The millibar
The millibar (mbar) equals exactly 100 Pa — identical to the hectopascal (hPa) used in modern meteorology. Weather maps almost universally use mbar/hPa for sea-level pressure isobars.
Millibars to Inches of mercury Converter
1 mbar = 0.02953 inHg (millibar → inch of mercury)
1 mbar = 0.02953 inHg
1 millibar equals 0.02953 inches of mercury. To convert millibars to inches of mercury, multiply the millibar value by 0.02953. For quick reference: 1 mbar = 0.02953 inHg, 5 mbar = 0.14765 inHg, 10 mbar = 0.2953 inHg, 100 mbar = 2.953 inHg.
Formula
Inches of mercury = Millibars × 0.02953Quick
How to convert millibars to inches of mercury
Take your value
Start with your value in millibars.
Multiply by 0.02953
Multiply the millibar value by 0.02953. This is the exact conversion factor from millibars to inches of mercury.
Read the result
The product is your value in inches of mercury. For example, 5 mbar × 0.02953 = 0.14765 inHg.
Conversion formula
The exact factor from millibars to inches of mercury is 0.02953.
Inches of mercury = Millibars × 0.02953
Millibars to Inches of mercury conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Millibars (mbar) | Inches of mercury (inHg) |
|---|---|
| 0.001 mbar | 2.9530 × 10^−5 inHg |
| 0.01 mbar | 0.0002953 inHg |
| 0.1 mbar | 0.002953 inHg |
| 0.5 mbar | 0.014765 inHg |
| 1 mbar | 0.02953 inHg |
| 1.5 mbar | 0.044295 inHg |
| 2 mbar | 0.05906 inHg |
| 2.5 mbar | 0.073825 inHg |
| 3 mbar | 0.08859 inHg |
| 4 mbar | 0.11812 inHg |
| 5 mbar | 0.14765 inHg |
| 6 mbar | 0.17718 inHg |
| 7 mbar | 0.20671 inHg |
| 8 mbar | 0.23624 inHg |
| 9 mbar | 0.26577 inHg |
| 10 mbar | 0.2953 inHg |
| 14 mbar | 0.41342 inHg |
| 15 mbar | 0.44295 inHg |
| 20 mbar | 0.5906 inHg |
| 25 mbar | 0.73825 inHg |
| 30 mbar | 0.8859 inHg |
| 32 mbar | 0.94496 inHg |
| 35 mbar | 1.0335 inHg |
| 40 mbar | 1.1812 inHg |
| 50 mbar | 1.4765 inHg |
| 60 mbar | 1.7718 inHg |
| 75 mbar | 2.2147 inHg |
| 80 mbar | 2.3624 inHg |
| 100 mbar | 2.953 inHg |
| 101.325 mbar | 2.9921 inHg |
| 150 mbar | 4.4295 inHg |
| 200 mbar | 5.906 inHg |
| 250 mbar | 7.3825 inHg |
| 300 mbar | 8.859 inHg |
| 400 mbar | 11.812 inHg |
| 500 mbar | 14.765 inHg |
| 760 mbar | 22.443 inHg |
| 1000 mbar | 29.53 inHg |
| 1013.25 mbar | 29.921 inHg |
| 2000 mbar | 59.06 inHg |
| 5000 mbar | 147.65 inHg |
| 10000 mbar | 295.3 inHg |
| 14.7 mbar | 0.43409 inHg |
| 50000 mbar | 1476.5 inHg |
| 100000 mbar | 2953 inHg |
| 101325 mbar | 2992.1 inHg |
| 200000 mbar | 5906 inHg |
| 500000 mbar | 14765 inHg |
| 1000000 mbar | 29530 inHg |
| 10000000 mbar | 295300 inHg |
Real-world reference
Standard atmospheric pressure is 1,013.25 mbar. A strong hurricane has a central pressure below 950 mbar. In inches of mercury, that gives you: 1 mbar = 0.02953 inHg, 10 mbar = 0.2953 inHg, 100 mbar = 2.953 inHg.
Frequently asked questions
- How many inches of mercury are in 1 millibar?
- 1 millibar equals 0.02953 inches of mercury.
- How do I convert millibars to inches of mercury?
- Multiply the millibar value by 0.02953. So x mbar × 0.02953 = the equivalent in inHg.
- What is 5 millibars in inches of mercury?
- 5 millibars equals 0.14765 inches of mercury.
- What is 10 millibars in inches of mercury?
- 10 millibars equals 0.2953 inches of mercury.
- What is 100 millibars in inches of mercury?
- 100 millibars equals 2.953 inches of mercury.
- How do I convert back from inches of mercury to millibars?
- Multiply the inch of mercury value by 33.8639. For example, 1 inHg = 33.8639 mbar.
- Is the millibar bigger than the inch of mercury?
- No. 1 millibar is smaller than 1 inch of mercury. It takes 33.8639 millibars to equal 1 inch of mercury.
- Are these conversion factors exact?
- The factor is derived directly from the SI definitions of millibar and inch of mercury; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.
About the millibar and the inch of mercury
The inch of mercury
The inch of mercury (inHg) equals 3,386.389 Pa under the NIST SP 811 conventional definition. It is the standard unit for barometric pressure on US weather reports and for altimeter settings in US aviation.