mmHg to hPa Converter

How to convert millimeters of mercury to hectopascals

FormulahPa = mmHg × 1.333223874

Multiply the value in millimeters of mercury by 1.333223874. To go the other way, multiply by 0.7500615758 (or divide by 1.333223874).

A millimeter of mercury is larger than a hectopascal: one millimeter of mercury contains 1.333223874 hectopascals.

Worked examples

1 millimeter of mercury1 mmHg × 1.333223874 = 1.333223874 hPa
5 millimeters of mercury5 mmHg × 1.333223874 = 6.666119371 hPa
10 millimeters of mercury10 mmHg × 1.333223874 = 13.33223874 hPa
20 millimeters of mercury20 mmHg × 1.333223874 = 26.66447748 hPa
100 millimeters of mercury100 mmHg × 1.333223874 = 133.3223874 hPa

Millimeters of mercury to hectopascals conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Millimeters of mercury to hectopascals: 0.1–10 mmHg
Millimeters of mercury (mmHg)	Hectopascals (hPa)
0.1 mmHg	0.13332239 hPa
0.25 mmHg	0.33330597 hPa
0.5 mmHg	0.66661194 hPa
1 mmHg	1.3332239 hPa
2 mmHg	2.6664477 hPa
3 mmHg	3.9996716 hPa
4 mmHg	5.3328955 hPa
5 mmHg	6.6661194 hPa
6 mmHg	7.9993432 hPa
7 mmHg	9.3325671 hPa
8 mmHg	10.665791 hPa
9 mmHg	11.999015 hPa
10 mmHg	13.332239 hPa

Millimeters of mercury to hectopascals: 12–1,000 mmHg
Millimeters of mercury (mmHg)	Hectopascals (hPa)
12 mmHg	15.998686 hPa
15 mmHg	19.998358 hPa
20 mmHg	26.664477 hPa
25 mmHg	33.330597 hPa
30 mmHg	39.996716 hPa
40 mmHg	53.328955 hPa
50 mmHg	66.661194 hPa
75 mmHg	99.991791 hPa
100 mmHg	133.32239 hPa
250 mmHg	333.30597 hPa
500 mmHg	666.61194 hPa
1,000 mmHg	1,333.2239 hPa

About the units

Millimeter of mercury (mmHg)

The conventional mmHg is 133.322387415 Pa. Blood pressure is measured in mmHg (e.g. 120/80).

Hectopascal (hPa)

One hundred pascals, numerically equal to a millibar. Weather maps show sea-level pressure in hPa (around 1013). One hectopascal equals 100 pascals (Pa).

Frequently asked questions

How many hectopascals are in one millimeter of mercury?

There are 1.333223874 hectopascals in one millimeter of mercury, and this value is exact by definition.

How do I convert millimeters of mercury to hectopascals?

Multiply the number of millimeters of mercury by 1.333223874. For example, 10 mmHg × 1.333223874 = 13.33223874 hPa.

How many millimeters of mercury are in one hectopascal?

One hectopascal equals 0.7500615758 millimeters of mercury. That is the reverse factor, 1 ÷ 1.333223874.

What is 10 millimeters of mercury in hectopascals?

10 mmHg = 13.33223874 hPa.

Is this mmHg to hPa converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.