Wire Size Calculator
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Length4FeetBundled, sheathed or conduitNoWire Size Calculator
2
Load Current55AmpsEngine RoomNoRecommended Wire4AWG
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Source Voltage12VoltsTemp Rating105°CWire Capacity160
AMPS
4
Allowable Voltage Drop1%
Version
1.65
5
AWG
Metric mm2
inchmmohm/1000'ohm/kmMAX CurrentResistance
for Lenth
(Ohms)
Voltage Drop
Output Voltage
(Source
less Drop)
Percentage Loss (%)Current Loss (Amps)Watts LossWire Cost per footWire Cost Total Run
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0180.5180.03690.9386.4834200.1620006.485.5254.00%21.60259.2$0.20$5.00
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0160.8230.04651.182421.4250.1000004.008.0033.33%13.33160$0.14$3.50
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0141.3090.05871.4912.513.4350.0625002.509.5020.83%8.33100$0.20$5.00
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0122.0810.0741.881.758.45450.0437501.7510.2514.58%5.8370$0.28$7.00
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0103.3090.09332.3710.985.32600.0245000.9811.028.17%3.2739.2$0.38$9.50
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085.2610.11772.9890.623.34800.0155000.6211.385.17%2.0724.8$0.78$19.50
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068.3660.14843.770.42.11200.0100000.4011.603.33%1.3316$1.15$28.75
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1413.3020.18714.7530.241.321600.0060000.2411.762.00%0.809.6$1.67$41.75
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1321.1510.2365.9940.1970.8311800.0049250.2011.801.64%0.667.88NA#VALUE!
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1233.6310.29767.5580.1570.5232100.0039250.1611.841.31%0.526.28$2.69$67.25
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1142.4080.33418.4870.1270.4152450.0031750.1311.871.06%0.425.08$3.44$86.00
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11/053.4750.37529.530.0990.3292850.0024750.1011.900.83%0.333.96$4.48$112.00
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12/067.4310.421310.7020.0770.2613300.0019250.0811.920.64%0.263.08$5.31$132.75
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13/085.0290.473212.0180.0620.2073850.0015500.0611.940.52%0.212.48$7.21$180.25
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14/0107.2190.531313.4950.0490.1644450.0012250.0511.950.41%0.161.96$8.70$217.50
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0The 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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