Using it
Type the marking on the resistor. Three digits (103), four digits (4702), R for a decimal point (4R7) and the two-digits-and-a-letter EIA-96 codes (01C) are all recognised. Swap the boxes to go from a value such as 10k or 4.7 to its codes in all three systems.
Three and four digits
The last digit is how many zeros to add; the digits before it are the value. 103 is 10 followed by three zeros, 10,000 Ω or 10 kΩ. 4702 is 470 followed by two zeros, 47 kΩ. Three-digit codes are usual on 5% resistors and four-digit codes on 1% ones, which need the extra figure.
Under 10 Ω, an R marks the decimal point: 4R7 is 4.7 Ω and R22 is 0.22 Ω. A resistor marked 0, 00 or 000 is a zero-ohm link, used as a jumper wire.
EIA-96
Tiny 1% resistors use a three-character code: two digits giving a position in the E96 series of preferred values, then a letter for the multiplier. 01C is position 1 (100) × 100 = 10 kΩ; 10C is position 10 (124) × 100 = 12.4 kΩ. The code is now part of IEC 60062.
EIA-96 multiplier letters
| Letter | Multiply by |
|---|---|
| Y or S | 0.01 |
| X or R | 0.1 |
| A | 1 |
| B or H | 10 |
| C | 100 |
| D | 1,000 |
| E | 10,000 |
EIA-96 value codes
| Code | Value | Code | Value |
|---|---|---|---|
| 01 | 100 | 49 | 316 |
| 02 | 102 | 50 | 324 |
| 03 | 105 | 51 | 332 |
| 04 | 107 | 52 | 340 |
| 05 | 110 | 53 | 348 |
| 06 | 113 | 54 | 357 |
| 07 | 115 | 55 | 365 |
| 08 | 118 | 56 | 374 |
| 09 | 121 | 57 | 383 |
| 10 | 124 | 58 | 392 |
| 11 | 127 | 59 | 402 |
| 12 | 130 | 60 | 412 |
| 13 | 133 | 61 | 422 |
| 14 | 137 | 62 | 432 |
| 15 | 140 | 63 | 442 |
| 16 | 143 | 64 | 453 |
| 17 | 147 | 65 | 464 |
| 18 | 150 | 66 | 475 |
| 19 | 154 | 67 | 487 |
| 20 | 158 | 68 | 499 |
| 21 | 162 | 69 | 511 |
| 22 | 165 | 70 | 523 |
| 23 | 169 | 71 | 536 |
| 24 | 174 | 72 | 549 |
| 25 | 178 | 73 | 562 |
| 26 | 182 | 74 | 576 |
| 27 | 187 | 75 | 590 |
| 28 | 191 | 76 | 604 |
| 29 | 196 | 77 | 619 |
| 30 | 200 | 78 | 634 |
| 31 | 205 | 79 | 649 |
| 32 | 210 | 80 | 665 |
| 33 | 215 | 81 | 681 |
| 34 | 221 | 82 | 698 |
| 35 | 226 | 83 | 715 |
| 36 | 232 | 84 | 732 |
| 37 | 237 | 85 | 750 |
| 38 | 243 | 86 | 768 |
| 39 | 249 | 87 | 787 |
| 40 | 255 | 88 | 806 |
| 41 | 261 | 89 | 825 |
| 42 | 267 | 90 | 845 |
| 43 | 274 | 91 | 866 |
| 44 | 280 | 92 | 887 |
| 45 | 287 | 93 | 909 |
| 46 | 294 | 94 | 931 |
| 47 | 301 | 95 | 953 |
| 48 | 309 | 96 | 976 |
Questions
What is a 103 resistor?
10 kΩ: 10 followed by three zeros.
What does 01C mean on a resistor?
10 kΩ in the EIA-96 code: value 100 times the C multiplier, 100.
Why is my resistor marked 1002 instead of 103?
Both are 10 kΩ. The four-digit code is used on 1% resistors because it holds a third significant figure.
Sources
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