mmHg to Pascals Converter

mmHg to Pascals

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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.

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

A Sense of Scale

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

Precision

The factor 133.322387415 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 mmHgToPascal = (value) => value * 133.322387415; ``

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 mmHg with the factor truncated at each decimal place:

Decimals kept	Factor	137 mmHg becomes	Error
0	133	18,221	0.2418%
1	133.3	18,262.1	0.0168%
2	133.32	18,264.84	0.0018%
3	133.322	18,265.11	0.0003%
4	133.3224	18,265.17	—

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 mmhg to three significant figures, the answer in pascals is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From mmHg

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

From	To	Unit
1 mmHg	0.133322 kPa	Kilopascals
1 mmHg	0.00133322 bar	Bar
1 mmHg	0.00131579 atm	Atmospheres
1 mmHg	0.0193368 psi	PSI

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