Convert Millimetre of mercury to Pascal
1 millimetre of mercury = 133.3224 pascal (Pa). For example, 10 millimetre of mercury = 1,333.224 pascal and 100 millimetre of mercury = 13,332.24 pascal. Type any value below to convert millimetre of mercury to pascal both ways β it runs entirely in your browser.
Quick answer: Millimetre of mercury to Pascal
1 Millimetre of mercury = 133.3224 Pascal (mmHg β Pa). To convert millimetre of mercury to pascal, multiply by 133.3224. To convert pascal to millimetre of mercury, multiply by 0.007500616. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common millimetre of mercury-to-pascal questions.
How to convert Millimetre of mercury to Pascal
To convert millimetre of mercury to pascal, multiply the number of millimetre of mercury by the conversion factor 133.3224, because 1 mmHg = 133.3224 Pa. The conversion is linear, so the same factor works for any value β whole numbers, decimals or fractions. For the reverse direction, 1 Pa = 0.007500616 mmHg, so you divide by 133.3224 (or multiply by 0.007500616) to turn pascal back into millimetre of mercury.
Pa = mmHg Γ 133.3224 Β·
mmHg = Pa Γ 0.007500616
- Write down the value you want to convert, in millimetre of mercury.
- Multiply it by 133.3224.
- The result is the same area/length/quantity expressed in pascal.
Millimetre of mercury to Pascal β worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 millimetre of mercury is 666.6119 pascal because 5 mmHg Γ 133.3224 = 666.6119 Pa.
| Millimetre of mercury | Calculation | Pascal |
|---|---|---|
| 1 mmHg | 1 mmHg Γ 133.3224 = 133.3224 Pa | 133.3224 Pa |
| 2 mmHg | 2 mmHg Γ 133.3224 = 266.6448 Pa | 266.6448 Pa |
| 3 mmHg | 3 mmHg Γ 133.3224 = 399.9672 Pa | 399.9672 Pa |
| 5 mmHg | 5 mmHg Γ 133.3224 = 666.6119 Pa | 666.6119 Pa |
| 7 mmHg | 7 mmHg Γ 133.3224 = 933.2567 Pa | 933.2567 Pa |
| 10 mmHg | 10 mmHg Γ 133.3224 = 1,333.224 Pa | 1,333.224 Pa |
| 12 mmHg | 12 mmHg Γ 133.3224 = 1,599.869 Pa | 1,599.869 Pa |
| 15 mmHg | 15 mmHg Γ 133.3224 = 1,999.836 Pa | 1,999.836 Pa |
| 20 mmHg | 20 mmHg Γ 133.3224 = 2,666.448 Pa | 2,666.448 Pa |
| 25 mmHg | 25 mmHg Γ 133.3224 = 3,333.06 Pa | 3,333.06 Pa |
| 50 mmHg | 50 mmHg Γ 133.3224 = 6,666.119 Pa | 6,666.119 Pa |
| 100 mmHg | 100 mmHg Γ 133.3224 = 13,332.24 Pa | 13,332.24 Pa |
Common Millimetre of mercury to Pascal conversions
These are the millimetre of mercury-to-pascal values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 millimetre of mercury = 133.3224 pascal
- 2 millimetre of mercury = 266.6448 pascal
- 2.5 millimetre of mercury = 333.306 pascal
- 3 millimetre of mercury = 399.9672 pascal
- 4 millimetre of mercury = 533.2895 pascal
- 5 millimetre of mercury = 666.6119 pascal
- 6 millimetre of mercury = 799.9343 pascal
- 7 millimetre of mercury = 933.2567 pascal
- 8 millimetre of mercury = 1,066.579 pascal
- 9 millimetre of mercury = 1,199.901 pascal
- 10 millimetre of mercury = 1,333.224 pascal
- 12 millimetre of mercury = 1,599.869 pascal
- 15 millimetre of mercury = 1,999.836 pascal
- 20 millimetre of mercury = 2,666.448 pascal
- 25 millimetre of mercury = 3,333.06 pascal
- 30 millimetre of mercury = 3,999.672 pascal
- 50 millimetre of mercury = 6,666.119 pascal
- 75 millimetre of mercury = 9,999.179 pascal
- 100 millimetre of mercury = 13,332.24 pascal
- 200 millimetre of mercury = 26,664.48 pascal
- 500 millimetre of mercury = 66,661.19 pascal
- 1000 millimetre of mercury = 133,322.4 pascal
Millimetre of mercury to Pascal conversion chart (both directions)
The chart below converts millimetre of mercury to pascal and pascal to millimetre of mercury side by side, so it works whichever way you need. 1 millimetre of mercury = 133.3224 pascal, and 1 pascal = 0.007500616 millimetre of mercury.
| Millimetre of mercury β Pascal | Pascal β Millimetre of mercury |
|---|---|
| 0.25 mmHg = 33.3306 Pa | 0.25 Pa = 0.001875154 mmHg |
| 0.5 mmHg = 66.66119 Pa | 0.5 Pa = 0.003750308 mmHg |
| 1 mmHg = 133.3224 Pa | 1 Pa = 0.007500616 mmHg |
| 2 mmHg = 266.6448 Pa | 2 Pa = 0.01500123 mmHg |
| 3 mmHg = 399.9672 Pa | 3 Pa = 0.02250185 mmHg |
| 4 mmHg = 533.2895 Pa | 4 Pa = 0.03000246 mmHg |
| 5 mmHg = 666.6119 Pa | 5 Pa = 0.03750308 mmHg |
| 6 mmHg = 799.9343 Pa | 6 Pa = 0.04500369 mmHg |
| 7 mmHg = 933.2567 Pa | 7 Pa = 0.05250431 mmHg |
| 8 mmHg = 1,066.579 Pa | 8 Pa = 0.06000493 mmHg |
| 9 mmHg = 1,199.901 Pa | 9 Pa = 0.06750554 mmHg |
| 10 mmHg = 1,333.224 Pa | 10 Pa = 0.07500616 mmHg |
| 12 mmHg = 1,599.869 Pa | 12 Pa = 0.09000739 mmHg |
| 15 mmHg = 1,999.836 Pa | 15 Pa = 0.1125092 mmHg |
| 20 mmHg = 2,666.448 Pa | 20 Pa = 0.1500123 mmHg |
| 25 mmHg = 3,333.06 Pa | 25 Pa = 0.1875154 mmHg |
| 30 mmHg = 3,999.672 Pa | 30 Pa = 0.2250185 mmHg |
| 40 mmHg = 5,332.895 Pa | 40 Pa = 0.3000246 mmHg |
| 50 mmHg = 6,666.119 Pa | 50 Pa = 0.3750308 mmHg |
| 75 mmHg = 9,999.179 Pa | 75 Pa = 0.5625462 mmHg |
| 100 mmHg = 13,332.24 Pa | 100 Pa = 0.7500616 mmHg |
| 150 mmHg = 19,998.36 Pa | 150 Pa = 1.125092 mmHg |
| 200 mmHg = 26,664.48 Pa | 200 Pa = 1.500123 mmHg |
| 250 mmHg = 33,330.6 Pa | 250 Pa = 1.875154 mmHg |
| 500 mmHg = 66,661.19 Pa | 500 Pa = 3.750308 mmHg |
| 1000 mmHg = 133,322.4 Pa | 1000 Pa = 7.500616 mmHg |
Millimetre of mercury vs Pascal: which is bigger?
A millimetre of mercury is the larger unit: one millimetre of mercury equals 133.3224 pascals. Put another way, you need 133.3224 pascals to make a single millimetre of mercury.
What is a Millimetre of mercury? History, origin and usage
Measuring pressure by the height of a mercury column dates to Torricelli in 1643 and became the standard laboratory method for three centuries. Mercury was chosen because it is dense enough to keep the tube a manageable length β a water barometer measuring the same pressure would need to be over ten metres tall. The modern unit no longer depends on real mercury: it is fixed at exactly 133.322387415 pascals, the value a millimetre of mercury would give at a conventional density of 13,595.1 kg per cubic metre under standard gravity.
Millimetres of mercury are the universal unit of blood pressure β a reading of "120 over 80" means 120 mmHg when the heart contracts and 80 mmHg between beats. They are also used for eye pressure, cerebrospinal fluid pressure and some vacuum work.
Mercury sphygmomanometers are being retired worldwide because of the toxicity of mercury, yet the unit has outlived the instrument: digital monitors with no mercury in them still report in mmHg, because a century of medical guidance is written in it.
What is a Pascal? History, origin and usage
The pascal is named after Blaise Pascal, who in 1648 had his brother-in-law carry a mercury barometer up the Puy de DΓ΄me in central France and watch the mercury column fall as he climbed. That experiment showed air has weight and that the pressure it exerts drops with height. The unit itself is much younger: the name was adopted by the General Conference on Weights and Measures in 1971, replacing the older habit of writing pressures as "newtons per square metre".
The pascal is the SI unit of pressure and the base every other unit on this page is defined against. On its own it is awkwardly small for daily life β a sheet of paper resting on a table presses down with only a few pascals β so real-world figures are almost always given with a prefix: hectopascals for weather, kilopascals for tyres and gas, megapascals for concrete and hydraulics.
One pascal is one newton spread over one square metre, which is about the pressure of a five-rupee coin lying flat on a table. Because pressure is force divided by area, the same push concentrated into a smaller area gives a much higher pressure β which is why a drawing pin goes into a wall and your thumb does not.
Convert 1 Millimetre of mercury to other units
It can help to see a millimetre of mercury next to the other units it is commonly compared with. One millimetre of mercury (mmHg) is equal to:
| 1 Millimetre of mercury equals | Unit |
|---|---|
| 133.3224 Pa | Pascal |
| 1.333224 hPa | Hectopascal |
| 0.1333224 kPa | Kilopascal |
| 0.0001333224 MPa | Megapascal |
| 1.333224 mbar | Millibar |
| 0.001333224 bar | Bar |
| 0.00131579 atm | Standard atmosphere |
| 1 Torr | Torr |
| 0.03937008 inHg | Inch of mercury |
| 13.5951 mmHβO | Millimetre of water |
| 0.5352402 inHβO | Inch of water |
| 0.01933678 psi | Pound per square inch |
| 0.00135951 kgf/cmΒ² | Kilogram-force per square centimetre |
Convert 1 Pascal to other units
One pascal (Pa) is equal to:
| 1 Pascal equals | Unit |
|---|---|
| 0.01 hPa | Hectopascal |
| 0.001 kPa | Kilopascal |
| 0.000001 MPa | Megapascal |
| 0.01 mbar | Millibar |
| 0.00001 bar | Bar |
| 0.000009869233 atm | Standard atmosphere |
| 0.007500617 Torr | Torr |
| 0.007500616 mmHg | Millimetre of mercury |
| 0.0002952998 inHg | Inch of mercury |
| 0.1019716 mmHβO | Millimetre of water |
| 0.004014631 inHβO | Inch of water |
| 0.0001450377 psi | Pound per square inch |
| 0.00001019716 kgf/cmΒ² | Kilogram-force per square centimetre |
Tips for converting Millimetre of mercury to Pascal
- To go from millimetre of mercury to pascal, multiply by 133.3224; to go back, divide by 133.3224 (or multiply by 0.007500616).
- For a quick mental estimate, remember that 1 millimetre of mercury β 133.3224 pascal, so 10 millimetre of mercury β 1,333.224 pascal.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type β change either side to convert in that direction.
How to use this Millimetre of mercury to Pascal converter
Type a number into the Millimetre of mercury field and the equivalent in Pascal appears instantly β there is no βconvertβ button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Pascal field to convert the other way (pascal to millimetre of mercury). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above β use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page β the formula, the worked examples, the conversion chart and the βconvert to other unitsβ tables β is computed from a single verified conversion factor (1 mmHg = 133.3224 Pa), never copied from a hand-typed lookup table that could drift. That factor is derived from each unitβs definition in terms of a common base unit, and an automated check re-verifies all of the siteβs factors on every update, so the numbers here stay correct over time. This matters for millimetre of mercury-to-pascal conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- BIPM β The International System of Units (SI Brochure) β the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
- NIST β Definitions of the SI base units β the US National Institute of Standards and Technology reference for the SI base units, used here as an independent cross-check on the base-unit definition.
Pressure factors here come from fixed definitions, anchored to the pascal: a bar is exactly 100,000 Pa, one atmosphere is exactly 101,325 Pa, a torr is exactly a 760th of an atmosphere, and psi is built from the exact pound and the exact inch. Two of them β psi and the torr β work out to decimals that repeat forever, so where a number is shown rounded it is marked, not quietly trimmed.
Frequently asked questions
- How many pascal are in 1 millimetre of mercury?
- 1 millimetre of mercury = 133.3224 pascal (Pa). To convert any number of millimetre of mercury to pascal, multiply by 133.3224.
- How do I convert millimetre of mercury to pascal?
- Multiply the number of millimetre of mercury by 133.3224. For example, 10 millimetre of mercury = 10 Γ 133.3224 = 1,333.224 pascal, and 25 millimetre of mercury = 3,333.06 pascal.
- How many millimetre of mercury are in 1 pascal?
- 1 pascal = 0.007500616 millimetre of mercury. So to convert pascal back to millimetre of mercury, multiply by 0.007500616.
- What is the formula to convert millimetre of mercury to pascal?
- pascal = millimetre of mercury Γ 133.3224. The reverse formula is millimetre of mercury = pascal Γ 0.007500616.
- How much is 100 millimetre of mercury in pascal?
- 100 millimetre of mercury = 13,332.24 pascal. (And 1000 millimetre of mercury = 133,322.4 pascal.)
- Which is bigger, a millimetre of mercury or a pascal?
- A millimetre of mercury is larger: 1 millimetre of mercury = 133.3224 pascal.
- Is this millimetre of mercury to pascal converter accurate?
- Yes β every value is computed from the exact 133.3224 Pa per mmHg factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert pascal to millimetre of mercury too?
- Yes. The converter works both ways β enter a value in either field. 1 pascal = 0.007500616 millimetre of mercury.