Heart & coagulation

CK unit converter

Creatine kinase (muscle damage enzyme)

Also known as: CPK, Creatine kinase, Creatine phosphokinase, Kreatinkinase, Creatina quinasa, Creatinfosfoquinasa

Converter

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

µkat/L U/L

Worked example

172.5 U/L (middle of the reference range) = 2.88 µkat/L

Conversion formulas

µkat/L	µkat/L = U/L × 0.01667	U/L = µkat/L × 60

Reference range

Unit	Adults	Men	Women
µkat/L	0.4167 – 5.333	0.6667 – 5.333	0.4167 – 3.333
U/L	25 – 320	40 – 320	25 – 200

Source: Age, sex and ethnicity changes in creatine kinase (Clin Med 2026), quoting UK Pathology Harmony intervals · Last reviewed: 2026-10-14

Note from the source: UK Pathology Harmony: men 40-320 IU/L, women 25-200 IU/L, derived mainly in White Caucasian cohorts; upper limits are higher in Black adults (about 390 in women, 760 in men)

Frequently asked questions

How do I convert CK from U/L to µkat/L?

µkat/L = U/L × 0.01667. In the other direction: U/L = µkat/L × 60.

What is the reference range of CK?

For adults the range is 25 – 320 U/L (Age, sex and ethnicity changes in creatine kinase (Clin Med 2026), quoting UK Pathology Harmony intervals). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for CK?

Common units are µkat/L, U/L.