Wire Size Calculator

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P
1		Length	(Combined supply & Return)		30	Feet	Bundled, sheathed or conduit			No	Wire Size Calculator
2			Load Current		50	Amps	Engine Room			Yes	Recommended Wire		4	AWG
3			Source Voltage		12	Volts	Temp Rating			90°C	Wire Capacity		111	AMPS
4		Allowable Voltage Drop			3%								Version	1.65
5		AWG	Metric mm2	inch	mm	ohm/1000'	ohm/km	MAX Current	Resistance for Lenth (Ohms)	Voltage Drop	Output Voltage (Source less Drop)	Percentage Loss (%)	Current Loss (Amps)	Watts Loss	Wire Cost per foot	Wire Cost Total Run
6	0	18	0.823	0.0369	0.938	6.48	34	16.4	0.194400	9.72	2.28	81.00%	40.50	486	$0.20	$6.00
7	0	16	1.309	0.0465	1.182	4	21.4	20.5	0.120000	6.00	6.00	50.00%	25.00	300	$0.14	$4.20
8	0	14	2.081	0.0587	1.491	2.5	13.4	24.6	0.075000	3.75	8.25	31.25%	15.63	187.5	$0.20	$6.00
9	0	12	3.309	0.074	1.88	1.75	8.45	32.8	0.052500	2.63	9.38	21.88%	10.94	131.25	$0.28	$8.40
10	0	10	5.261	0.0933	2.371	0.98	5.32	45.1	0.029400	1.47	10.53	12.25%	6.13	73.5	$0.38	$11.40
11	0	8	8.366	0.1177	2.989	0.62	3.34	57.4	0.018600	0.93	11.07	7.75%	3.88	46.5	$0.78	$23.40
12	0	6	13.302	0.1484	3.77	0.4	2.1	82	0.012000	0.60	11.40	5.00%	2.50	30	$1.15	$34.50
13	1	4	21.151	0.1871	4.753	0.24	1.32	110.7	0.007200	0.36	11.64	3.00%	1.50	18	$1.67	$50.10
14	1	3	27.01	0.236	5.994	0.197	0.831	127.1	0.005910	0.30	11.70	2.46%	1.23	14.775	NA	#VALUE!
15	1	2	33.631	0.2976	7.558	0.157	0.523	147.6	0.004710	0.24	11.76	1.96%	0.98	11.775	$2.69	$80.70
16	1	1	42.408	0.3341	8.487	0.127	0.415	172.2	0.003810	0.19	11.81	1.59%	0.79	9.525	$3.44	$103.20
17	1	1/0	53.475	0.3752	9.53	0.099	0.329	200.9	0.002970	0.15	11.85	1.24%	0.62	7.425	$4.48	$134.40
18	1	2/0	67.431	0.4213	10.702	0.077	0.261	233.7	0.002310	0.12	11.88	0.96%	0.48	5.775	$5.31	$159.30
19	1	3/0	85.029	0.4732	12.018	0.062	0.207	270.6	0.001860	0.09	11.91	0.78%	0.39	4.65	$7.21	$216.30
20	1	4/0	107.219	0.5313	13.495	0.049	0.164	315.7	0.001470	0.07	11.93	0.61%	0.31	3.675	$8.70	$261.00
21	0	The Author has developed this calculator as a reference for the inclined DIY. This calculator is heavily influenced by AYBC's E-11 “AC and DC Electrical Systems on Boats. This tool is a work in progress, and may contain errors. Version 1.5 fixes error in recomended wire size with a high voltage drop input Version 1.6 added cost per foot and total cost per run, this is a cost snapshot that is intended to give you an idea in moving up or down in size Version 1.65 fixed title voltage drop column While the author has tried to cross check this calculator with other available tools, it does not account for all the possible variations in choosing of wire size and circuit protection. The Author expressly disclaims responsibility for any use of this calculator that results in inadequate wire size or circuit protection. If in doubt please consult an appropriate professional.
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