SMD

SMD Resistor Code Calculator

Decode the 3-digit, 4-digit or EIA-96 code printed on a chip resistor. Enter a resistance to see how each system would mark it.

Code on the resistor Find the code for a value Ω

How to read the codes

In a 3-digit code the first two digits are the value and the last digit is the number of zeros, so 472 is 47 followed by two zeros, or 4.7 kΩ. A 4-digit code has three value digits and is used on 1% parts. An R marks the decimal point, so 4R7 is 4.7 Ω. Very small chips such as 0402 use EIA-96: two digits plus a letter, where 01C is 10 kΩ.

Worked examples

4702: the first three digits are 470 and the 2 adds two zeros → 470 × 10² = 47 kΩ (4-digit, usually ±1%)
30C: entry 30 in the EIA-96 table is 200, and C is ×100 → 200 × 100 = 20 kΩ

Common 3-digit codes

3-digit code	Value
100	10 Ω
101	100 Ω
102	1 kΩ
103	10 kΩ
104	100 kΩ
105	1 MΩ
221	220 Ω
331	330 Ω
471	470 Ω
472	4.7 kΩ
4R7	4.7 Ω
R47	470 mΩ

EIA-96 code table (first two digits → value)

Code	Value	Code	Value	Code	Value	Code	Value
01	100	25	178	49	316	73	562
02	102	26	182	50	324	74	576
03	105	27	187	51	332	75	590
04	107	28	191	52	340	76	604
05	110	29	196	53	348	77	619
06	113	30	200	54	357	78	634
07	115	31	205	55	365	79	649
08	118	32	210	56	374	80	665
09	121	33	215	57	383	81	681
10	124	34	221	58	392	82	698
11	127	35	226	59	402	83	715
12	130	36	232	60	412	84	732
13	133	37	237	61	422	85	750
14	137	38	243	62	432	86	768
15	140	39	249	63	442	87	787
16	143	40	255	64	453	88	806
17	147	41	261	65	464	89	825
18	150	42	267	66	475	90	845
19	154	43	274	67	487	91	866
20	158	44	280	68	499	92	887
21	162	45	287	69	511	93	909
22	165	46	294	70	523	94	931
23	169	47	301	71	536	95	953
24	174	48	309	72	549	96	976

EIA-96 multiplier letters

Letter	Multiplier
Z	×0.001
Y / R	×0.01
X / S	×0.1
A	×1
B / H	×10
C	×100
D	×1000
E	×10000
F	×100000

Frequently asked questions

What does 103 mean on an SMD resistor?

It is 10 followed by three zeros: 10,000 Ω, or 10 kΩ. The same value is marked 1002 in the 4-digit system and 01C in EIA-96.

What is a resistor marked 000 or 0?

It is a 0 Ω jumper: a resistor-sized link used to connect two points on a board, often to select an option or to hop one trace over another.

Code	Value	Code	Value	Code	Value	Code	Value
01	100	25	178	49	316	73	562
02	102	26	182	50	324	74	576
03	105	27	187	51	332	75	590
04	107	28	191	52	340	76	604
05	110	29	196	53	348	77	619
06	113	30	200	54	357	78	634
07	115	31	205	55	365	79	649
08	118	32	210	56	374	80	665
09	121	33	215	57	383	81	681
10	124	34	221	58	392	82	698
11	127	35	226	59	402	83	715
12	130	36	232	60	412	84	732
13	133	37	237	61	422	85	750
14	137	38	243	62	432	86	768
15	140	39	249	63	442	87	787
16	143	40	255	64	453	88	806
17	147	41	261	65	464	89	825
18	150	42	267	66	475	90	845
19	154	43	274	67	487	91	866
20	158	44	280	68	499	92	887
21	162	45	287	69	511	93	909
22	165	46	294	70	523	94	931
23	169	47	301	71	536	95	953
24	174	48	309	72	549	96	976

Code	Value	Code	Value	Code	Value	Code	Value
01	100	25	178	49	316	73	562
02	102	26	182	50	324	74	576
03	105	27	187	51	332	75	590
04	107	28	191	52	340	76	604
05	110	29	196	53	348	77	619
06	113	30	200	54	357	78	634
07	115	31	205	55	365	79	649
08	118	32	210	56	374	80	665
09	121	33	215	57	383	81	681
10	124	34	221	58	392	82	698
11	127	35	226	59	402	83	715
12	130	36	232	60	412	84	732
13	133	37	237	61	422	85	750
14	137	38	243	62	432	86	768
15	140	39	249	63	442	87	787
16	143	40	255	64	453	88	806
17	147	41	261	65	464	89	825
18	150	42	267	66	475	90	845
19	154	43	274	67	487	91	866
20	158	44	280	68	499	92	887
21	162	45	287	69	511	93	909
22	165	46	294	70	523	94	931
23	169	47	301	71	536	95	953
24	174	48	309	72	549	96	976

Code	Value	Code	Value	Code	Value	Code	Value
01	100	25	178	49	316	73	562
02	102	26	182	50	324	74	576
03	105	27	187	51	332	75	590
04	107	28	191	52	340	76	604
05	110	29	196	53	348	77	619
06	113	30	200	54	357	78	634
07	115	31	205	55	365	79	649
08	118	32	210	56	374	80	665
09	121	33	215	57	383	81	681
10	124	34	221	58	392	82	698
11	127	35	226	59	402	83	715
12	130	36	232	60	412	84	732
13	133	37	237	61	422	85	750
14	137	38	243	62	432	86	768
15	140	39	249	63	442	87	787
16	143	40	255	64	453	88	806
17	147	41	261	65	464	89	825
18	150	42	267	66	475	90	845
19	154	43	274	67	487	91	866
20	158	44	280	68	499	92	887
21	162	45	287	69	511	93	909
22	165	46	294	70	523	94	931
23	169	47	301	71	536	95	953
24	174	48	309	72	549	96	976