The image below illustrates the cross-sectional area. To calculate cross-sectional area, three essential parameters are needed: resistivity (ρ), Length (l), and** Resistance (R).**

**The formula for calculating cross-sectional area:**

A = ^{pl}/_{R}

Where:

A = Cross-sectional Area

ρ = resistivity

R = Resistance

l = Length

Let’s solve an example;

Find the cross-sectional area when the resistivity is 4, the resistance is 12 and length is 6.

This implies that;

ρ = resistivity = 4

R = Resistance = 12

l = Length = 6

A = ^{pl}/_{R}

So, A = ^{(4)(6)}/_{12}

A = ^{(24)}/_{12}

A = 2

Therefore, the **cross-sectional area **is **2m².**

Read more: How to Calculate and Solve for Electrical Conductivity | Electrical Properties

**Calculating the Length when the Cross-sectional Area, the Resistivity and the Resistance are Given**

l = ^{RA}/_{p}

Where:

l = Length

ρ = resistivity

R = Resistance

A = Cross-sectional Area

Let’s solve an example;

Find the length when the resistivity is 12, the resistance is 6 and the cross-sectional area is 4.

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This implies that;

ρ = resistivity = 12

R = Resistance = 6

A = Cross-sectional Area = 4

l = ^{RA}/_{p}

That is, l = ^{(6)(4)}/_{12}

l = ^{(24)}/_{12}

l = 2

Therefore, the **length **is **2m.**

**How to Calculate Cross-Sectional Area With Nickzom Calculator**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the cross-sectional area.

To get the answer and workings of the cross-sectionalarea using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Materials and Metallurgical **under **Engineering****.**

Then, Click on **Electrical Properities**** **under **Materials and Metallurgical**

Now, Click on **Electrical Resistivity** under **Electrical Properities**

Now, Click on **Cross-sectional Area **under **Electrical Resistivity**

The screenshot below displays the page or activity to enter your values, to get the answer for the cross-sectional area according to the respective parameter which is the **Resistivity (ρ), Length (l)** and** Resistance (R).**

So, enter the values appropriately and accordingly for the parameters as required by the **Resistivity (ρ)** is **4**,** Length (l) **is **6** and** Resistance (R)** is **12**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the cross-sectional area and presents the formula, workings and steps too.