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Resistors are available in several series of fixed decade values, the number of values provided with each series being governed by the tolerance involved. In order to cover the full range of resistance values using resistors having a ±20% tolerance, six basic values, known as the E6 series, are provided. More values are available in the E12 series which offers a tolerance of ±10%. The E24 series for resistors of ±5% tolerance provides no less than 24 basic values. In all three cases, decade multiples of the basic series are available (i.e., x1, x10, x100, x1k, x10k, x100k and x1M).
| E6 | E12 | E24 |
| 1.0 | 1.0 | 1.0 |
| | | 1.1 |
| | 1.2 | 1.2 |
| | | 1.3 |
| 1.5 | 1.5 | 1.5 |
| | | 1.6 |
| | 1.8 | 1.8 |
| | | 2.0 |
| 2.2 | 2.2 | 2.2 |
| | | 2.4 |
| | 2.7 | 2.7 |
| | | 3.0 |
| 3.3 | 3.3 | 3.3 |
| | | 3.6 |
| | 3.9 | 3.9 |
| | | 4.3 |
| 4.7 | 4.7 | 4.7 |
| | | 5.1 |
| | 5.6 | 5.6 |
| | | 6.2 |
| 6.8 | 6.8 | 6.8 |
| | | 7.5 |
| | 8.2 | 8.2 |
| | | 9.1 |
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