Pascals to mmHg Converter

Pascals to mmHg

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

The Formula

`` mmhg = pascals × 0.00750061575846 pascals = mmhg × 133.322387415 `

One pascal is 0.007501 mmhg, and one mmhg is 133.3224 pascals.

Conversion Table

Pascals	mmHg
1 Pa	0.007501 mmHg
2 Pa	0.015001 mmHg
5 Pa	0.037503 mmHg
10 Pa	0.075006 mmHg
25 Pa	0.187515 mmHg
50 Pa	0.375031 mmHg
100 Pa	0.750062 mmHg
500 Pa	3.7503 mmHg
1,000 Pa	7.5006 mmHg

The Other Direction

mmHg	Pascals
1 mmHg	133.3224 Pa
2 mmHg	266.6448 Pa
5 mmHg	666.6119 Pa
10 mmHg	1,333.22 Pa
25 mmHg	3,333.06 Pa
50 mmHg	6,666.12 Pa
100 mmHg	13,332.24 Pa
500 mmHg	66,661.19 Pa
1,000 mmHg	133,322.39 Pa

What Each Unit Is

Pascals (Pa) — one newton per square metre — the SI derived unit of pressure. Named for Blaise Pascal, who established that pressure varies with altitude.

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

• Atmospheric pressure is 101,325 Pa
• A pascal is a very small unit
• Normal blood pressure is 120/80 mmHg
• Atmospheric pressure is 760 mmHg

Precision

The factor 0.00750061575846 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 pascalToMmHg = (value) => value * 0.00750061575846; ``

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 Pa with the factor truncated at each decimal place:

Decimals kept	Factor	137 Pa becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0.01	1.37	33.3224%
3	0.008	1.096	6.6579%
4	0.0075	1.0275	0.0082%

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 pascals 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 Pascals

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

From	To	Unit
1 Pa	0.001 kPa	Kilopascals
1 Pa	1.0000e-5 bar	Bar
1 Pa	9.8692e-6 atm	Atmospheres
1 Pa	1.4504e-4 psi	PSI

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