Wire Cross Sectional Area Calculator [ Wire Size Calculator 2025]

To calculate the total cross-sectional area (A) of a wire, first divide the diameter (d) of a single wire by 2 to get the radius. Then square the radius and multiply by π (pi) to get the cross-sectional area of one wire. Finally, multiply this value by the number of wires (N) to get the total cross-sectional area.

The Wire Cross Sectional Area Calculator lets you to figure out the cross-sectional area of a wire based on its diameter or gauge. This is essential for selecting the right wire size for electrical applications to ensure safety and efficiency.

Formula:

The Wire Cross-Sectional Area Calculator uses a special formula:

$\mathrm{ \; A}=\frac{\mathrm{<span\; class="katex-html"\; aria-hidden="true"><span\; class="base"><span\; class="mord"><span\; class="mfrac"><span\; class="vlist-t\; vlist-t2"><span\; class="vlist-r"><span\; class="vlist"><span\; class="sizing\; reset-size6\; size3\; mtight"><span\; class="mord\; mtight"><span\; class="mord\; mathnormal\; mtight">\pi </span></span></span></span></span></span></span></span></span></span>}\times d^2}{4\times n}$

Where:

• $A$ is the total cross-sectional area (in square millimeters).
• $\pi$ is the constant (approximately 3.1416).
• $d$ is the diameter of one strand (in millimeters).
• $N$ is the number of strands.

Solved Calculations :

Example 1:

Given:

• Diameter (d) = 4 mm
• Number of wires (N) = 10

Calculation	Instructions
Step 1: A = $\pi \times \left( \frac{d}{2} \right)^2 \times N$	Start with the formula.
Step 2: A = $3.14159 \times \left( \frac{4}{2} \right)^2 \times 10$	Replace $d$ with 4 mm and $N$ with 10.
Step 3: A = $3.14159 \times (2)^2 \times 10$	Divide the diameter by 2 to get the radius.
Step 4: A = $3.14159 \times 4 \times 10$	Square the radius.
Step 5: A = $125.664 \text{ mm}^2$	Multiply the result by $\pi$ and by 10 (number of wires).

Answer:
The total cross-sectional area is 125.66 mm².

Example 2:

Given:

• Diameter (d) = 6 mm
• Number of wires (N) = 5

Calculation	Instructions
Step 1: A = $\pi \times \left( \frac{d}{2} \right)^2 \times N$	Start with the formula.
Step 2: A = $3.14159 \times \left( \frac{6}{2} \right)^2 \times 5$	Replace $d$ with 6 mm and $N$ with 5.
Step 3: A = $3.14159 \times (3)^2 \times 5$	Divide the diameter by 2 to get the radius.
Step 4: A = $3.14159 \times 9 \times 5$	Square the radius.
Step 5: A = $141.372 \text{ mm}^2$	Multiply the result by $\pi$ and by 5 (number of wires).

Answer:
The total cross-sectional area is 141.37 mm².

Wire Cross Sectional Area Calculator [Electric Wire, Cable Cross, Wire Diameter, Wire Gauge, Wire Size Calculator]

The Wire Cross Sectional Area Calculator can be used for figuring out the cross-sectional area of a wire based on its diameter or gauge. The cross-sectional area plays a vital role in understanding the current-carrying capacity and resistance of the wire. 

This formula is crucial when sizing wires for electrical applications, as it allows users to select the correct gauge based on their system’s current and voltage requirements.

Wire cross-sectional area is particularly important in electrical engineering because it determines how much current the wire can safely carry without overheating. The calculator also allows users to find the cross-sectional area for common wire gauges, such as 12 AWG, 14 AWG, and 18 AWG. 

 Moreover, it can convert between mm² and other units, providing flexibility in applications such as electrical installations, automotive wiring, and construction. 

Final Words:

Overall, this calculator is important in electrical and engineering applications to ensure the wire can handle the required current without overheating.