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DC Wire Size Calculator

Input the required values into the calculator to determine the optimal wire size, gauge number, and wire cross-sectional area.

Calculate Wire Size

Calculate Wire Diameter

Calculate Wire Gauge

Calculate Wire Size:

Source voltage:

V ▾

Allowable voltage drop (V):

Conductor material:

Current (I):

A ▾

Wire Length:

m ▾

Wire temperature:

°C ▾

Wire Gauge:

Related

DC Wire Size Calculator

The DC Wire Size Calculator estimates the required wire size for your circuit upon the given current and voltage rating. Solve all of your wire size calculation-related problems with this tool. Use it to get a precise estimation for budgeting your electrical project.

DC Wire Size:

The type of wire that is specifically designed to be used with the direct current or in DC circuits is known as the DC Wire. The direct current flows in one direction. A DC wire is mainly used in various electronic devices, automotive systems, and in the installation of solar panels. These wires are available in various types and sizes. It is necessary to choose the right type and size to have optimal performance. Below we have mentioned a few key factors that you must consider while purchasing the DC wire:

Wire Gauge (AWG): It's the short form of American Wire Gauge that defines the size of the wire. Meanwhile, a smaller AWG means a large diameter wire.
Voltage Rating: Choose the right voltage rating to ensure the safety
Temperature Rating: The maximum temperature limit that the wire can bear
Resistance: Consider the resistance of the wire

DC Wire Size Formula:

\( A(m^2) = \dfrac{2 \times \rho (\Omega \cdot m) \times L(m) \times I(A)}{V_v} \)

Where:

A is the representative of the area
Ρ is the resistance of the conductor in ohms meters(Ω·m)
L shows the length in meters
I is the current in amperes
V is the allowable voltage drop for the wire

How To Calculate DC Wire Size:

Follow the below-outlined steps to calculate the wire size:

First of all, determine the value of the current
Measure the length of the wire by considering the path that the wire will cover from the source to the appliance
Determine the material of the conductor for the wire
Write down the value of the allowable voltage drop
Determine the temperature of the wire
Put these values in the DC wire size formula as we have done below

Example:

Let's suppose you have the following values:

Conductor (ρ) = copper (1.883616) Ω⋅m
Wire length(L) = 100 m
Current (I) = 300 amp
Source voltage (V) = 12 V
Voltage drop (v) = 3 %

Find the 300 amp wire size for a DC/AC single-phase.

Solution:

DC wire size formula is given as follow:

\( A(m^2)= \frac{I(A) \times \rho(\Omega \cdot m) \times L(m)}{V_V} \)

Put the values into the formula:

\( A(m^2)= \frac{300 \times 1.88 \times 10^{-8} \times (2 \times 100)}{0.03 \times 12} \)

\( A(m^2) = \frac{0.00011301696}{0.36} \)

\( A(m^2) = 0.00313936mm \times 1000000 \)

\( A(m^2) = 3139.36mm^2\)

Wire Size Chart:

AWG #	Diameter(inch)	Diameter(mm)	Area (kcmil)	Area(mm2)
0000 (4/0)	0.4600	11.6840	211.6000	107.2193
0000 (3/0)	0.4096	10.4049	167.8064	85.0288
0000 (4/0)	0.4600	11.6840	211.6000	107.2193
00 (2/0)	0.3648	9.2658	133.0765	67.4309
0 (1/0)	0.3249	8.2515	105.5345	53.4751
1	0.2893	7.3481	83.6927	42.4077
2	0.2576	6.5437	66.3713	33.6308
3	0.2294	5.8273	52.6348	26.6705
4	0.2043	5.1894	41.7413	21.1506
5	0.1819	4.6213	33.1024	16.7732
6	0.1620	4.1154	26.2514	13.3018
7	0.1443	3.6649	20.8183	10.5488
8	0.1285	3.2636	16.5097	8.3656
9	0.1144	2.9064	13.0927	6.6342
10	0.1019	2.5882	10.3830	5.2612