Standard Resistor Values
Standard resistor values follow the IEC 60063 specification for the E6, E12, E24, E48, E96 and E192 series that include 6, 12, 24, 96, and 192 different values per decade. The values increase in a geometrical progression, so that each value is greater than its predecessor by a fixed multiplier chosen to match the tolerance of the range and in general follow the following equation:
where d=decade (..,1,10,100,1000,..), i=0..(E-1) and E=6,12, 24, 48, 96, or 192
Note that the E6,E12,and E24 series contain several values, shaded red in the table below, that do not follow the above equation.