Blood gases & acid-base

pO2 unit converter

Partial pressure of oxygen in blood (blood gas)

Also known as: PaO2, Partial pressure of oxygen, Oxygen tension, Arterial oxygen tension, Sauerstoffpartialdruck, Pression partielle en O2

Converter

Enter a value in any unit and all other units fill in.

kPa mmHg

Worked example

87.5 mmHg (middle of the reference range) = 11.7 kPa

Conversion formulas

kPa	kPa = mmHg × 0.1333	mmHg = kPa × 7.501

Reference range

Unit	Adults
kPa	9.999 – 13.33
mmHg	75 – 100

Source: MedlinePlus (NLM): Blood gases · Last reviewed: 2026-10-14

Note from the source: PaO2 75-100 mmHg (10.0-13.3 kPa) at sea level; lower at altitude (MedlinePlus)

Frequently asked questions

How do I convert pO2 from mmHg to kPa?

kPa = mmHg × 0.1333. In the other direction: mmHg = kPa × 7.501.

What is the reference range of pO2?

For adults the range is 75 – 100 mmHg (MedlinePlus (NLM): Blood gases). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for pO2?

Common units are kPa, mmHg.