Practical Electronics/Preferred Values

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Preferred values are a series of numbers between a power of ten and the next, each of which has a fixed ratio with the previous number. For more information, see the section in resistors. Commonly, the E12 is used for resistors, and the E6 series is used for capacitors, although if you use more accurate components, different systems may be used.

The E-series of preferred values are as follows:

E6  ( 20%):  10      15      22      33      47      68
E12 ( 10%):  10  12  15  18  22  27  33  39  47  56  68  82
E24 (  5%):  10  11  12  13  15  16  18  20  22  24  27  30 
             33  36  39  43  47  51  56  62  68  75  82  91
E96 (  1%): 100 102 105 107 110 113 115 118 121 124 127 130
            133 137 140 143 147 150 154 158 162 165 169 174
            178 182 187 191 196 200 205 210 215 221 226 232
            237 243 249 255 261 267 274 280 287 294 301 309
            316 324 332 340 348 357 365 374 383 392 402 412
            422 432 442 453 464 475 487 499 511 523 536 549
            562 576 590 604 619 634 649 665 681 698 715 732
            750 768 787 806 825 845 866 887 909 931 953 976
E192 (0.5%) 100 101 102 104 105 106 107 109 110 111 113 114
            115 117 118 120 121 123 124 126 127 129 130 132
            133 135 137 138 140 142 143 145 147 149 150 152
            154 156 158 160 162 164 165 167 169 172 174 176
            178 180 182 184 187 189 191 193 196 198 200 203
            205 208 210 213 215 218 221 223 226 229 232 234
            237 240 243 246 249 252 255 258 261 264 267 271
            274 277 280 284 287 291 294 298 301 305 309 312
            316 320 324 328 332 336 340 344 348 352 357 361
            365 370 374 379 383 388 392 397 402 407 412 417
            422 427 432 437 442 448 453 459 464 470 475 481
            487 493 499 505 511 517 523 530 536 542 549 556
            562 569 576 583 590 597 604 612 619 626 634 642
            649 657 665 673 681 690 698 706 715 723 732 741
            750 759 768 777 787 796 806 816 825 835 845 856
            866 876 887 898 909 919 931 942 953 965 976 988

Further reading[edit]