The series are sometimes referred to by the tolerance, the two being related as follows: E3: 50% tolerance. E6: 20% tolerance. E12: 10% tolerance. E24: 5% tolerance. E48: 2% tolerance. E96: 1% tolerance. E192: less than 1% tolerance. When designing a circuit you need to round calculated resistor values to a preferred value. Technical Note TN005 -Standard Values for Resistors Standard Resistor Values and Commonly Associated Tolerances 2%, 5% 10% 20% E24 E12 E6 1 1.78 3.16 5.62 1 3.16 1 1 1 1 49 97 145 1.01 1.8 3.2 5.69 1.02 3.24 1.1 1.2 1.5 2 50 98 146 1.02 1.82 3.24 5.76 1.05 3.32 1.2 1.5 2.2 3 51 99 147 Table of all nominal resistance values of resistors, which conform to E24 series. E24. Nominal values of resistances. 1.0. 0.1 Ω. 1 Ω. 10 Ω. 100 Ω. 1k Ω. Standard values of nominal resistance are taken from the E24 series for resistors with a tolerance of ±5%, and E24+E96 series for resistors with a tolerance of ±1%. The values of the E24 / E96 series are in accordance with "IEC publication 60063" Mounting: This helps the supplier with stocking different values. Resistors produced by different manufacturers are compatible for the same designs because of the use of standard values. Standard Resistor Value Series and Tolerances. The standard E3, E6, E12, E24, E48 and E96 resistor values are listed below. The other series within the range of the E-series are the E12 and E24 series whose values are calculated at the interval of every ten years and consists of twelve and twenty-four values for a tolerance level of ±10% and ±5% respectively. .

e24 series resistor values