Millimeters of mercury at standard gravity.
mmHgs to Bars Converter — mmHg to bar
Convert mmHg (mmHg) to Bar (bar) using the exact conversion factor (1 mmhg = 0.0013332239 bar). See the formula, worked examples, conversion table, history, and common uses.
mmHgs to Bars converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
A bar is exactly 100,000 pascals.
Result = input x 133.3223874 / 100000.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting mmHgs to Bars
mmHg and Bar both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Millimeters of mercury at standard gravity, and a bar is exactly 100,000 pascals.
Formula
bars = mmhgs × 0.00133322387415
This factor comes from each unit's defined relationship to the category's base unit: 1 mmhg equals 133.322387415 base units, and 1 bar equals 100000 base units, so dividing one by the other gives the direct mmhg-to-bar factor of 0.00133322387415.
Simple example
1 mmHg × 0.001333223874 = 0.0013332239 bar
1 mmhg = 0.0013332239 bars.
Real-world example
100 mmHg × 0.001333223874 = 0.1333223874 bar
100 mmhgs = 0.1333223874 bars.
Conversion table
| mmHg (mmHg) | Bar (bar) |
|---|---|
| 1 mmHg | 0.0013332239 bar |
| 10 mmHg | 0.0133322387 bar |
| 50 mmHg | 0.0666611937 bar |
| 100 mmHg | 0.1333223874 bar |
| 500 mmHg | 0.6666119371 bar |
| 1,000 mmHg | 1.333223874 bar |
Reverse conversion: Bar to mmHg
0.0013332239 bar × 750.0615758 = 1.000000019 mmHg
0.0013332239 bars = 1.000000019 mmhgs.
mmhgs = bars × 750.061575846
For a page dedicated to this direction, see Bar to mmHg.
Understanding the mmHg (mmHg)
Millimeters of mercury at standard gravity.
Understanding the Bar
Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.
Where it's used: Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure
Uses of the Bar today
- Tire pressure specifications outside the US
- Meteorology (weather maps commonly use millibars, hPa)
- Industrial and hydraulic pressure ratings in metric-system countries
History of the Bar
The bar was proposed by Norwegian meteorologist Vilhelm Bjerknes around 1906 as a convenient round pressure unit close to atmospheric pressure, derived from the CGS unit system (one bar equals one million dynes per square centimeter).
Though not an SI unit, the bar remains in wide practical use, particularly in meteorology (as the millibar, now more often written as the equivalent hectopascal) and in tire and hydraulic pressure specifications across most of the world.
Historical origin. Bar was not the invention of a single named person; it developed through the process described above.
Bar — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the bar among accepted non-SI pressure units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many bars are in 1 mmhg?
1 mmhg equals 0.0013332239 bars, using the exact defined conversion factor rather than an estimate.
How do I convert mmhg to bar?
Multiply the mmhg value by 0.001333223874. The converter above does this instantly to whatever precision you set.
How do I convert bar back to mmhg?
Use the reverse factor: 1 bar equals 750.0615758 mmhgs. You can also use the swap control in the converter above to flip the direction instantly.
What is a mmhg?
mmHg (mmHg) is a unit of engineering.
What is a bar?
Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.
Is the mmhg to bar conversion exact?
Yes. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.