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Resistors
are one of the four fundamental types of passive electronic components; the other three are the
inductor, the capacitor,
and the memristor. The basic
unit of resistance is the ohm (Ω).
Standard base resistor values are given in the following tables for the most commonly used tolerances
(1%, 2%, 5%, 10%), along with typically available resistance ranges. To determine values
other than the base, multiply the base value by 1, 10, 100, 1k, or 10k.
Standard
resistor values are calculated using the simple formula given below. Round the results to the proper number of significant
figures (three for 1% and 2%, two for 5% and 10%). As the chart at the right shows
(created in Excel), plotting the values on a logarithmic scale results in a
straight line due to the exponential in the equation.
 
Example: Calculations indicate the need for a 355 kΩ resistor and a tolerance of 1%. Look
in the 1% table and select the 35.7 value (the nearest available standard value). Multiply
by 10,000 to convert to 357 kΩ.
10.0 |
10.2 |
10.5 |
10.7 |
11.0 |
11.3 |
11.5 |
11.8 |
12.1 |
12.4 |
12.7 |
13.0 |
13.3 |
13.7 |
14.0 |
14.3 |
14.7 |
15.0 |
15.4 |
15.8 |
16.2 |
16.5 |
16.9 |
17.4 |
17.8 |
18.2 |
18.7 |
19.1 |
19.6 |
20.0 |
20.5 |
21.0 |
21.5 |
22.1 |
22.6 |
23.2 |
23.7 |
24.3 |
24.9 |
25.5 |
26.1 |
26.7 |
27.4 |
28.0 |
28.7 |
29.4 |
30.1 |
30.9 |
31.6 |
32.4 |
33.2 |
34.0 |
34.8 |
35.7 |
36.5 |
37.4 |
38.3 |
39.2 |
40.2 |
41.2 |
42.2 |
43.2 |
44.2 |
45.3 |
46.4 |
47.5 |
48.7 |
49.9 |
51.1 |
52.3 |
53.6 |
54.9 |
56.2 |
57.6 |
59.0 |
60.4 |
61.9 |
63.4 |
64.9 |
66.5 |
68.1 |
69.8 |
71.5 |
73.2 |
75.0 |
76.8 |
78.7 |
80.6 |
82.5 |
84.5 |
86.6 |
88.7 |
90.9 |
93.1 |
95.3 |
97.6 |
10.0 |
10.5 |
11.0 |
11.5 |
12.1 |
12.7 |
13.3 |
14.0 |
14.7 |
15.4 |
16.2 |
16.9 |
17.8 |
18.7 |
19.6 |
20.5 |
21.5 |
22.6 |
23.7 |
24.9 |
26.1 |
27.4 |
28.7 |
30.1 |
31.6 |
33.2 |
34.8 |
36.5 |
38.3 |
40.2 |
42.2 |
44.2 |
46.4 |
48.7 |
51.1 |
53.6 |
56.2 |
59.0 |
61.9 |
64.9 |
68.1 |
71.5 |
75.0 |
78.7 |
82.5 |
86.6 |
90.9 |
95.3 |
10 |
11 |
12 |
13 |
15 |
16 |
18 |
20 |
22 |
24 |
27 |
30 |
33 |
36 |
39 |
43 |
47 |
51 |
56 |
62 |
68 |
75 |
82 |
91 |
10 |
12 |
15 |
18 |
22 |
27 |
33 |
39 |
47 |
56 |
68 |
82 |
|