SMD Resistor Code Calculator (3-digit, 4-digit, EIA-96)

Read the marking on a surface-mount resistor — 473, 4702, 4R7 or the three-character EIA-96 code — or go the other way and find the marking a maker would print for a value, with the full 96-code table and the multiplier letters.

Last updated 22 Sep 2026

SMD resistor marking

Marking ⇄ resistance

Which way?

Marking system3-digit markings are the usual ±5% parts; 4-digit and EIA-96 are ±1% and better.

First figure

Second figure

Third figure (4-digit and 47R5 only)

Last digit: the multiplier

Where the R sits

EIA-96 code number (1–96)The first two characters of the marking. The table below has all 96.

EIA-96 multiplier letter

Resistance

Resistance unit

The chip resistor drawn with its marking on the top face and the value underneath. In the EIA-96 line the two digits are the code number and the letter is the multiplier.

47kΩExample

A 0603 resistor marked 473

The four SMD marking systems

3 digits: R = (d₁d₂) × 10^d₃ · 4 digits: R = (d₁d₂d₃) × 10^d₄ · R notation: R replaces the decimal point · EIA-96: R = E96[code] × letter multiplier

473: 47 × 10³ = 47 kΩ — the last digit is the number of zeros, not a figure
4702: 470 × 10² = 47 kΩ — three figures, for ±1% parts
4R7: 4.7 Ω — the R is the decimal point (IEC 60062)
01A: code 01 = 100, letter A = ×1, so 100 Ω
E96[code]: the three-figure value at that position in the E96 series: 01 = 100, 02 = 102, … 96 = 976

Worked example

A 0603 resistor marked 473
The first two digits are the figures: 47
The last digit is the multiplier, the number of zeros to add: 3
47 × 10³ = 47,000 Ω = 47 kΩ
The same part in the four-digit system would be marked 4702, and the nearest EIA-96 marking is 66C — code 66 is 475, ×100, so 47.5 kΩ: 47 kΩ is an E24 value but not an E96 one, which is why 1% parts are usually 47.5 kΩ

EIA-96 code numbers and their three figures

The 96 values are the E96 series of IEC 60063. Reproduced from the Bourns CRP0603 and TT Electronics TN004 marking tables and checked against the E96 series itself. Multiply by the letter in the third character.
Code	Figures	Code	Figures	Code	Figures
01	100	33	215	65	464
02	102	34	221	66	475
03	105	35	226	67	487
04	107	36	232	68	499
05	110	37	237	69	511
06	113	38	243	70	523
07	115	39	249	71	536
08	118	40	255	72	549
09	121	41	261	73	562
10	124	42	267	74	576
11	127	43	274	75	590
12	130	44	280	76	604
13	133	45	287	77	619
14	137	46	294	78	634
15	140	47	301	79	649
16	143	48	309	80	665
17	147	49	316	81	681
18	150	50	324	82	698
19	154	51	332	83	715
20	158	52	340	84	732
21	162	53	348	85	750
22	165	54	357	86	768
23	169	55	365	87	787
24	174	56	374	88	806
25	178	57	383	89	825
26	182	58	392	90	845
27	187	59	402	91	866
28	191	60	412	92	887
29	196	61	422	93	909
30	200	62	432	94	931
31	205	63	442	95	953
32	210	64	453	96	976

EIA-96 multiplier letters

A, B, C, D, E and F are used by every maker. The sub-ohm alternates vary: most tables pair R with Y and S with X, but TT Electronics’ TN004 pairs them the other way round, so check a sub-ohm marking against the maker’s own sheet.
Letter	Also printed as	Multiplier	Range it covers
Z	—	×0.001	100 mΩ to 976 mΩ
Y	or R	×0.01	1 Ω to 9.76 Ω
X	or S	×0.1	10 Ω to 97.6 Ω
A	—	×1	100 Ω to 976 Ω
B	or H	×10	1 kΩ to 9.76 kΩ
C	—	×100	10 kΩ to 97.6 kΩ
D	—	×1,000	100 kΩ to 976 kΩ
E	—	×10,000	1 MΩ to 9.76 MΩ
F	—	×100,000	10 MΩ to 97.6 MΩ

Common values in each marking system

Computed by this page. An asterisk means the value is not an E96 value, so the EIA-96 code shown is the nearest one — 47 kΩ is an E24 value, and the nearest E96 value, 47.5 kΩ, is what a 1% part in that slot actually is.
Value	3-digit	4-digit	R notation	EIA-96
100 mΩ	—	—	R1	01Z
1 Ω	—	—	1R0	01Y
4.7 Ω	—	—	4R7	66Y*
10 Ω	100	—	10R	01X
47 Ω	470	—	47R	66X*
100 Ω	101	1000	—	01A
220 Ω	221	2200	—	34A*
470 Ω	471	4700	—	66A*
1 kΩ	102	1001	—	01B
2.2 kΩ	222	2201	—	34B*
4.7 kΩ	472	4701	—	66B*
10 kΩ	103	1002	—	01C
47 kΩ	473	4702	—	66C*
100 kΩ	104	1003	—	01D
1 MΩ	105	1004	—	01E
10 MΩ	106	1005	—	01F

Reading the marking on a surface-mount resistor

A chip resistor has no room for colour bands, so its value is printed on the top face in three or four characters — when it is printed at all: 0402 and smaller parts are usually blank, and the only way to know what one is, is to know which reel it came off. Four systems are in use, and the first job is to work out which one you are looking at.

Three digits. The first two are the figures and the third is the number of zeros to add. 473 is 47 followed by three zeros, 47 kΩ. 102 is 1,000 Ω. The trap — and it is the commonest mistake made with SMD resistors — is a last digit of 0, which means no zeros: 330 is 33 Ω, not 330 Ω, and 470 is 47 Ω. A 330 Ω part is marked 331. Three figures can only express E24 values, so a 3-digit marking almost always means a ±5% part.

Four digits. The same idea with three figures: 4702 is 470 followed by two zeros, 47 kΩ, and 1331 is 1.33 kΩ. Three figures are what the E96 series needs, so a 4-digit marking is a ±1% part. This is the system you will see on 0805 and 1206 precision resistors, where there is room for four characters.

R notation. Below 10 Ω a digit code cannot express a fraction, so an R takes the place of the decimal point, exactly as IEC 60062 defines it for printed markings: 4R7 is 4.7 Ω, R47 is 0.47 Ω, 1R0 is 1 Ω. Above 10 Ω it is used for precision values that need a decimal: 34R8 is 34.8 Ω. The same standard gives K and M the same job at higher values, which is where part numbers like 4K7 and 1M0 come from.

EIA-96, and why it exists. A 0603 part is about 1.6 mm long. Three figures plus a multiplier will not fit legibly, so precision parts use a two-digit code for the value and a single letter for the multiplier. The code is simply the position of the value in the E96 series: 01 is 100, 02 is 102, 33 is 215, 66 is 475, 96 is 976. The letter multiplies: A is ×1, B ×10, C ×100, D ×1,000, E ×10,000, F ×100,000, and below an ohm X (or S) is ×0.1, Y (or R) ×0.01 and Z ×0.001. So 01A is 100 Ω, 09B is 1.21 kΩ and 07D is 115 kΩ. Both tables above are reproduced from manufacturers’ own marking sheets and checked against the E96 series itself.

Two things the marking never tells you. It does not give the tolerance — 473 could be a ±5% or a ±1% part, and only the part number says which — and it does not give the power rating, which comes from the case size (about 1/16 W for 0402, 1/10 W for 0603, 1/8 W for 0805, 1/4 W for 1206). It also cannot be read once the part is on the board if it went down upside-down, and a value marked in one system may look valid in another: 470 is 47 Ω as a 3-digit code but would be an impossible 4-digit code. If the marking does not resolve to a standard value, you have probably read it in the wrong system, or the part is not a resistor at all.

For through-hole parts with colour bands use the resistor colour code calculator; for the three-digit code on ceramic capacitors, which looks identical but means picofarads, the capacitor code calculator. Once you know the value, the Ohm’s law calculator gives the current and power, and the series and parallel resistor calculator will get you to an awkward value from the parts you have.

Frequently asked questions

What does 473 mean on an SMD resistor?

47 followed by three zeros: 47,000 Ω, or 47 kΩ. The first two digits are the figures and the third is the number of zeros.

Is a resistor marked 330 equal to 330 ohms?

No — it is 33 Ω. The last digit is the number of zeros, and zero zeros means ×1. A 330 Ω chip resistor is marked 331.

What does the R mean on an SMD resistor?

It stands in for the decimal point, because a printed decimal point can be lost. 4R7 is 4.7 Ω, R47 is 0.47 Ω, 34R8 is 34.8 Ω. IEC 60062 defines the same use for K and M.

How do you read an EIA-96 resistor code?

The two digits are a position in the E96 series (01 = 100, 66 = 475, 96 = 976) and the letter is the multiplier (A = ×1, B = ×10, C = ×100, D = ×1,000). 01A is 100 Ω, 09B is 1.21 kΩ.

Why are 1% SMD resistors marked with letters?

Because ±1% values come from the 96-value E96 series, which needs three figures, and a 0603 part has room for three characters in total. Two digits plus a letter carry the same information in less space.

Does the marking tell me the tolerance?

No. Only the part number does. As a rule of thumb a 3-digit marking is a ±5% E24 part and a 4-digit or EIA-96 marking is ±1% or better, but that is a convention, not a guarantee.

Why is there no EIA-96 code for 47 kΩ?

Because 47 kΩ is an E24 value, not an E96 one: the E96 series goes 46.4, 47.5. A ±1% part in that slot is 47.5 kΩ, marked 66C.

Related calculators

References

Bourns. CRP0603 Series — Precision Chip Resistors data sheet. EIA-96 marking: the 96-code table (01 = 100 … 96 = 976) and the multiplier letters Y = 10⁻², X = 10⁻¹, A = 10⁰, B = 10¹, C = 10², D = 10³, E = 10⁴, F = 10⁵.
TT Electronics. Technical Note TN004: Methods for Marking Values on Resistors. The 3-digit (472 = 4K7), 4-digit (1331 = 1K33) and R-notation (4R7 = 4.7 Ω, 34R8 = 34.8 Ω) systems and the EIA-96 code table.
IEC 60063:2015. Preferred number series for resistors and capacitors (the E6, E12, E24, E48, E96 and E192 series). International Electrotechnical Commission.
IEC 60062:2016. Marking codes for resistors and capacitors, edition 6.0: the R (and K, M) decimal-point notation and the three-digit capacitor code. International Electrotechnical Commission.