AWG Wire Gauge Calculator & Size Chart – Accurate Wire Specs & Current Ratings

AWG “American Wire Gauge” Size Calculator & Cable Properties Table & Chart

American Wire Gauge “AWG” Calculator

The following American Wire Gauge (AWG) calculator will calculate the diameter in mm, inches, cross sectional area in mm², inches² and kcmil or MCM, resistance per 1000 feet and per 1000 meters and the current rating in amperes for chassis wiring and power transmission applications. To calculate the values, just select or enter the AWG size and hit the “Calculate” button to get the result of different properties of AWG cables and wires.

• Related Calculator : Standard Wire Gauge “SWG” Calculator – SWG Size Chart & Table

Good to know: AWG or American Wire Gauge is also known as “Brown and Sharpe Wire Gauge” used in North America for wire sizing.

*The data for resistance of copper and other wires in Ω/km and Ω/kft are at 20°C or 68°F.

Related Calculators:

• Electrical Wire & Cable Size Calculator (Copper & Aluminum)
• Wire & Cable Size Calculator in AWG

Wire Diameter in mm & Inch Calculation

Wire Diameter in mm “millimeters”.

d_n = 27 x 10^-3 x 92^(36-n)÷39

d_n = 0.127 x 92^(36-n)÷39     …     In millimeters (mm).

Where:

• d = The wire diameter in millimeter “mm”.
• n = Number of the gauge size. 

Wire Diameter in Inches “in”.

d_n = 5 x 10^-3 x 92^(36-n)÷39

d_n = 0.005 x 92^(36-n)÷39     …     In inches

Where:

• d = The wire diameter in inches “in”.
• n = Number of the gauge size. 

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Wire Cross Sectional Area in mm², inch² & kcmil Calculations

Wire Cross Sectional Area in Square Millimeter “mm²“.

A_n = (π ÷ 4) x d_n²

A_n = 12.668 x 10^-3 x 92^(36-n)÷19.5

Where:

• A_n = Cross sectional area of “n” gauge wire size in square millimeters “mm²“.
• n = The number “#” of gauge size.
• d = Wire square diameter in “mm²“.

Wire Cross Sectional Area in Square Inches “in²“.

A_n = (π ÷ 4) x d_n²

A_n = 19635 x 10^-6 x 92^(36-n)÷19.5

Where:

• An = Cross sectional area of “n” gauge wire size in square inches “in²“.
• n = The number “#” of gauge size.
• d = Wire square diameter in “in²“.

Wire Cross Sectional Area in kcmil “kilo circular mils”.

A_n = 1000 x d_n² = 0.025 x 92^(36-n)÷19.5

Where:

• An = cross sectional area of “n” gauge wire size in kcmil.
• kcmil = kilo circular mils.
• n = the number of gauge size.
• d = wire square diameter in in².

Note: kcmil is also known as MCM “thousands of circular mils” i.e. 1kcmil = 1MCM = 0.5067 mm².

2 MCM ≈ 1 mm²

1000 mils = 1 inch

In addition, MCM and kcmil is used for large diameter wires in AWG.

Related Calculators:

• kVAR to Farad Calculator – How to Convert kVAR to μ-Farads?
• μ-Farad to kVAR Calculator – How to Convert Farads to kVAR?

Wire Resistance Calculations Formula

Resistance per 1000 feet at 20°C or 68°F:

R_n = 0.3048 x 10⁹ × ρ ÷ (25.4²x A_n)

Where;

• R = Resistance of the wire conductors in “Ω/kft”.
• n = # of gauge size.
• ρ = rho = resistivity in (Ω·m).
• An = the cross sectional area of n #gauge in square inches “in²“.

Resistance per 1000 Meters at 20°C or 68°F:

R_n = 10⁹ x ρ ÷ A_n

Where;

• R = Resistance of the wire conductors “in Ω/km”.
• n = # of gauge size.
• ρ = rho = resistivity in (Ω·m).
• An = the cross sectional area of n #gauge in square millimeters “mm²“.

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American Wire Gauge “AWG” Size Chart & Table

The following AWG “American Wire Gauge” table shows the AWG Size and diameter in millimeter “mm” and inches in “in”, its cross section area in mm², Inche² and kcmil or MCM and resistance in ohms per 1000 feet and 1000 meter. The AWG size chart also shows the current in amperes for chassis wiring and power transfer application.

AWG #	Diameter		Cross Section Area			Resistance in Ω		Current in Amps
	mm	inch	mm2	Inch2	kcmil	Ω / kft	Ω / km	Chassis Wiring	Power Transfer
0000 (4/0)	11.6840	0.4600	107.2193	0.1662	211.6000	0.049	0.1608	380	302
000 (3/0)	10.4049	0.4096	85.0288	0.1318	167.8064	0.0618	0.2028	328	239
00 (2/0)	9.2658	0.3648	67.4309	0.1045	133.0765	0.0779	0.2557	283	190
0 (1/0)	8.2515	0.3249	53.4751	0.0829	105.5345	0.0983	0.3224	245	150
1	7.3481	0.2893	42.4077	0.0657	83.6927	0.1239	0.4066	211	119
2	6.5437	0.2576	33.6308	0.0521	66.3713	0.1563	0.5127	181	94
3	5.8273	0.2294	26.6705	0.0413	52.6348	0.197	0.6464	158	75
4	5.1894	0.2043	21.1506	0.0328	41.7413	0.2485	0.8152	135	60
5	4.6213	0.1819	16.7732	0.0260	33.1024	0.3133	1.028	118	47
6	4.1154	0.1620	13.3018	0.0206	26.2514	0.3951	1.296	101	37
7	3.6649	0.1443	10.5488	0.0164	20.8183	0.4982	1.634	89	30
8	3.2636	0.1285	8.3656	0.0130	16.5097	0.6282	2.061	73	24
9	2.9064	0.1144	6.6342	0.0103	13.0927	0.7921	2.599	64	19
10	2.5882	0.1019	5.2612	0.0082	10.3830	0.9988	3.277	55	15
11	2.3048	0.0907	4.1723	0.0065	8.2341	1.26	4.132	47	12
12	2.0525	0.0808	3.3088	0.0051	6.5299	1.588	5.211	41	9.3
13	1.8278	0.0720	2.6240	0.0041	5.1785	2.003	6.571	35	7.4
14	1.6277	0.0641	2.0809	0.0032	4.1067	2.525	8.285	32	5.9
15	1.4495	0.0571	1.6502	0.0026	3.2568	3.184	10.448	28	4.7
16	1.2908	0.0508	1.3087	0.0020	2.5827	4.015	13.174	22	3.7
17	1.1495	0.0453	1.0378	0.0016	2.0482	5.063	16.612	19	2.9
18	1.0237	0.0403	0.8230	0.0013	1.6243	6.385	20.948	16	2.3
19	0.9116	0.0359	0.6527	0.0010	1.2881	8.051	26.415	14	1.8
20	0.8118	0.0320	0.5176	0.0008	1.0215	10.152	33.308	11	1.5
21	0.7229	0.0285	0.4105	0.0006	0.8101	12.802	42.001	9	1.2
22	0.6438	0.0253	0.3255	0.0005	0.6424	16.143	52.962	7	0.92
23	0.5733	0.0226	0.2582	0.0004	0.5095	20.356	66.784	4.7	0.729
24	0.5106	0.0201	0.2047	0.0003	0.4040	25.668	84.213	3.5	0.577
25	0.4547	0.0179	0.1624	0.0003	0.3204	32.367	106.19	2.7	0.457
26	0.4049	0.0159	0.1288	0.00025	0.2541	40.814	133.9	2.2	0.361
27	0.3606	0.0142	0.1021	0.00020	0.2015	51.466	168.85	1.7	0.288
28	0.3211	0.0126	0.0810	0.00013	0.1598	64.897	212.92	1.4	0.226
29	0.2859	0.0113	0.0642	0.00010	0.1267	81.833	268.48	1.2	0.182
30	0.2546	0.0100	0.0509	0.00008	0.1005	103.19	338.55	0.86	0.142
31	0.2268	0.0089	0.0404	0.00006	0.0797	130.12	426.9	0.7	0.113
32	0.2019	0.0080	0.0320	0.00005	0.0632	164.08	538.32	0.53	0.091
33	0.1798	0.0071	0.0254	0.00004	0.0501	206.9	678.8	0.51	0.088
34	0.1601	0.0063	0.0201	0.000031	0.0398	260.9	855.96	0.43	0.072
35	0.1426	0.0056	0.0160	0.000025	0.0315	328.98	1,079.3	0.43	0.072
36	0.1270	0.0050	0.0127	0.000020	0.0250	414.84	1,361	0.33	0.056
37	0.1131	0.0045	0.0100	0.000016	0.0198	523.1	1,716.2	0.33	0.056
38	0.1007	0.0040	0.0080	0.000012	0.0157	659.62	2,164.1	0.27	0.044
39	0.0897	0.0035	0.0063	0.000010	0.0125	831.77	2,728.9	0.26	0.043
40	0.0799	0.0031	0.0050	0.000008	0.0099	1,048.8	3,441.1	0.21	0.035

Note: Resistance of wires in Ω/km and Ω/kft are at 20°C or 68°F.

Here is the AWG wire size chart in image format if you need to download it for later use.

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