Convert Millimetre of mercury to Kilopascal
1 millimetre of mercury = 0.1333224 kilopascal (kPa). For example, 10 millimetre of mercury = 1.333224 kilopascal and 100 millimetre of mercury = 13.33224 kilopascal. Type any value below to convert millimetre of mercury to kilopascal both ways β it runs entirely in your browser.
Quick answer: Millimetre of mercury to Kilopascal
1 Millimetre of mercury = 0.1333224 Kilopascal (mmHg β kPa). To convert millimetre of mercury to kilopascal, multiply by 0.1333224. To convert kilopascal to millimetre of mercury, multiply by 7.500616. 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-kilopascal questions.
How to convert Millimetre of mercury to Kilopascal
To convert millimetre of mercury to kilopascal, multiply the number of millimetre of mercury by the conversion factor 0.1333224, because 1 mmHg = 0.1333224 kPa. The conversion is linear, so the same factor works for any value β whole numbers, decimals or fractions. For the reverse direction, 1 kPa = 7.500616 mmHg, so you divide by 0.1333224 (or multiply by 7.500616) to turn kilopascal back into millimetre of mercury.
kPa = mmHg Γ 0.1333224 Β·
mmHg = kPa Γ 7.500616
- Write down the value you want to convert, in millimetre of mercury.
- Multiply it by 0.1333224.
- The result is the same area/length/quantity expressed in kilopascal.
Millimetre of mercury to Kilopascal 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 0.6666119 kilopascal because 5 mmHg Γ 0.1333224 = 0.6666119 kPa.
| Millimetre of mercury | Calculation | Kilopascal |
|---|---|---|
| 1 mmHg | 1 mmHg Γ 0.1333224 = 0.1333224 kPa | 0.1333224 kPa |
| 2 mmHg | 2 mmHg Γ 0.1333224 = 0.2666448 kPa | 0.2666448 kPa |
| 3 mmHg | 3 mmHg Γ 0.1333224 = 0.3999672 kPa | 0.3999672 kPa |
| 5 mmHg | 5 mmHg Γ 0.1333224 = 0.6666119 kPa | 0.6666119 kPa |
| 7 mmHg | 7 mmHg Γ 0.1333224 = 0.9332567 kPa | 0.9332567 kPa |
| 10 mmHg | 10 mmHg Γ 0.1333224 = 1.333224 kPa | 1.333224 kPa |
| 12 mmHg | 12 mmHg Γ 0.1333224 = 1.599869 kPa | 1.599869 kPa |
| 15 mmHg | 15 mmHg Γ 0.1333224 = 1.999836 kPa | 1.999836 kPa |
| 20 mmHg | 20 mmHg Γ 0.1333224 = 2.666448 kPa | 2.666448 kPa |
| 25 mmHg | 25 mmHg Γ 0.1333224 = 3.33306 kPa | 3.33306 kPa |
| 50 mmHg | 50 mmHg Γ 0.1333224 = 6.666119 kPa | 6.666119 kPa |
| 100 mmHg | 100 mmHg Γ 0.1333224 = 13.33224 kPa | 13.33224 kPa |
Common Millimetre of mercury to Kilopascal conversions
These are the millimetre of mercury-to-kilopascal 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 = 0.1333224 kilopascal
- 2 millimetre of mercury = 0.2666448 kilopascal
- 2.5 millimetre of mercury = 0.333306 kilopascal
- 3 millimetre of mercury = 0.3999672 kilopascal
- 4 millimetre of mercury = 0.5332895 kilopascal
- 5 millimetre of mercury = 0.6666119 kilopascal
- 6 millimetre of mercury = 0.7999343 kilopascal
- 7 millimetre of mercury = 0.9332567 kilopascal
- 8 millimetre of mercury = 1.066579 kilopascal
- 9 millimetre of mercury = 1.199901 kilopascal
- 10 millimetre of mercury = 1.333224 kilopascal
- 12 millimetre of mercury = 1.599869 kilopascal
- 15 millimetre of mercury = 1.999836 kilopascal
- 20 millimetre of mercury = 2.666448 kilopascal
- 25 millimetre of mercury = 3.33306 kilopascal
- 30 millimetre of mercury = 3.999672 kilopascal
- 50 millimetre of mercury = 6.666119 kilopascal
- 75 millimetre of mercury = 9.999179 kilopascal
- 100 millimetre of mercury = 13.33224 kilopascal
- 200 millimetre of mercury = 26.66448 kilopascal
- 500 millimetre of mercury = 66.66119 kilopascal
- 1000 millimetre of mercury = 133.3224 kilopascal
Millimetre of mercury to Kilopascal conversion chart (both directions)
The chart below converts millimetre of mercury to kilopascal and kilopascal to millimetre of mercury side by side, so it works whichever way you need. 1 millimetre of mercury = 0.1333224 kilopascal, and 1 kilopascal = 7.500616 millimetre of mercury.
| Millimetre of mercury β Kilopascal | Kilopascal β Millimetre of mercury |
|---|---|
| 0.25 mmHg = 0.0333306 kPa | 0.25 kPa = 1.875154 mmHg |
| 0.5 mmHg = 0.06666119 kPa | 0.5 kPa = 3.750308 mmHg |
| 1 mmHg = 0.1333224 kPa | 1 kPa = 7.500616 mmHg |
| 2 mmHg = 0.2666448 kPa | 2 kPa = 15.00123 mmHg |
| 3 mmHg = 0.3999672 kPa | 3 kPa = 22.50185 mmHg |
| 4 mmHg = 0.5332895 kPa | 4 kPa = 30.00246 mmHg |
| 5 mmHg = 0.6666119 kPa | 5 kPa = 37.50308 mmHg |
| 6 mmHg = 0.7999343 kPa | 6 kPa = 45.00369 mmHg |
| 7 mmHg = 0.9332567 kPa | 7 kPa = 52.50431 mmHg |
| 8 mmHg = 1.066579 kPa | 8 kPa = 60.00493 mmHg |
| 9 mmHg = 1.199901 kPa | 9 kPa = 67.50554 mmHg |
| 10 mmHg = 1.333224 kPa | 10 kPa = 75.00616 mmHg |
| 12 mmHg = 1.599869 kPa | 12 kPa = 90.00739 mmHg |
| 15 mmHg = 1.999836 kPa | 15 kPa = 112.5092 mmHg |
| 20 mmHg = 2.666448 kPa | 20 kPa = 150.0123 mmHg |
| 25 mmHg = 3.33306 kPa | 25 kPa = 187.5154 mmHg |
| 30 mmHg = 3.999672 kPa | 30 kPa = 225.0185 mmHg |
| 40 mmHg = 5.332895 kPa | 40 kPa = 300.0246 mmHg |
| 50 mmHg = 6.666119 kPa | 50 kPa = 375.0308 mmHg |
| 75 mmHg = 9.999179 kPa | 75 kPa = 562.5462 mmHg |
| 100 mmHg = 13.33224 kPa | 100 kPa = 750.0616 mmHg |
| 150 mmHg = 19.99836 kPa | 150 kPa = 1,125.092 mmHg |
| 200 mmHg = 26.66448 kPa | 200 kPa = 1,500.123 mmHg |
| 250 mmHg = 33.3306 kPa | 250 kPa = 1,875.154 mmHg |
| 500 mmHg = 66.66119 kPa | 500 kPa = 3,750.308 mmHg |
| 1000 mmHg = 133.3224 kPa | 1000 kPa = 7,500.616 mmHg |
Millimetre of mercury vs Kilopascal: which is bigger?
A kilopascal is the larger unit: one kilopascal equals 7.500616 millimetre of mercurys. Put another way, you need 7.500616 millimetre of mercurys to make a single kilopascal.
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 Kilopascal? History, origin and usage
The kilopascal came into general use as countries converted their engineering standards to SI through the 1970s and 1980s. Canada, Australia and much of Europe moved tyre-pressure labels and gas-cylinder markings to kPa in that period, which is why a car built for one market often carries a door sticker in kPa and one built for another carries the same number in psi or bar.
Kilopascals are the workaday metric pressure unit: tyre pressures, medical gas supplies, water systems, ventilation and most mechanical engineering specifications. A car tyre is typically inflated to somewhere around 200 to 250 kPa.
One kilopascal is 1,000 pascals, and 100 kilopascals is very nearly one atmosphere β which is a useful mental shortcut, though the exact figure is 101.325 kPa, not 100.
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 Kilopascal to other units
One kilopascal (kPa) is equal to:
| 1 Kilopascal equals | Unit |
|---|---|
| 1,000 Pa | Pascal |
| 10 hPa | Hectopascal |
| 0.001 MPa | Megapascal |
| 10 mbar | Millibar |
| 0.01 bar | Bar |
| 0.009869233 atm | Standard atmosphere |
| 7.500617 Torr | Torr |
| 7.500616 mmHg | Millimetre of mercury |
| 0.2952998 inHg | Inch of mercury |
| 101.9716 mmHβO | Millimetre of water |
| 4.014631 inHβO | Inch of water |
| 0.1450377 psi | Pound per square inch |
| 0.01019716 kgf/cmΒ² | Kilogram-force per square centimetre |
Tips for converting Millimetre of mercury to Kilopascal
- To go from millimetre of mercury to kilopascal, multiply by 0.1333224; to go back, divide by 0.1333224 (or multiply by 7.500616).
- For a quick mental estimate, remember that 1 millimetre of mercury β 0.1333224 kilopascal, so 10 millimetre of mercury β 1.333224 kilopascal.
- 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 Kilopascal converter
Type a number into the Millimetre of mercury field and the equivalent in Kilopascal 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 Kilopascal field to convert the other way (kilopascal 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 = 0.1333224 kPa), 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-kilopascal 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 kilopascal are in 1 millimetre of mercury?
- 1 millimetre of mercury = 0.1333224 kilopascal (kPa). To convert any number of millimetre of mercury to kilopascal, multiply by 0.1333224.
- How do I convert millimetre of mercury to kilopascal?
- Multiply the number of millimetre of mercury by 0.1333224. For example, 10 millimetre of mercury = 10 Γ 0.1333224 = 1.333224 kilopascal, and 25 millimetre of mercury = 3.33306 kilopascal.
- How many millimetre of mercury are in 1 kilopascal?
- 1 kilopascal = 7.500616 millimetre of mercury. So to convert kilopascal back to millimetre of mercury, multiply by 7.500616.
- What is the formula to convert millimetre of mercury to kilopascal?
- kilopascal = millimetre of mercury Γ 0.1333224. The reverse formula is millimetre of mercury = kilopascal Γ 7.500616.
- How much is 100 millimetre of mercury in kilopascal?
- 100 millimetre of mercury = 13.33224 kilopascal. (And 1000 millimetre of mercury = 133.3224 kilopascal.)
- Which is bigger, a millimetre of mercury or a kilopascal?
- A kilopascal is larger: 1 kilopascal = 7.500616 millimetre of mercury.
- Is this millimetre of mercury to kilopascal converter accurate?
- Yes β every value is computed from the exact 0.1333224 kPa per mmHg factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert kilopascal to millimetre of mercury too?
- Yes. The converter works both ways β enter a value in either field. 1 kilopascal = 7.500616 millimetre of mercury.