformResult: 980 mbar ≈ 28.9394 inHg
Result: 30.00 inHg ≈ 1015.92 mbar
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