IEC 60063 preferred numbers

E-series standard value tables

Preferred values per decade defined by IEC 60063. Multiply by any power of ten: 4.7 gives 4.7 Ω, 47 Ω, 470 Ω, 4.7 kΩ, 47 kΩ…

E3 — 3 values per decade (over ±20 % (rarely used))

E6 — 6 values per decade (±20 % · common for capacitors)

E12 — 12 values per decade (±10 %)

E24 — 24 values per decade (±5 %)

E48 — 48 values per decade (±2 %)

1.00
1.05
1.10
1.15
1.21
1.27
1.33
1.40
1.47
1.54
1.62
1.69
1.78
1.87
1.96
2.05
2.15
2.26
2.37
2.49
2.61
2.74
2.87
3.01
3.16
3.32
3.48
3.65
3.83
4.02
4.22
4.42
4.64
4.87
5.11
5.36
5.62
5.90
6.19
6.49
6.81
7.15
7.50
7.87
8.25
8.66
9.09
9.53

E96 — 96 values per decade (±1 %)

1.00
1.02
1.05
1.07
1.10
1.13
1.15
1.18
1.21
1.24
1.27
1.30
1.33
1.37
1.40
1.43
1.47
1.50
1.54
1.58
1.62
1.65
1.69
1.74
1.78
1.82
1.87
1.91
1.96
2.00
2.05
2.10
2.15
2.21
2.26
2.32
2.37
2.43
2.49
2.55
2.61
2.67
2.74
2.80
2.87
2.94
3.01
3.09
3.16
3.24
3.32
3.40
3.48
3.57
3.65
3.74
3.83
3.92
4.02
4.12
4.22
4.32
4.42
4.53
4.64
4.75
4.87
4.99
5.11
5.23
5.36
5.49
5.62
5.76
5.90
6.04
6.19
6.34
6.49
6.65
6.81
6.98
7.15
7.32
7.50
7.68
7.87
8.06
8.25
8.45
8.66
8.87
9.09
9.31
9.53
9.76

E192 — 192 values per decade (±0.5 %, ±0.25 %, ±0.1 % and better)

1.00
1.01
1.02
1.04
1.05
1.06
1.07
1.09
1.10
1.11
1.13
1.14
1.15
1.17
1.18
1.20
1.21
1.23
1.24
1.26
1.27
1.29
1.30
1.32
1.33
1.35
1.37
1.38
1.40
1.42
1.43
1.45
1.47
1.49
1.50
1.52
1.54
1.56
1.58
1.60
1.62
1.64
1.65
1.67
1.69
1.72
1.74
1.76
1.78
1.80
1.82
1.84
1.87
1.89
1.91
1.93
1.96
1.98
2.00
2.03
2.05
2.08
2.10
2.13
2.15
2.18
2.21
2.23
2.26
2.29
2.32
2.34
2.37
2.40
2.43
2.46
2.49
2.52
2.55
2.58
2.61
2.64
2.67
2.71
2.74
2.77
2.80
2.84
2.87
2.91
2.94
2.98
3.01
3.05
3.09
3.12
3.16
3.20
3.24
3.28
3.32
3.36
3.40
3.44
3.48
3.52
3.57
3.61
3.65
3.70
3.74
3.79
3.83
3.88
3.92
3.97
4.02
4.07
4.12
4.17
4.22
4.27
4.32
4.37
4.42
4.48
4.53
4.59
4.64
4.70
4.75
4.81
4.87
4.93
4.99
5.05
5.11
5.17
5.23
5.30
5.36
5.42
5.49
5.56
5.62
5.69
5.76
5.83
5.90
5.97
6.04
6.12
6.19
6.26
6.34
6.42
6.49
6.57
6.65
6.73
6.81
6.90
6.98
7.06
7.15
7.23
7.32
7.41
7.50
7.59
7.68
7.77
7.87
7.96
8.06
8.16
8.25
8.35
8.45
8.56
8.66
8.76
8.87
8.98
9.09
9.20
9.31
9.42
9.53
9.65
9.76
9.88

Find the nearest standard value

Frequently asked questions

Why are the values not round numbers?

Each series divides a decade into n steps of equal ratio 10^(1/n). Successive values are spaced so that, with the series tolerance, the ranges of neighbouring values touch or overlap.

Is E192 exactly the formula?

E48, E96 and E192 are the formula rounded to three digits, except one value in E192 (9.20 instead of 9.19). E3 to E24 are historical values that differ slightly from the formula.