Needle gauge comparison chart

Hypodermic needles are available in a wide variety of sizes described by gauge numbers. Smaller gauge numbers indicate larger diameter needles.

Needle	Nominal O.D.			Nominal I.D.
Gauge	mm	inches	tol. (in.)	mm	inches	tol. (in.)
10	3.404	0.1340	±0.0010	2.692	0.1060	±0.0020
11	3.048	0.1200	"	2.388	0.0940	"
12	2.769	0.1090	"	2.159	0.0850	"
13	2.413	0.0950	"	1.803	0.0710	"
14	2.108	0.0830	"	1.600	0.0630	"
15	1.829	0.0720	±0.0005	1.372	0.0540	±0.0015
16	1.651	0.0650	"	1.194	0.0470	"
17	1.473	0.0580	"	1.067	0.0420	"
18	1.270	0.0500	"	0.838	0.0330	"
19	1.067	0.0420	"	0.686	0.0270	"
20	0.902	0.0355	+0.0005 Additional recommended knowledge How to ensure accurate weighing results every day? Guide to balance cleaning: 8 simple steps How to quickly check pipettes? -0.0000	0.584	0.0230	+0.0015 -0.0000
21	0.813	0.0320	"	0.495	0.0195	"
22	0.711	0.0280	"	0.394	0.0155	"
22s	0.711	0.0280	"	0.140	0.0055	"
23	0.635	0.0250	"	0.318	0.0125	"
24	0.559	0.0220	"	0.292	0.0115	"
25	0.508	0.0200	"	0.241	0.0095	"
25s	0.508	0.0200	"	0.140	0.0055	"
26	0.457	0.0180	"	0.241	0.0095	"
26s	0.467	0.0184	"	0.114	0.0045	"
27	0.406	0.0160	"	0.191	0.0075	"
28	0.356	0.0140	"	0.165	0.0065	"
29	0.330	0.0130	"	0.165	0.0065	"
30	0.305	0.0120	"	0.140	0.0055	"
31	0.254	0.0100	"	0.114	0.0045	"
32	0.229	0.0090	"	0.089	0.0035	"
33	0.203	0.0080	"	0.089	0.0035	"

See also