Electronics · Free Calculator
Standard Resistor Values Calculator (E Series)
Enter the resistance your design needs to get the nearest standard value you can buy, plus the next value up and down.
E6 and E12E24 (5 %)E96 (1 %)Error %
Nearest E24 value5.1 kΩ
Error+2.00 %
Next lower4.7 kΩ (−6.00 %)
Next higher5.1 kΩ (+2.00 %)
How this result was calculated
- E24 has 24 values per decade spaced by about 10.1 %.
E24 values (one decade)
| Values |
|---|
| 1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0 |
| 2.2, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9, 4.3 |
| 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1 |
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What the E Series Are
IEC 60063 defines preferred number series so that each value is a fixed ratio above the previous one.
Valuek ≈ 10^(k ÷ n), rounded, for k = 0 … n − 1
E6, E12, E24 use 2 significant figures, E96 uses 3
E6, E12, E24 use 2 significant figures, E96 uses 3
Worked example
A design needs 5 kΩ. E12 gives 4.7 kΩ (−6 %), E24 gives 5.1 kΩ (+2 %) and E96 gives 4.99 kΩ (−0.2 %).
Key insight: the series spacing matches the tolerance, so a 5 % E24 part always overlaps its neighbours and any value can be reached within the tolerance band.
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Frequently Asked Questions
What are E12 resistor values?
1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8 and 8.2, repeated in every decade.
Why is 5 kΩ not a standard resistor value?
Values follow a logarithmic series. In E24 the nearest are 4.7 kΩ and 5.1 kΩ; in E96 it is 4.99 kΩ.
Which series should I use?
E24 for general 5 % work and E96 for 1 % precision circuits such as dividers and op amp gain resistors.
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