Bar to mmHg Converter

Bar to mmHg

Convert bar (bar) to mmhg (mmHg). Both measure force per area, and the conversion comes up in weather, automotive, diving work.

The Formula

`` mmhg = bar × 750.061575846 bar = mmhg × 0.00133322387415 `

One bar is 750.0616 mmhg, and one mmhg is 0.001333 bar.

Conversion Table

Bar	mmHg
1 bar	750.0616 mmHg
2 bar	1,500.12 mmHg
5 bar	3,750.31 mmHg
10 bar	7,500.62 mmHg
25 bar	18,751.54 mmHg
50 bar	37,503.08 mmHg
100 bar	75,006.16 mmHg
500 bar	375,030.79 mmHg
1,000 bar	750,061.58 mmHg

The Other Direction

mmHg	Bar
1 mmHg	0.001333 bar
2 mmHg	0.002666 bar
5 mmHg	0.006666 bar
10 mmHg	0.013332 bar
25 mmHg	0.033331 bar
50 mmHg	0.066661 bar
100 mmHg	0.133322 bar
500 mmHg	0.666612 bar
1,000 mmHg	1.3332 bar

What Each Unit Is

Bar (bar) — exactly 100,000 pascals — close to, but not exactly, one atmosphere. Introduced by meteorologist Vilhelm Bjerknes; weather maps use millibars.

mmHg (mmHg) — the pressure of a one-millimetre column of mercury, or 133.322 pascals. From the mercury barometer; medicine kept it after physics moved to pascals.

A Sense of Scale

• Sea-level pressure is about 1.013 bar
• Diving adds 1 bar per 10 m of depth
• Normal blood pressure is 120/80 mmHg
• Atmospheric pressure is 760 mmHg

Precision

The factor 750.061575846 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

In Code

`javascript const barToMmHg = (value) => value * 750.061575846; ``

Where This Conversion Comes Up

• Weather
• Automotive
• Diving
• Aviation
• HVAC

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 bar with the factor truncated at each decimal place:

Decimals kept	Factor	137 bar becomes	Error
0	750	102,750	0.0082%
1	750.1	102,763.7	0.0051%
2	750.06	102,758.22	0.0002%
3	750.062	102,758.49	—
4	750.0616	102,758.44	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured bar to three significant figures, the answer in mmhg is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Bar

The same value in every other unit this converter supports for pressure:

From	To	Unit
1 bar	100,000 Pa	Pascals
1 bar	100 kPa	Kilopascals
1 bar	0.986923 atm	Atmospheres
1 bar	14.5038 psi	PSI

Chaining conversions works — bar to metres to feet gives the same answer as bar to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.