The image above represents the true stress.

To compute for the true stress, two essential parameters are needed and these parameters are **force (F)** and **instantaneous area (A _{i})**.

The formula for calculating true stress:

σ_{T} = ^{F} / _{Ai}

Where;

_{T} = True Stress

F = Force

A_{i} = Instantaneous Area

Let’s solve an example;

Find the true stress when the instantaneous area is 60 with a force of 25.

This implies that;

F = Force = 25

A_{i} = Instantaneous Area = 60

σ_{T} = ^{F} / _{Ai}

σ_{T} = ^{25} / _{60}

σ_{T} = 0.416

Therefore, the **true stress** is **0.416 Pa**.

**Calculating the Force when True Stress and Instantaneous Area is Given.**

F = A_{i} x σ_{T}

Where;

F = Force

σ_{T} = True Stress

A_{i} = Instantaneous Area

Let’s solve an example;

Find the force when the instantaneous area is 30 with a true stress of 15.

This implies that;

σ_{T} = True Stress = 15

A_{i} = Instantaneous Area = 30

F = A_{i} x σ_{T}

F = 30 x 15

F = 450

Therefore, the **force** is **450.**

**Calculating the Instantaneous Area when True Stress and Force is Given.**

A_{i} = ^{F} / _{σT}

Where;

A_{i} = Instantaneous Area

F = Force

σ_{T} = True Stress

Let’s solve an example;

Find the instantaneous area when the force is 440 with a true stress of 22.

This implies that;

σ_{T} = True Stress = 22

F = Force = 440

A_{i} = ^{F} / _{σT}

A_{i} = ^{440} / _{22}

A_{i} = 20

Therefore, the **instantaneous area** is **20**.

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the true stress.

To get the answer and workings of the true stress 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 **Material & Metallurgical **under **Engineering**

Now, Click on **Mechanical Properties **under **Material & Metallurgical**

Click on **True Stress**** **under **Material & Metallurgical**

The screenshot below displays the page or activity to enter your value, to get the answer for the true stress according to the respective parameter which are the **force (F)** and **instantaneous area (A _{i})**.

Now, enter the value appropriately and accordingly for the parameter as required by the **force (F) **is **25**** **and **instantaneous area (A _{i}) **is

**60**.

Finally, Click on Calculate

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