Pressure converter
mmHg to Kilopascals
mmHg and Kilopascals measure the same quantity in different unit systems. The relationship is 1 mmHg = 0.13332239 kPa, which gives 0.13332239 kPa per mmHg. Below you can convert any value, check a worked example and read the full chart.
Formula 1 mmHg = 0.13332239 kPa
Need the other direction? Kilopascals to mmHg.
How to convert mmHg to Kilopascals
One millimetre of mercury is about 133.322 pascals and is used in medicine. A kilopascal is 1,000 pascals and is common in weather and engineering.
To convert mmHg to Kilopascals, multiply the value in mmHg by 0.13332239. For example, 10 mmHg × 0.13332239 = 1.333224 kPa. This works because the ratio between the two units is constant for every value in pressure.
Worked examples
| mmHg | kPa |
|---|---|
| 1 mmHg | 0.13332239 kPa |
| 2.5 mmHg | 0.33330597 kPa |
| 5 mmHg | 0.66661194 kPa |
| 10 mmHg | 1.333224 kPa |
| 25 mmHg | 3.33306 kPa |
| 50 mmHg | 6.666119 kPa |
| 100 mmHg | 13.332239 kPa |
Reverse conversion
| kPa | mmHg |
|---|---|
| 1 kPa | 7.500616 mmHg |
| 5 kPa | 37.503079 mmHg |
| 10 kPa | 75.006158 mmHg |
| 25 kPa | 187.515394 mmHg |
| 50 kPa | 375.030788 mmHg |
| 100 kPa | 750.061576 mmHg |
When this conversion is useful
This is the calculation you need when you are inflating a tyre, reading a barometer or checking an engineering spec. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 mmHg is 133.322387 kPa.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
mmHg to kPa conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| mmHg (mmHg) | Kilopascals (kPa) |
|---|---|
| 1 mmHg | 0.13332239 kPa |
| 2 mmHg | 0.26664477 kPa |
| 3 mmHg | 0.39996716 kPa |
| 4 mmHg | 0.53328955 kPa |
| 5 mmHg | 0.66661194 kPa |
| 6 mmHg | 0.79993432 kPa |
| 7 mmHg | 0.93325671 kPa |
| 8 mmHg | 1.066579 kPa |
| 9 mmHg | 1.199901 kPa |
| 10 mmHg | 1.333224 kPa |
| 11 mmHg | 1.466546 kPa |
| 12 mmHg | 1.599869 kPa |
| 13 mmHg | 1.733191 kPa |
| 14 mmHg | 1.866513 kPa |
| 15 mmHg | 1.999836 kPa |
| 16 mmHg | 2.133158 kPa |
| 17 mmHg | 2.266481 kPa |
| 18 mmHg | 2.399803 kPa |
| 19 mmHg | 2.533125 kPa |
| 20 mmHg | 2.666448 kPa |
| 21 mmHg | 2.79977 kPa |
| 22 mmHg | 2.933093 kPa |
| 23 mmHg | 3.066415 kPa |
| 24 mmHg | 3.199737 kPa |
| 25 mmHg | 3.33306 kPa |
| 26 mmHg | 3.466382 kPa |
| 27 mmHg | 3.599704 kPa |
| 28 mmHg | 3.733027 kPa |
| 29 mmHg | 3.866349 kPa |
| 30 mmHg | 3.999672 kPa |
| 31 mmHg | 4.132994 kPa |
| 32 mmHg | 4.266316 kPa |
| 33 mmHg | 4.399639 kPa |
| 34 mmHg | 4.532961 kPa |
| 35 mmHg | 4.666284 kPa |
| 36 mmHg | 4.799606 kPa |
| 37 mmHg | 4.932928 kPa |
| 38 mmHg | 5.066251 kPa |
| 39 mmHg | 5.199573 kPa |
| 40 mmHg | 5.332895 kPa |
| 41 mmHg | 5.466218 kPa |
| 42 mmHg | 5.59954 kPa |
| 43 mmHg | 5.732863 kPa |
| 44 mmHg | 5.866185 kPa |
| 45 mmHg | 5.999507 kPa |
| 46 mmHg | 6.13283 kPa |
| 47 mmHg | 6.266152 kPa |
| 48 mmHg | 6.399475 kPa |
| 49 mmHg | 6.532797 kPa |
| 50 mmHg | 6.666119 kPa |
| 60 mmHg | 7.999343 kPa |
| 70 mmHg | 9.332567 kPa |
| 80 mmHg | 10.665791 kPa |
| 90 mmHg | 11.999015 kPa |
| 100 mmHg | 13.332239 kPa |
Frequently asked questions
How many Kilopascals are in 1 mmHg?
1 mmHg equals 0.13332239 kPa.
How do I convert mmHg to Kilopascals?
Multiply the mmHg value by 0.13332239. Example: 25 mmHg = 3.33306 kPa.
What is 2.5 mmHg in kPa?
2.5 mmHg = 0.33330597 kPa.
Is the mmHg to kPa conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.