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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Standard Resistor Values

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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.

 

1% resistor value plot - RF CafeStandard 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.

Standard resistor value equation - RF CafeResistor calculation equation definitions - RF Cafe

 

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.

 

1% Standard Values (EIA E96)
Decade multiples are available from 10.0 Ω through 1.00 MΩ
(also 1.10 MΩ, 1.20 MΩ, 1.30 MΩ, 1.50 MΩ, 1.60 MΩ, 1.80 MΩ, 2.00 MΩ and 2.20 MΩ)
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

 

2% Standard Values (EIA E48)
Decade multiples are available from 10 Ω through 22 MΩ
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

 

5% Standard Values (EIA E24)
Decade multiples are available from 10 Ω through 22 MΩ
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% Standard Values (EIA E12)
Decade multiples are available from 10 Ω through 1 MΩ
10 12 15 18 22 27 33 39 47 56 68 82