How many pascals is 1 mmHg?

Exactly 133.322387415 Pa, and the exact arithmetic scales linearly, while long displayed results still round: 2 mmHg is 266.64477483 Pa, 5 mmHg is 666.611937075 Pa, 20 mmHg is 2,666.4477483 Pa, 100 mmHg is 13,332.2387415 Pa and 1,000 mmHg is 133,322.387415 Pa. Going down instead, 0.001 mmHg is 0.133322387415 Pa. Answers print to twelve significant digits, preserving the factor’s digits but rounding longer products when needed.

What is the formula for mmHg to Pa?

Pascals = millimetres of mercury × 133.322387415, and millimetres of mercury = pascals / 133.322387415, using the exact divisor; multiplying by the rounded reciprocal 0.00750061575846 only approximates it and can change final rounding. So 1 Pa is 0.00750061575846 mmHg, 1,000 Pa is 7.50061575846 mmHg and 100,000 Pa is 750.061575846 mmHg. The swap button between the two boxes reverses the pair, which turns this into a pascals to mmHg converter without a reload.

Where does the number 133.322387415 come from?

From three conventions multiplied together: a mercury density of 13,595.1 kg/m³, a standard gravity of 9.80665 m/s² and a height of one millimetre. Because all three are fixed by agreement rather than measured on the day, their product is exact and the unit does not drift. Real mercury is a different matter, since its density moves with temperature, so an actual mercury column and the conventional unit named after it are not quite the same thing.

Is 760 mmHg exactly one atmosphere?

No. Conventional 760 mmHg is exactly 101,325.0144354 Pa, displaying as 101,325.014435 Pa, while a standard atmosphere is exactly 101,325 Pa. One atm displays as 759.999891726 conventional mmHg. Torr is exactly 101,325/760 Pa, approximately 133.322368421 Pa, and differs from conventional mmHg by about 1.4 parts in ten million. Rounded digit agreement depends on the quantity and precision; the two definitions are distinct.

How do I convert kPa or bar to mmHg?

Press the swap button and then pick the unit you have in the From menu, or read the rows under the answer. One kilopascal is 7.50061575846 mmHg, one bar is 750.061575846 mmHg, and 101.325 kPa comes back as 759.999891726 mmHg. In the other direction 760 mmHg is 101.325014435 kPa and 1.01325014435 bar, both of them listed the moment you type the figure.

What about hectopascals and millibars, the units on a weather map?

These are absent from the menu. For a separately supplied definition, 1 hPa = 100 Pa and 1 mbar = 100 Pa, so calculate directly from original mmHg as hPa = mbar = mmHg × 133.322387415 / 100. Thus 760 mmHg displays as 1,013.25014435 hPa or mbar. Moving the point in a rounded Pa or bar readout only approximates the original quotient. A map or instrument alone does not establish the source convention.

Why does the list under the answer not repeat mmHg?

The list shows every other unit in the category and skips the one you are converting from, so here it reads pascals, kilopascals, bar, pounds per square inch and atmospheres, with the pascal figure appearing both in the headline and as a row. The readout strip also carries an Uncommon units switch labelled Show 1 more, because mmHg is the one uncommon pressure unit; on this page turning it on changes nothing you can see, since the unit it would add is already in the From box.

Why does the page open on mmHg and Pa when I last converted something else?

This focused page opens on Millimeter of mercury and Pascal, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. The converter preserves the supplied pressure reference and has no gauge-to-absolute mode. Absolute pressure is relative to vacuum; gauge pressure is relative to a supplied reference. To derive absolute pressure separately, supply the applicable ambient pressure and add the signed gauge quantity before converting. One standard atmosphere is a defined unit, not a measurement of current ambient pressure. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

mmHg to Pa Converter

The conventional millimetre of mercury is defined rather than measured: a millimetre of mercury at a density of 13,595.1 kg/m³ under a standard gravity of 9.80665 m/s², which multiplies out to exactly 133.322387415 pascals. So mmHg to Pa is one multiplication, Pa = mmHg × 133.322387415, landing in the SI unit of pressure, one newton per square metre. That makes 1 mmHg 133.322387415 Pa, 2 mmHg 266.64477483 Pa, 7.5 mmHg 999.917905613 Pa, 10 mmHg 1,333.22387415 Pa, 100 mmHg 13,332.2387415 Pa, 750 mmHg 99,991.7905613 Pa and 760 mmHg 101,325.014435 Pa, a shade over the 101,325 Pa of a standard atmosphere because 760 to the atmosphere defines the torr and not the conventional mmHg. This page opens the converter with mmHg in the From box and Pascal (Pa) in the To box, ahead of whatever pair you converted last, and the list under the answer carries the same pressure in kilopascals, bar, pounds per square inch and atmospheres, so 760 mmHg also reads 101.325014435 kPa, 1.01325014435 bar, 14.6959508692 psi and 1.00000014247 atm. It changes the units on a number and nothing else: what the figure describes is not something arithmetic can tell you.

From

To133.322387415

Category: Pressure

Base unit: pascal

Uncommon units: Show 1 more

One standard atmosphere is 101,325 Pa. mmHg is the conventional 133.322387415 Pa, distinct from the torr (exactly 101,325/760 Pa). The psi coefficient is rounded to 6,894.757293168 Pa. Converting units preserves gauge or absolute reference; it does not add ambient pressure.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 mmHg in every pressure unit

PascalPa
133.322387415
KilopascalkPa
0.133322387415
Barbar
0.00133322387415
Pound per square inchpsi
0.0193367774595
Atmosphereatm
0.00131578966114

Selectable complete conversion

Unit Converter — Pressure
Input: 1 (Millimeter of mercury, mmHg)
Result: 133.322387415 Pa (Pascal)
Displayed values round to 12 significant digits.
One standard atmosphere is 101,325 Pa. mmHg is the conventional 133.322387415 Pa, distinct from the torr (exactly 101,325/760 Pa). The psi coefficient is rounded to 6,894.757293168 Pa. Converting units preserves gauge or absolute reference; it does not add ambient pressure.
All other units:
Pascal (Pa): 133.322387415
Kilopascal (kPa): 0.133322387415
Bar (bar): 0.00133322387415
Pound per square inch (psi): 0.0193367774595
Atmosphere (atm): 0.00131578966114

Common questions

How many pascals is 1 mmHg?: Exactly 133.322387415 Pa, and the exact arithmetic scales linearly, while long displayed results still round: 2 mmHg is 266.64477483 Pa, 5 mmHg is 666.611937075 Pa, 20 mmHg is 2,666.4477483 Pa, 100 mmHg is 13,332.2387415 Pa and 1,000 mmHg is 133,322.387415 Pa. Going down instead, 0.001 mmHg is 0.133322387415 Pa. Answers print to twelve significant digits, preserving the factor’s digits but rounding longer products when needed.
What is the formula for mmHg to Pa?: Pascals = millimetres of mercury × 133.322387415, and millimetres of mercury = pascals / 133.322387415, using the exact divisor; multiplying by the rounded reciprocal 0.00750061575846 only approximates it and can change final rounding. So 1 Pa is 0.00750061575846 mmHg, 1,000 Pa is 7.50061575846 mmHg and 100,000 Pa is 750.061575846 mmHg. The swap button between the two boxes reverses the pair, which turns this into a pascals to mmHg converter without a reload.
Where does the number 133.322387415 come from?: From three conventions multiplied together: a mercury density of 13,595.1 kg/m³, a standard gravity of 9.80665 m/s² and a height of one millimetre. Because all three are fixed by agreement rather than measured on the day, their product is exact and the unit does not drift. Real mercury is a different matter, since its density moves with temperature, so an actual mercury column and the conventional unit named after it are not quite the same thing.
Is 760 mmHg exactly one atmosphere?: No. Conventional 760 mmHg is exactly 101,325.0144354 Pa, displaying as 101,325.014435 Pa, while a standard atmosphere is exactly 101,325 Pa. One atm displays as 759.999891726 conventional mmHg. Torr is exactly 101,325/760 Pa, approximately 133.322368421 Pa, and differs from conventional mmHg by about 1.4 parts in ten million. Rounded digit agreement depends on the quantity and precision; the two definitions are distinct.
How do I convert kPa or bar to mmHg?: Press the swap button and then pick the unit you have in the From menu, or read the rows under the answer. One kilopascal is 7.50061575846 mmHg, one bar is 750.061575846 mmHg, and 101.325 kPa comes back as 759.999891726 mmHg. In the other direction 760 mmHg is 101.325014435 kPa and 1.01325014435 bar, both of them listed the moment you type the figure.
What about hectopascals and millibars, the units on a weather map?: These are absent from the menu. For a separately supplied definition, 1 hPa = 100 Pa and 1 mbar = 100 Pa, so calculate directly from original mmHg as hPa = mbar = mmHg × 133.322387415 / 100. Thus 760 mmHg displays as 1,013.25014435 hPa or mbar. Moving the point in a rounded Pa or bar readout only approximates the original quotient. A map or instrument alone does not establish the source convention.
Why does the list under the answer not repeat mmHg?: The list shows every other unit in the category and skips the one you are converting from, so here it reads pascals, kilopascals, bar, pounds per square inch and atmospheres, with the pascal figure appearing both in the headline and as a row. The readout strip also carries an Uncommon units switch labelled Show 1 more, because mmHg is the one uncommon pressure unit; on this page turning it on changes nothing you can see, since the unit it would add is already in the From box.
Why does the page open on mmHg and Pa when I last converted something else?: This focused page opens on Millimeter of mercury and Pascal, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. The converter preserves the supplied pressure reference and has no gauge-to-absolute mode. Absolute pressure is relative to vacuum; gauge pressure is relative to a supplied reference. To derive absolute pressure separately, supply the applicable ambient pressure and add the signed gauge quantity before converting. One standard atmosphere is a defined unit, not a measurement of current ambient pressure. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.