Table of Number Bases: 2 to 36

In base b, the numeral 10 represents b in decimal.

This table uses the conventional digits 0–9 followed by A–Z for values 10–35. Other symbol conventions are possible.

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Positional bases 2–36
Base	Available digits	Decimal 10 written in base	Decimal 100 written in base
2	01	1010	1100100
3	012	101	10201
4	0123	22	1210
5	01234	20	400
6	012345	14	244
7	0123456	13	202
8	01234567	12	144
9	012345678	11	121
10	0123456789	10	100
11	0123456789A	A	91
12	0123456789AB	A	84
13	0123456789ABC	A	79
14	0123456789ABCD	A	72
15	0123456789ABCDE	A	6A
16	0123456789ABCDEF	A	64
17	0123456789ABCDEFG	A	5F
18	0123456789ABCDEFGH	A	5A
19	0123456789ABCDEFGHI	A	55
20	0123456789ABCDEFGHIJ	A	50
21	0123456789ABCDEFGHIJK	A	4G
22	0123456789ABCDEFGHIJKL	A	4C
23	0123456789ABCDEFGHIJKLM	A	48
24	0123456789ABCDEFGHIJKLMN	A	44
25	0123456789ABCDEFGHIJKLMNO	A	40
26	0123456789ABCDEFGHIJKLMNOP	A	3M
27	0123456789ABCDEFGHIJKLMNOPQ	A	3J
28	0123456789ABCDEFGHIJKLMNOPQR	A	3G
29	0123456789ABCDEFGHIJKLMNOPQRS	A	3D
30	0123456789ABCDEFGHIJKLMNOPQRST	A	3A
31	0123456789ABCDEFGHIJKLMNOPQRSTU	A	37
32	0123456789ABCDEFGHIJKLMNOPQRSTUV	A	34
33	0123456789ABCDEFGHIJKLMNOPQRSTUVW	A	31
34	0123456789ABCDEFGHIJKLMNOPQRSTUVWX	A	2W
35	0123456789ABCDEFGHIJKLMNOPQRSTUVWXY	A	2U
36	0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ	A	2S