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Voltage divider calculator

In electronics design, one is often confronted with voltage dividers. For example, when designing OPamp-based circuits you almost always end up with design equations that give you some resistor ratio. However, finding a pair a resistors can be difficult. So many designers just use resistors from the E96 series because they aren't aware that there is a simple solution for these troubles.

This tool determines the best pair of resistors from the given E series. It's surprising what can be done with E12 and E24 resistors! Many designers have E12 and E24 in stock, so this can save lots of time when you're testing an idea. The resistor values are printed together with the rings according to the standard color code.

Please note that the required ratio is the ratio of the resistor values. Don't enter the voltage ratio of a voltage divider.

Ratio of the resistors R1 : R2:
Series
Maximum acceptable deviation(in %)
R1R2rel. deviation (in %)
330
     
1000
     
1.0101
270
     
820
     
1.2346
390
     
1200
     
2.5641
220
     
680
     
3.0303
180
     
560
     
3.7037
150
     
470
     
4.4444
470
     
1500
     
6.383
560
     
1800
     
7.1429
680
     
2200
     
7.8431
120
     
330
     
8.3333
820
     
2700
     
9.7561
100
     
270
     
10

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