Millibars to Inches Of Mercury
A millibar is one thousandth of a bar, the standard unit meteorologists use for barometric pressure readings. Inches of mercury measure pressure the same way as mmHg but in inches, commonly used for barometric pressure in US weather reports. 1 mbar equals ≈0.02953 inHg, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to pressure, measured here against pressure's base unit (Pa) — every other pressure unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
inHg = mbar × ≈0.02953
mbar = inHg × ≈33.8639
Worked example: 5 mbar × ≈0.02953 = ≈0.14765 inHg.
Conversion table
| Millibar (mbar) | Inch of Mercury (inHg) |
|---|---|
| 1 mbar | ≈0.02953 inHg |
| 2 mbar | ≈0.05906 inHg |
| 3 mbar | ≈0.0885899 inHg |
| 5 mbar | ≈0.14765 inHg |
| 10 mbar | ≈0.2953 inHg |
| 20 mbar | ≈0.5906 inHg |
| 25 mbar | ≈0.73825 inHg |
| 50 mbar | ≈1.4765 inHg |
| 100 mbar | ≈2.953 inHg |
| 250 mbar | ≈7.3825 inHg |
| 500 mbar | ≈14.765 inHg |
| 1,000 mbar | ≈29.53 inHg |
Frequently asked
- How many Inches of Mercury in a millibar?
- 1 mbar equals ≈0.02953 inHg.
- How do I convert Millibars to Inches of Mercury?
- Multiply the value in mbar by ≈0.02953 to get inHg. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Millibar and Inch of Mercury are both defined by a fixed conversion factor to pressure's base unit (Pa), so the result shown is exact to the precision displayed, not an approximation.