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Millimeter mercury to Bar Converter

Enter the value that you want to convert millimeter mercury (mmHg) to bar or bar to millimeter mercury.

1 millimeter mercury = 0.0013332 bar

Formula: bar = millimeter mercury value × 0.0013332

millimeter mercury to bar

mmHg
0.01333bar

10 millimeter mercury = 0.01333 bar

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Converting Millimeter mercury to Bar

About the Millimeter mercury

Millimeter mercury (mmHg) is a unit of pressure measurement. 1 millimeter mercury is equal to 0.0013332 bar.

The Bar in Engineering

Bar (bar) is a unit of pressure measurement. 1 bar is equal to 750.0637554 millimeter mercury.

Pressure Units Across Industries

Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.

millimeter mercury to bar metric conversion table

0.01 mmHg=0.00001 bar
0.1 mmHg=0.00013 bar
1 mmHg=0.00133 bar
2 mmHg=0.00267 bar
3 mmHg=0.00400 bar
4 mmHg=0.00533 bar
5 mmHg=0.00667 bar
6 mmHg=0.00800 bar
7 mmHg=0.00933 bar
8 mmHg=0.01067 bar
9 mmHg=0.01200 bar
10 mmHg=0.01333 bar
11 mmHg=0.01467 bar
12 mmHg=0.01600 bar
13 mmHg=0.01733 bar
14 mmHg=0.01867 bar
15 mmHg=0.02000 bar
16 mmHg=0.02133 bar
17 mmHg=0.02266 bar
18 mmHg=0.02400 bar
19 mmHg=0.02533 bar
20 mmHg=0.02666 bar
30 mmHg=0.04000 bar
40 mmHg=0.05333 bar
50 mmHg=0.06666 bar
60 mmHg=0.07999 bar
70 mmHg=0.09333 bar
80 mmHg=0.10666 bar
90 mmHg=0.11999 bar
100 mmHg=0.13332 bar
200 mmHg=0.26664 bar
300 mmHg=0.39997 bar
400 mmHg=0.53329 bar
500 mmHg=0.66661 bar
600 mmHg=0.79993 bar
700 mmHg=0.93325 bar
800 mmHg=1.06658 bar
900 mmHg=1.19990 bar
1000 mmHg=1.33322 bar

How to Convert Millimeter mercury to Bar?

We can convert millimeter mercury to bar by using an example.

Example:

Convert 20 Millimeter mercury to Bar?

We know 1 Millimeter mercury = 0.0013332 bar; 1 Bar = 750.0637554 millimeter mercury.

20 millimeter mercury = ___bar

20 × 0.0013332 = 0.02666 bar (we know 1 millimeter mercury = 0.0013332 bar)

Answer:

20 millimeter mercury = 0.02666 bar

How to Convert mmHg to Bar (Step-by-Step)

Converting millimeters of mercury to bar bridges medical/laboratory measurements with industrial process pressure systems. The conversion factor is 1 mmHg = 0.00133322 bar.

  1. Write down the pressure value in mmHg.
  2. Multiply the mmHg value by 0.00133322.
  3. The result is the equivalent pressure in bar.
  4. Alternatively, divide the mmHg value by 750.062 to get bar.
💡 Tip: Key reference: 760 mmHg = 1.01325 bar (standard atmosphere). For rough estimates, divide mmHg by 750 to get bar (1.3% error). A blood pressure of 120 mmHg is only 0.16 bar — illustrating how small physiological pressures are on the industrial scale.

Common mmHg to Bar Conversions

Laboratory and medical pressure values converted to industrial bar scale.

Millimeter mercuryBar
1 mmHg0.001333 bar
10 mmHg0.01333 bar
50 mmHg0.06666 bar
100 mmHg0.13332 bar
200 mmHg0.26664 bar
500 mmHg0.66661 bar
760 mmHg1.01325 bar

Solved Examples: mmHg to Bar

Question 1: A laboratory distillation is performed at 50 mmHg reduced pressure. Express in bar for pump selection from a European catalog.

Solution:

Pressure in bar = Pressure in mmHg × 0.00133322

= 50 × 0.00133322

= 0.06666 bar

Answer: 50 mmHg = 0.0667 bar — select a pump with ultimate vacuum below this value.

Question 2: A manometer reads 400 mmHg gauge pressure in a pneumatic test. Convert to bar gauge.

Solution:

Pressure in bar = 400 × 0.00133322

= 0.5333 bar

Answer: 400 mmHg = 0.533 bar gauge — a low positive pressure.

Question 3: A freeze-dryer operates at 0.5 mmHg. What is this in bar?

Solution:

Pressure in bar = 0.5 × 0.00133322

= 0.000667 bar

Answer: 0.5 mmHg = 0.000667 bar (0.667 mbar) — adequate for lyophilization.

Practice Questions: mmHg to Bar

Try solving these on your own to test your understanding:

  1. Convert 760 mmHg to bar. (Answer: 1.01325 bar)
  2. A vacuum of 5 mmHg absolute in bar? (Answer: 0.00667 bar)
  3. Convert 250 mmHg to bar. (Answer: 0.3333 bar)
  4. Lab pressure of 700 mmHg to bar? (Answer: 0.9333 bar)
  5. Convert 0.1 mmHg to bar. (Answer: 0.000133 bar)

Vacuum Pump Selection: mmHg Specs vs Bar Catalogs

Laboratory protocols often specify vacuum levels in mmHg (e.g., "distill at 20 mmHg"), while vacuum pump manufacturers (Busch, Edwards, Pfeiffer) list ultimate vacuum in mbar or bar. The conversion: 20 mmHg = 0.0267 bar = 26.7 mbar. When selecting a pump, ensure its ultimate vacuum specification (in bar or mbar) is at least 2-3× lower than the target operating pressure to maintain adequate pumping speed at the setpoint.

Industrial Manometers: Legacy mmHg Scales

Older industrial U-tube manometers used mercury and read directly in mmHg. While mercury manometers are being phased out due to health concerns, their readings persist in legacy documentation. Process engineers updating old plant documentation must convert historical mmHg readings to modern bar-based instrument ranges. A legacy spec stating "maintain 300-400 mmHg gauge" translates to 0.400-0.533 bar gauge for new digital pressure transmitter configuration.

Key Takeaways

  • Multiply mmHg by 0.00133322 to get bar.
  • Alternatively, divide mmHg by 750.062 ≈ 750 for quick estimation.
  • 760 mmHg = 1.01325 bar (standard atmosphere).
  • Physiological pressures (80-200 mmHg) are tiny in bar (0.11-0.27 bar).
  • Vacuum pump catalogs specify in mbar or bar; lab protocols use mmHg.
  • Mercury manometers are being replaced, but mmHg readings persist in legacy documentation.

Millimeter mercury to Bar Conversion Formula

bar = millimeter mercury × 0.0013332

1 millimeter mercury = 0.0013332 bar

1 bar = 750.0637554 millimeter mercury

Reverse: millimeter mercury = bar × 750.0637554

Frequently Asked Questions

How many bar are in 1 millimeter mercury?

There are 0.0013332 bar in 1 millimeter mercury. To convert millimeter mercury to bar, multiply the value by 0.0013332.

How do I convert millimeter mercury to bar?

Multiply your millimeter mercury value by 0.0013332 to get the equivalent in bar. For example, 5 millimeter mercury = 5 × 0.0013332 = 0.00667 bar.

How do I convert bar to millimeter mercury?

Multiply your bar value by 750.0637554 to get the equivalent in millimeter mercury. Alternatively, divide by 0.0013332.

What is 10 millimeter mercury in bar?

10 millimeter mercury is equal to 0.01333 bar.

What is 100 millimeter mercury in bar?

100 millimeter mercury is equal to 0.13332 bar.