The image above represents Poisson’s ratio.

To compute for Poisson’s ratio, two essential parameters are needed and these parameters are **lateral strain (ε _{l}) **and

**axial strain (ε**

_{a}).The formula for calculating Poisson’s ratio:

v = ^{εl} / _{εa}

Where:

v = Poisson’s Ratio

ε_{l} = Lateral Strain

ε_{a} = Axial Strain

Let’s solve an example;

Find the Poisson’s ratio when the lateral strain is 80 and the axial strain is 4.

This implies that;

ε_{l} = Lateral Strain = 80

ε_{a} = Axial Strain = 4

v = ^{εl} / _{εa}

v = ^{80} / _{4}

v = 20

Therefore, the **Poisson’s ratio **is **20.**

**Calculating the Lateral Strain when the Poisson’s Ratio and Axial Strain is Given.**

ε_{l} = v x ε_{a}

Where:

ε_{l} = Lateral Strain

v = Poisson’s Ratio

ε_{a} = Axial Strain

Let’s solve an example;

Find the lateral strain when the Poisson’s ratio is 40 and the axial strain is 9.

This implies that;

v = Poisson’s Ratio = 40

ε_{a} = Axial Strain = 9

ε_{l} = v x ε_{a}

ε_{l} = 40 x 9

ε_{l} = 360

Therefore, the **lateral strain **is **360.**

**Calculating the Axial Strain when the Poisson’s Ratio and Lateral Strain is Given.**

ε_{a} = ^{εl} / _{v}

Where:

ε_{a} = Axial Strain

v = Poisson’s Ratio

ε_{l} = Lateral Strain

Let’s solve an example;

Find the axial strain when the Poisson’s ratio is 20 and the lateral strain is 120.

This implies that;

v = Poisson’s Ratio = 20

ε_{l} = Lateral Strain = 120

ε_{a} = ^{εl} / _{v}

ε_{a} = ^{120} / _{20}

ε_{a} = 60

Therefore, the **axial strain **is **60.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the Poisson’s ratio.

To get the answer and workings of the Poisson’s ratio 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 **for** NGN 1,500 **per** annum** 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 **Geology**** **under **Add-on.**

Now, Click on **Rock Mechanics**** **under **Geology**

Now, Click on **Poisson’s Ratio** under **Rock Mechanics**

The screenshot below displays the page or activity to enter your values, to get the answer for the Poisson’s ratio according to the respective parameters which are the **lateral strain (ε _{l}) **and

**axial strain (ε**

_{a}).Now, enter the values appropriately and accordingly for the parameters as required by the **lateral strain (ε _{l}) **is

**80**and

**axial strain (ε**is

_{a})**4**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the Poisson’s ratio and presents the formula, workings and steps too.