Convert Millimeters of Mercury to Kilopascals
1 millimeter of mercury (mmHg) equals 0.1333223874 kilopascals (kPa).
1 mmHg = 0.1333223874 kPa
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of mercury to kilopascal converter to paste a column from Excel.
How to Convert Millimeter of Mercury to Kilopascal
- 1 mmHg = 0.1333223874 kPa
- 1 kPa = 7.500615758 mmHg
- Example: convert 15 mmHg to kPa: 15 mmHg = 15 × 0.1333223874 kPa = 1.999835811 kPa
Reference conditions. mmHg: Conventional mercury column: ρ = 13 595.1 kg/m³ and gₙ = 9.80665 m/s² (≈ mercury at 0 °C / 32 °F).
Formula
kPa = mmHg × 0.133322387415
or kPa = mmHg ÷ 7.500615758457
Derivation from SI units:
- 1 mmHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.001 m = 133.322387415 Pa
- 1 kPa = 10³ Pa
- 1 mmHg = 133.322387415 Pa ÷ 1000 Pa per kPa = 0.133322387415 kPa
Both units are defined exactly, so the factor is exact. Millimeter of Mercury definition: millimeter of mercury; Kilopascal definition: kilopascal.
Worked examples
- A diastolic pressure of 80 mmHg is 10.66579099 kPa.
80 mmHg × 0.1333223874 = 10.66579099 kPa - A normal arterial CO₂ partial pressure of about 40 mmHg is 5.332895497 kPa.
40 mmHg × 0.1333223874 = 5.332895497 kPa
Millimeter of Mercury to Kilopascal conversion table
| Millimeters of Mercury (mmHg) | Kilopascals (kPa) |
|---|---|
| 1 mmHg | 0.1333223874 kPa |
| 5 mmHg | 0.6666119371 kPa |
| 10 mmHg | 1.333223874 kPa |
| 20 mmHg | 2.666447748 kPa |
| 40 mmHg | 5.332895497 kPa |
| 60 mmHg | 7.999343245 kPa |
| 70 mmHg | 9.332567119 kPa |
| 80 mmHg | 10.66579099 kPa |
| 90 mmHg | 11.99901487 kPa |
| 100 mmHg | 13.33223874 kPa |
| 110 mmHg | 14.66546262 kPa |
| 120 mmHg | 15.99868649 kPa |
| 130 mmHg | 17.33191036 kPa |
| 140 mmHg | 18.66513424 kPa |
| 160 mmHg | 21.33158199 kPa |
| 180 mmHg | 23.99802973 kPa |
| 200 mmHg | 26.66447748 kPa |
| 300 mmHg | 39.99671622 kPa |
| 500 mmHg | 66.66119371 kPa |
| 750 mmHg | 99.99179056 kPa |
| 760 mmHg | 101.3250144 kPa |
Where it's used
Blood gas results are reported in kPa in the UK and much of Europe and in mmHg in the US. Converting mmHg to kPa (divide by about 7.5) is routine in clinical and research settings.
Millimeter of Mercury to other pressure units
| Conversion | 1 mmHg equals |
|---|---|
| millimeter of mercury to pascal | 133.3223874 Pa |
| millimeter of mercury to kilopascal | 0.1333223874 kPa |
| millimeter of mercury to megapascal | 0.0001333223874 MPa |
| millimeter of mercury to psi | 0.01933677746 psi |
| millimeter of mercury to bar | 0.001333223874 bar |
| millimeter of mercury to millibar | 1.333223874 mbar |
| millimeter of mercury to decibar | 0.01333223874 dbar |
| millimeter of mercury to torr | 1.000000142 Torr |
| millimeter of mercury to millimeter of water | 13.5951 mmH₂O |
| millimeter of mercury to centimeter of water | 1.35951 cmH₂O |
| millimeter of mercury to inch of water | 0.5352401575 inH₂O |
| millimeter of mercury to inch of water (60 °F) | 0.5357755482 inH₂O (60 °F) |
| millimeter of mercury to inch of mercury | 0.03937007874 inHg |
| millimeter of mercury to atmosphere | 0.001315789661 atm |
| millimeter of mercury to barye | 1333.223874 Ba |
Frequently asked questions
How do I convert a blood gas value from mmHg to kPa?
Multiply by 0.1333: a PaO₂ of 100 mmHg is 13.33 kPa.
How many kilopascals are in 1 millimeter of mercury?
1 mmHg = 0.1333223874 kPa.
How do I convert millimeters of mercury to kilopascals?
Multiply the value in mmHg by 0.1333223874, or divide it by 7.500615758. For example, 15 mmHg × 0.1333223874 = 1.999835811 kPa.
Is the mmHg to kPa conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "millimeter of mercury, conventional (mmHg)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Millimeters of Mercury to Kilopascals. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/millimeter-of-mercury-to-kilopascal/
IEEE
Scientific Converters, "Convert Millimeters of Mercury to Kilopascals," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-mercury-to-kilopascal/