The image above represents viscosity of newtonian fluids.

To compute for viscosity of newtonian fluids, two essential parameters are needed and these parameters are **Shear** **Stress (ζ)** and **Shear Rate (γ).**

The formula for calculating viscosity of newtonian fluids:

η = ^{ζ} / _{γ}

Where:

η = Viscosity of Newtonian Fluids

ζ = Shear Stress

γ = Shear Rate

Let’s solve an example;

Find the viscosity of newtonian fluids when the shear stress is 15 and the shear rate is 5.

This implies that;

ζ = Shear Stress = 15

γ = Shear Rate = 5

η = ^{ζ} / _{γ}

η = ^{15} / _{5}

η = 3

Therefore, the **viscosity of newtonian fluids **is **3.**

**Calculating for Shear Stress when the Newtonian Fluids and the Shear Rate is Given.**

ζ = η x γ

Where;

ζ = Shear Stress

η = Viscosity of Newtonian Fluids

γ = Shear Rate

Let’s solve an example;

Find the shear stress when the newtonian fluids is 20 and the shear rate is 4.

This implies that;

η = Viscosity of Newtonian Fluids = 20

γ = Shear Rate = 4

ζ = η x γ

ζ = 20 x 4

ζ = 80

Therefore, the **shear stress **is **80.**

**Calculating for Shear Rate when the Newtonian Fluids and the Shear Stress is Given.**

γ = ^{ζ} / _{η}

Where;

γ = Shear Rate

η = Viscosity of Newtonian Fluids

ζ = Shear Stress

Let’s solve an example;

Find the shear rate when the newtonian fluids is 10 and the shear stress is 30.

This implies that;

η = Viscosity of Newtonian Fluids = 10

ζ = Shear Stress = 30

γ = ^{ζ} / _{η}

γ = ^{30} / _{10}

γ = 3

Therefore, the **shear rate **is **3.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the viscosity of newtonian fluids.

To get the answer and workings of the viscosity of newtonian fluids 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

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

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

Now, Click on **Rheology **under **Materials and Metallurgical**

Now, Click on **Viscosity of Newtonian Fluids **under **Rheology**

The screenshot below displays the page or activity to enter your values, to get the answer for the viscosity of newtonian fluids according to the respective parameters which is the **Shear** **Stress (ζ)** and **Shear Rate (γ).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Shear** **Stre****ss (ζ)** is **15 **and **Shear Rate (γ)** is **5**.

Finally, Click on Calculate

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