The image above represents the reservoir radius.

To compute for the reservoir radius, one essential parameter is needed and this parameter is **Well Spacing (A).**

The formula for calculating the reservoir radius:

r_{e} = √[^{43560A } / _{π}]

Where;

r_{e} = Reservoir Radius

A = Well Spacing

Let’s solve an example;

Given that the well spacing of an reservoir radius is 42. Find the reservoir radius?

This implies that;

A = Well Spacing = 42

r_{e} = √[^{43560A } / _{π}]

r_{e} = √[^{43560 x 42 }/ _{π}]

r_{e} = √[^{1829520 }/ _{π}]

r_{e} = √582354.3

r_{e} = 763.12

Therefore, the **reservoir radius **is **763.12 ft.**

**Calculating the well spacing (A) when the Reservoir Radius is Given.**

A = ^{π x re2} / _{43560}

Where;

A = Well Spacing

r_{e} = Reservoir Radius

Let’s solve an example;

Find the well spacing when the reservoir radius is 60.

This implies that;

r_{e} = Reservoir Radius = 60

A = ^{π x re2} / _{43560}

A = ^{π x 602} / _{43560}

A = ^{π x 3600} / _{43560}

A = ^{11309.73} / _{43560}

A = 0.259

Therefore, the **well spacing **is **0.259.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the reservoir radius.

To get the answer and workings of the reservoir radius 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 **Petroleum **under **Engineering**

Now, Click on **Reservoir Fluid Flow **under **Petroleum**

Now, Click on **Reservoir Radius**** **under **Reservoir Fluid Flow**

The screenshot below displays the page or activity to enter your value, to get the answer for the reservoir radius according to the respective parameter which are the **well spacing (A).**

Now, enter the value appropriately and accordingly for the parameter as required by the **well spacing (A) **is **42.**

Finally, Click on Calculate

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