CK unit converter

Convert CK between U/L, µkat/L and nkat/L. Type in either box. The factors come from our catalog and are checked by code.

AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03

From

1 U/L = 0.0167 µkat/L. Nothing you type here leaves your browser.

The conversion

1 U/L = 0.01667 µkat/LFrom U/L to µkat/L: divide by 60. Back again: multiply by 60.
1 U/L = 16.67 nkat/LFrom U/L to nkat/L: multiply by 16.67. Back again: divide by 16.67.

From zero to about twice the usual upper limit, plus the usual limits themselves.

What labs print as the reference range, by who was tested. Sources for each range are on the CK page.

Usual ranges for CK in U/L, µkat/L and nkat/L
Who	U/L	µkat/L	nkat/L
Men, 1–4	36–323	0.6–5.38	600–5,383
Women, 1–4	33–308	0.55–5.13	550–5,133
Men, 5–6	38–369	0.63–6.15	633–6,150
Women, 5–6	30–304	0.5–5.07	500–5,067
Men, 7–9	36–337	0.6–5.62	600–5,617
Women, 7–9	33–295	0.55–4.92	550–4,917
Men, 10–12	33–333	0.55–5.55	550–5,550
Women, 10–12	28–280	0.47–4.67	467–4,667
Men, 13–18	34–344	0.57–5.73	567–5,733
Women, 13–18	22–246	0.37–4.1	367–4,100
Men, 19–49	26–366	0.43–6.1	433–6,100
Women, 19–49	20–239	0.33–3.98	333–3,983
Men, 50–59	23–325	0.38–5.42	383–5,417
Women, 50–59	21–240	0.35–4	350–4,000
Men, 60–69	22–308	0.37–5.13	367–5,133
Women, 60–69	20–243	0.33–4.05	333–4,050
Men, 70–79	19–278	0.32–4.63	317–4,633
Women, 70–79	18–225	0.3–3.75	300–3,750
Men, 80+	17–247	0.28–4.12	283–4,117
Women, 80+	16–215	0.27–3.58	267–3,583