The image above represents phase lag.

To compute for phase lag, three essential parameters are needed and these parameters are **Frequency (f), Inductance (L) **and **Resistance (R).**

The formula for calculating the phase lag:

φ = tan^{-1 }(^{2πfL}/_{R})

Where:

φ = Phase Lag

f = Frequency

L = Inductance

R = Resistance

Let’s solve an example;

Find the phase lag when the frequency is 20, the inductance is 32 and the resistance is 18.

This implies that;

f = Frequency = 20

L = Inductance = 32

R = Resistance = 18

φ = tan^{-1 }(^{2πfL}/_{R})

φ = tan^{-1 }(^{2π(20)(32)} / _{18})

φ = tan^{-1 }(^{4021.23} / _{18})

φ = tan^{-1 }(223.40)

φ = 89.74°

Therefore, the **phase lag** is **89.74°**.

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the phase lag.

To get the answer and workings of the phase lag 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 **Electromagnetic Method **under **Geology**

Now, Click on **Phase Lag **under **Electromagnetic Method**

The screenshot below displays the page or activity to enter your values, to get the answer for the phase lag according to the respective parameters which are the **F****requency (f), Inductance (L)** and **Resistance (R).**

Now, enter the values appropriately and accordingly for the parameters as required by the **F****requency (f)** is **20**,** Inductance (L)** is **30 **and **Resistance (R)** is **18**.

Finally, Click on Calculate

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