VALICALC · TECHNICAL REFERENCE

AWG Wire Size Chart

Look up AWG diameter and area, compare nearby metric conductor sizes and send a selected gauge to the voltage-drop calculator with clear limits.

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Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.

SELECTED REFERENCE

4 AWG

Bare solid diameter
5.189 mm
Geometric area
21.151 mm²
Next listed metric area
25 mm²
All fields & cell provenance
Gauge index
4
AWG designation
4
  • Gauge: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06 · source value 4 AWG.
  • Bare solid diameter: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06.
  • Geometric area: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06.
  • Next listed metric area: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06 · source value 25.
  • Gauge index: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06 · source value 4.
  • AWG designation: Copper wire tables — Generated AWG equation; metric candidates reuse the existing calculator series · verified 2026-10-06 · source value 4.

v1.2.0 · verified 2026-10-06

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4 AWG5.189 mmBack to answer ↑

Explore the verified data

44 matching rows · 44 in this subset

AWG Wire Size Chart, metric display
GaugeBare solid diameterGeometric areaNext listed metric areaActions
40 AWG0.08 mm0.005 mm²0.5 mm²
39 AWG0.09 mm0.006 mm²0.5 mm²
38 AWG0.101 mm0.008 mm²0.5 mm²
37 AWG0.113 mm0.01 mm²0.5 mm²
36 AWG0.127 mm0.013 mm²0.5 mm²
35 AWG0.143 mm0.016 mm²0.5 mm²
34 AWG0.16 mm0.02 mm²0.5 mm²
33 AWG0.18 mm0.025 mm²0.5 mm²
32 AWG0.202 mm0.032 mm²0.5 mm²
31 AWG0.227 mm0.04 mm²0.5 mm²
30 AWG0.255 mm0.051 mm²0.5 mm²
29 AWG0.286 mm0.064 mm²0.5 mm²
28 AWG0.321 mm0.081 mm²0.5 mm²
27 AWG0.361 mm0.102 mm²0.5 mm²
26 AWG0.405 mm0.129 mm²0.5 mm²
25 AWG0.455 mm0.162 mm²0.5 mm²
24 AWG0.511 mm0.205 mm²0.5 mm²
23 AWG0.573 mm0.258 mm²0.5 mm²
22 AWG0.644 mm0.326 mm²0.5 mm²
21 AWG0.723 mm0.41 mm²0.5 mm²

40 AWG

Bare solid diameter
0.08 mm
Geometric area
0.005 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
40
AWG designation
40

39 AWG

Bare solid diameter
0.09 mm
Geometric area
0.006 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
39
AWG designation
39

38 AWG

Bare solid diameter
0.101 mm
Geometric area
0.008 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
38
AWG designation
38

37 AWG

Bare solid diameter
0.113 mm
Geometric area
0.01 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
37
AWG designation
37

36 AWG

Bare solid diameter
0.127 mm
Geometric area
0.013 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
36
AWG designation
36

35 AWG

Bare solid diameter
0.143 mm
Geometric area
0.016 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
35
AWG designation
35

34 AWG

Bare solid diameter
0.16 mm
Geometric area
0.02 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
34
AWG designation
34

33 AWG

Bare solid diameter
0.18 mm
Geometric area
0.025 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
33
AWG designation
33

32 AWG

Bare solid diameter
0.202 mm
Geometric area
0.032 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
32
AWG designation
32

31 AWG

Bare solid diameter
0.227 mm
Geometric area
0.04 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
31
AWG designation
31

30 AWG

Bare solid diameter
0.255 mm
Geometric area
0.051 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
30
AWG designation
30

29 AWG

Bare solid diameter
0.286 mm
Geometric area
0.064 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
29
AWG designation
29

28 AWG

Bare solid diameter
0.321 mm
Geometric area
0.081 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
28
AWG designation
28

27 AWG

Bare solid diameter
0.361 mm
Geometric area
0.102 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
27
AWG designation
27

26 AWG

Bare solid diameter
0.405 mm
Geometric area
0.129 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
26
AWG designation
26

25 AWG

Bare solid diameter
0.455 mm
Geometric area
0.162 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
25
AWG designation
25

24 AWG

Bare solid diameter
0.511 mm
Geometric area
0.205 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
24
AWG designation
24

23 AWG

Bare solid diameter
0.573 mm
Geometric area
0.258 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
23
AWG designation
23

22 AWG

Bare solid diameter
0.644 mm
Geometric area
0.326 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
22
AWG designation
22

21 AWG

Bare solid diameter
0.723 mm
Geometric area
0.41 mm²
Next listed metric area
0.5 mm²
More dimensions
Gauge index
21
AWG designation
21

How to use this data

d = 0.127 × 92^((36−gauge)/39) mm; A = πd²/4. Gauge indices −3, −2, −1 and 0 mean 4/0, 3/0, 2/0 and 1/0. The next listed metric area is a comparison candidate, not an exact interchangeable size.

    CHECK THE METHOD

    Worked example

    4 AWG gives about 5.189 mm bare-solid diameter and 21.15 mm² geometric area. The next listed metric candidate is 25 mm².

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    ReferenceMetric Cable Size ChartReferenceWire Resistance Chart

    Common lookup questions

    Can I use these values as a universal specification?

    Geometry and bulk resistance do not establish ampacity, installation method, insulation rating, derating or electrical-code compliance. Diameter is the equivalent bare solid conductor, not finished cable OD.

    TRACEABLE DATA

    Sources, scope & verification

    Dataset v1.2.0
    Last verified:

    44 authored AWG examples, 4/0 through 40. Metric candidates are the existing calculator series, not guaranteed equivalent products.

    Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

    Copper wire tables ↗

    Type A · US Bureau of Standards · Circular 31, 2nd edition, 1914

    Original generated scenarios from the stated equations; source tables/text/drawings are not reproduced.

    Full provenance & artifact record
    Source checked
    2026-10-06
    Use basis
    authored-formula
    Artifact SHA-256
    No retained source artifact hash; see the stated source and verification record.