Standard Resistor Values

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Standard base resistor values are given in the following tables for the most commonly used tolerances (1%, 5%, 10%), along with typically available resistance ranges. To determine values other than the base, multiply the base value by 10, 100, 1 000 or 10 000.

 


Example:Calculations indicate the need for a 355 kW 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 kW.
1% Standard Values
Decade multiples are available from 10.0
W through 1.00 MW
(also 1.10 M
W, 1.20 MW, 1.30 MW, 1.50 MW, 1.60 MW, 1.80 MW, 2.00 MW and 2.20 MW)
10.010.210.510.711.011.311.511.812.112.412.713.0
13.313.714.014.314.715.015.415.816.216.516.917.4
17.818.218.719.119.620.020.521.021.522.122.623.2
23.724.324.925.526.126.727.428.028.729.430.130.9
31.632.433.234.034.835.736.537.438.339.240.241.2
42.243.244.245.346.447.548.749.951.152.353.654.9
56.257.659.060.461.963.464.966.568.169.871.573.2
75.076.878.780.682.584.586.688.790.993.195.397.6
1% resistor value plotStandard resistor values are calculated using the simple formula given below. Round the results to the proper number of significant figures (3 for 1% and 2%, 2 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.

Standard resistor value equation

5% Standard Values
Decade multiples are available from 10
W through 22 MW

101112131516182022242730
333639434751566268758291
 

10% Standard Values
Decade multiples are available from 10
W through 1 MW

101215182227333947566882