SMD Resistor Code Calculator - EIA-96 Decoder

Enter Marking Printed on Resistor Body

Resistor Code

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Quick Reference

3-Digit Code

Code	Value	How It Works
100	10 Ω	10 × 10^0
220	22 Ω	22 × 10^0
471	470 Ω	47 × 10^1
103	10 kΩ	10 × 10^3
474	470 kΩ	47 × 10^4
105	1 MΩ	10 × 10^5
0R0	0 Ω	Jumper / zero ohm

First two digits = significant digits. Third digit = number of zeros. Tolerance typically 5% or 10%.

4-Digit Code

Code	Value	How It Works
1000	100 Ω	100 × 10^0
4700	470 Ω	470 × 10^0
1001	1 kΩ	100 × 10^1
1002	10 kΩ	100 × 10^2
4992	49.9 kΩ	499 × 10^2
1004	1 MΩ	100 × 10^4
0000	0 Ω	Jumper / zero ohm

First three digits = significant digits. Fourth digit = number of zeros. Tolerance typically 1% or better.

EIA-96 Code (1% Precision)

Code	Value	Note
01A	100 Ω	1.00 × 10^2
01B	1 kΩ	1.00 × 10^3
68A	4.87 kΩ	4.87 × 10^3
96D	9.76 MΩ	9.76 × 10^6

Two-digit number = E96 series index. Letter = multiplier (A=x100, B=x1k, C=x10k, D=x100k, X=x1, Y=x10). Used on 0402 and smaller where 4 digits won't fit.

How to Read SMD Resistor Codes

3-Digit Code

The standard code for 5% and 10% tolerance resistors. The first two digits are the significant figures of the resistance. The third digit tells you how many zeros to add.

R = [D1 D2] x 10^D3

Special case: if the third digit is 9, it is a negative multiplier. Example: 4R7 means 4.7 Ω -- the R replaces the decimal point. 0R0 or 000 means a zero-ohm jumper.

4-Digit Code

Used on 1% tolerance resistors where the extra digit provides better resolution. Same principle as the 3-digit code but with three significant figures. Allows unique codes for every E96 value.

R = [D1 D2 D3] x 10^D4

The R-notation also applies: 4R70 means 4.70 Ω. Prefix 0R or 0000 is a zero-ohm jumper.

EIA-96 Code

The solution for 1% precision on tiny packages like 0402 and 0201 where four printed digits are not readable. The code is a 2-digit number plus a letter.

R = E96[nn] x multiplier[L]

The number (01-96) maps to a value in the E96 series table. The letter sets the decade: A=x100, B=x1k, C=x10k, D=x100k. Some manufacturers also use X=x1 and Y=x10 for sub-100-ohm values.