Decode the marking on a surface-mount (chip) resistor: 3-digit codes like 103, 4-digit codes like 4702, R-decimal codes like 4R7 and EIA-96 codes like 01C. Or go the other way and get all three codes for a resistance, with the nearest E24 and E96 values.
Last updated:
What do you want to do?
3-digit, 4-digit, R-decimal or EIA-96 (2 digits + letter)
Enter your values to see the result.
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How to use the SMD Resistor Code Calculator
Choose a direction: decode a code or find the code for a value.
Type the code exactly as printed, e.g. 472, 4R7, 1002 or 01C (letters are not case-sensitive).
Or enter the resistance and pick Ω, kΩ or MΩ to get its codes.
Read the resistance, tolerance and the equivalent codes in the other formats.
Use the table of nearby standard values to pick a replacement part.
How SMD resistor codes work
System
Format
Examples
Typical tolerance
3-digit
2 significant digits + number of zeros
220 = 22 Ω · 103 = 10 kΩ · 474 = 470 kΩ
±5% (also 2%, 10%)
4-digit
3 significant digits + number of zeros
1000 = 100 Ω · 4701 = 4.7 kΩ · 1003 = 100 kΩ
±1% or better
R decimal
R marks the decimal point (ohms)
4R7 = 4.7 Ω · R10 = 0.1 Ω · 10R0 = 10 Ω
3 characters ±5%, 4 characters ±1%
EIA-96
E96 index (01–96) + multiplier letter
01C = 10 kΩ · 68X = 49.9 Ω · 30A = 200 Ω
±1%
Jumper
0, 00 or 000
0 Ω link
—
EIA-96 multiplier letters
Letter
Z
Y or R
X or S
A
B or H
C
D
E
F
Multiplier
0.001
0.01
0.1
1
10
100
1,000
10,000
100,000
EIA-96 code table (code → value)
Code
Value
Code
Value
Code
Value
Code
Value
01
100
02
102
03
105
04
107
05
110
06
113
07
115
08
118
09
121
10
124
11
127
12
130
13
133
14
137
15
140
16
143
17
147
18
150
19
154
20
158
21
162
22
165
23
169
24
174
25
178
26
182
27
187
28
191
29
196
30
200
31
205
32
210
33
215
34
221
35
226
36
232
37
237
38
243
39
249
40
255
41
261
42
267
43
274
44
280
45
287
46
294
47
301
48
309
49
316
50
324
51
332
52
340
53
348
54
357
55
365
56
374
57
383
58
392
59
402
60
412
61
422
62
432
63
442
64
453
65
464
66
475
67
487
68
499
69
511
70
523
71
536
72
549
73
562
74
576
75
590
76
604
77
619
78
634
79
649
80
665
81
681
82
698
83
715
84
732
85
750
86
768
87
787
88
806
89
825
90
845
91
866
92
887
93
909
94
931
95
953
96
976
Multiply the value by the letter's multiplier: 47B = 301 × 10 = 3.01 kΩ. Markings vary between manufacturers, so check the datasheet for critical parts.
Frequently asked questions
How do I read a 3-digit SMD resistor code?
The first two digits are significant figures and the third is the number of zeros (power of ten). 103 = 10 × 10³ = 10,000 Ω = 10 kΩ; 472 = 47 × 10² = 4.7 kΩ; 220 = 22 × 10⁰ = 22 Ω.
How do I read a 4-digit SMD resistor code?
The first three digits are significant figures and the fourth is the multiplier. 1002 = 100 × 10² = 10 kΩ; 4701 = 470 × 10¹ = 4.7 kΩ; 1000 = 100 Ω. Four-digit codes are used on precision (typically 1%) resistors.
What does the R mean in 4R7?
R marks the position of the decimal point for values below 10 Ω (3-digit) or 100 Ω (4-digit). 4R7 = 4.7 Ω, R47 = 0.47 Ω, 10R0 = 10.0 Ω and R100 = 0.1 Ω.
How does the EIA-96 code work?
EIA-96 codes have two digits and a letter. The digits (01–96) are an index into the E96 table of 1% values (01 = 100, 02 = 102 … 96 = 976), and the letter is a multiplier: Z = 0.001, Y or R = 0.01, X or S = 0.1, A = 1, B or H = 10, C = 100, D = 1,000, E = 10,000, F = 100,000. So 01C = 100 × 100 = 10 kΩ and 68X = 499 × 0.1 = 49.9 Ω.
What is a resistor marked 000 or 0?
It is a zero-ohm jumper (link). It behaves like a piece of wire and is used to bridge tracks on a PCB with the same pick-and-place process as other parts.
Why do some SMD resistors have no marking?
Very small packages such as 0402 and 0201 are usually too small to print on, so they carry no code at all. You then need to measure them with a multimeter or check the reel label or bill of materials.
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Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.