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Base 4 to Base 21

Base 4 to Base 21 Converter

Enter a number in base 4 below to convert it to base 21 instantly.

About These Bases

Base 4

In base 4, each digit position represents a power of 4: the rightmost digit counts individual ones, the next counts groups of 4, the next counts groups of 4×4, and so on — the same place-value idea as base 10, just with 4 distinct digits instead of ten.

Base 21

Base 21 works the same way: the rightmost digit counts ones, the next counts groups of 21, the next counts groups of 21×21, and so on, using 21 distinct digits.

Quick Reference Table

Base 10	Base 4	Base 21
1	1	1
2	2	2
3	3	3
4	10	4
5	11	5
6	12	6
7	13	7
8	20	8
9	21	9
10	22	A
11	23	B
12	30	C
13	31	D
14	32	E
15	33	F
16	100	G
17	101	H
18	102	I
19	103	J
20	110	K
21	111	10
22	112	11
23	113	12
24	120	13
25	121	14
26	122	15
27	123	16
28	130	17
29	131	18
30	132	19
31	133	1A
32	200	1B
33	201	1C
34	202	1D
35	203	1E
36	210	1F
37	211	1G
38	212	1H
39	213	1I
40	220	1J
41	221	1K
42	222	20
43	223	21
44	230	22
45	231	23
46	232	24
47	233	25
48	300	26
49	301	27
50	302	28
51	303	29
52	310	2A
53	311	2B
54	312	2C
55	313	2D
56	320	2E
57	321	2F
58	322	2G
59	323	2H
60	330	2I
61	331	2J
62	332	2K
63	333	30
64	1000	31
70	1012	37
80	1100	3H
90	1122	46
100	1210	4G
200	3020	9B
300	10230	E6
400	12100	J1
500	13310	12H
600	21120	17C
700	22330	1C7
800	30200	1H2
900	32010	20I
1000	33220	25D

View this as a standalone, printable table

Related Base Conversion Calculators

From Base 4

to Base 2
to Base 3
to Base 5
to Base 6
to Base 7
to Base 8
to Base 9
to Base 10
to Base 11
to Base 12
to Base 13
to Base 14
to Base 15
to Base 16
to Base 17
to Base 18
to Base 19
to Base 20
to Base 21
to Base 22
to Base 23
to Base 24
to Base 25
to Base 26
to Base 27
to Base 28
to Base 29
to Base 30
to Base 31
to Base 32
to Base 33
to Base 34
to Base 35
to Base 36
to Base 37
to Base 38
to Base 39
to Base 40
to Base 41
to Base 42
to Base 43
to Base 44
to Base 45
to Base 46
to Base 47
to Base 48
to Base 49
to Base 50
to Base 51
to Base 52
to Base 53
to Base 54
to Base 55
to Base 56
to Base 57
to Base 58
to Base 59
to Base 60
to Base 61
to Base 62
to Base 63
to Base 64

From Base 21

to Base 2
to Base 3
to Base 4
to Base 5
to Base 6
to Base 7
to Base 8
to Base 9
to Base 10
to Base 11
to Base 12
to Base 13
to Base 14
to Base 15
to Base 16
to Base 17
to Base 18
to Base 19
to Base 20
to Base 22
to Base 23
to Base 24
to Base 25
to Base 26
to Base 27
to Base 28
to Base 29
to Base 30
to Base 31
to Base 32
to Base 33
to Base 34
to Base 35
to Base 36
to Base 37
to Base 38
to Base 39
to Base 40
to Base 41
to Base 42
to Base 43
to Base 44
to Base 45
to Base 46
to Base 47
to Base 48
to Base 49
to Base 50
to Base 51
to Base 52
to Base 53
to Base 54
to Base 55
to Base 56
to Base 57
to Base 58
to Base 59
to Base 60
to Base 61
to Base 62
to Base 63
to Base 64

Base 4 to Base 21