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Pressure

Convert millimeters of mercury to millibars

1 mmHg=1.33322mbar

Use the converter below to change any millimeters of mercury value into millibars instantly — with formula, conversion table, and real-world examples.

1.333224

Conversion formula

Forward
millibars = millimeters of mercury × 1.33322
Reverse
millimeters of mercury = millibars × 0.7501

Example: 10 mmHg × 1.33322 = 13.3322 mbar.

About both units

From

Millimeter of Mercury

mmHg

The millimetre of mercury equals about 133.3 Pa — the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity. Traditionally and still used in medicine: blood pressure of 120/80 mmHg.

Real-world: Normal blood pressure: 120/80 mmHg. Atmospheric: 760 mmHg. Good vacuum: <1 mmHg.
Read full millimeter of mercury reference →
To

Millibar

mbar

The millibar equals 100 pascals or 1/1000 bar. It is the traditional unit for atmospheric pressure in meteorology (now called hectopascal, hPa, but numerically identical). Sea-level pressure averages 1013 mbar.

Real-world: Sea-level average: 1013 mbar. Deep low-pressure storm: below 980 mbar. Hurricane eye: below 920 mbar.
Read full millibar reference →

Millimeter of Mercury to Millibar conversion table

Common millimeters of mercury to millibars values for quick reference.

Millimeter of Mercury (mmHg)Millibar (mbar)
1 mmHg1.33322 mbar
5 mmHg6.66612 mbar
10 mmHg13.3322 mbar
25 mmHg33.3306 mbar
50 mmHg66.6612 mbar
100 mmHg133.322 mbar
200 mmHg266.645 mbar
500 mmHg666.612 mbar
1,000 mmHg1,333.22 mbar
5,000 mmHg6,666.12 mbar

Tips & common mistakes

Quick tips

  • 1 mmHg ≈ 133.32 Pa ≈ 1 Torr.
  • 760 mmHg = 1 atm.
  • Blood-pressure cuffs display mmHg worldwide.

Avoid these

  • Confusing mmHg with mmH₂O (different unit, factor of 13.6).
  • Mixing mmHg with torr in precise vacuum physics — they differ by one part per million.
  • Writing blood pressure in kPa — use mmHg for medical continuity.

Frequently asked questions

How many millibars in a millimeter of mercury?
One millimeter of mercury equals 1.33322 millibars.
How do I convert millimeters of mercury to millibars?
Multiply the millimeter of mercury value by 1.33322 to get the equivalent in millibars.
What is 100 millimeters of mercury in millibars?
100 millimeters of mercury equals 133.322 millibars.
Is a millimeter of mercury bigger than a millibar?
Yes. 1 millimeter of mercury equals 1.33322 millibars, so one millimeter of mercury is larger.
How to convert millimeters of mercury to millibars without a calculator?
Multiply by 1.33 for a quick estimate; use a calculator for precise results.

Related pressure conversions

📊 See full comparison matrix →

More from Millimeter of Mercury

mmHg → Pa
1 = 133.322 Pa
mmHg → kPa
1 = 0.1333 kPa
mmHg → MPa
1 = 0.0001333 MPa
mmHg → bar
1 = 0.001333 bar
mmHg → psi
1 = 0.01934 psi
mmHg → atm
1 = 0.001316 atm
mmHg → Torr
1 = 1 Torr
mmHg → inHg
1 = 0.03937 inHg

More to Millibar

Pa → mbar
1 = 0.01 mbar
kPa → mbar
1 = 10 mbar
MPa → mbar
1 = 10,000 mbar
bar → mbar
1 = 1,000 mbar
psi → mbar
1 = 68.9476 mbar
atm → mbar
1 = 1,013.25 mbar
Torr → mbar
1 = 1.33322 mbar
inHg → mbar
1 = 33.8639 mbar

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