# What is the surface area of a rectangular prism?

A rectangular prism is a **3D **plane figure having **6 sides** making an** angle of 90 degrees** with each other. The simplest figure similar to a rectangular prism is a shoebox or a brick. As it is a plane surface, it also covers a specific region when placed on something like a** **table**.**

The** **region that is surrounded by all sides of a rectangular prism is called the** **surface area** **of a rectangular prism. In this measurement, all three lengths i.e. **width, length, and height,** are involved. As the opposite faces of a rectangular prism are of the same** **measures, that’s why these sides are involved in the **surface area calculation for once.**

If you don’t know about this** **measurement and want to learn from scratch, you should read this blog. On this page, we will share a **comprehensive** guide on how to calculate the surface area of a rectangular prism.

## How to find the area of a rectangular prism?

Finding the** surface area of a rectangular prism** is not complicated when you know the measurements for its three sides. If you know the measurements for length, width, and height**,** you can follow this** formula** to calculate this measurement.

**Surface Area of a Rectangular Prism** **= 2 [(length x width) + (width x height) + (length x height)]**

To understand this** calculation process** with ease, here are some steps that you can follow.

- Write all
**measurements given**for a rectangular prism

- Check if all of those are in the
**same units**or not

- If not, convert all measurements into a
**single unit**

- Now, multiply the
**width by height**, and length by height

- Put the
**above formula**

- Add all
**values**that you got from multiplication

- Multiply the resultant by
**“2”**for the**final answer**

By following these** steps**, you can find the surface area of a rectangular prism. If you want to get a demonstration of these steps and **check the solution **to a problem for understanding, you can use our** Rectangular Prism Calculator**.

This **online maths calculator** will allow you to learn the **step-by-step solution **for the calculation of surface area. It will help you better understand the calculation and allow you to **solve problems** related to it quickly as well. Keep in mind that the** **units of surface area will be the **square of the units** in which measurements are given.

## How to calculate the surface area of a rectangular prism?

To make the** **method for calculation more clear, we have solved an example here. Just have a look at the steps we have taken for the calculation of the** surface area of a rectangular prism.**

**example 1**:

Find the area of a rectangular prism having **dimensions**, **length = 3m, width = 5m, and height = 9m.**

**Solution**:

As all measurements have the **same units**, so, we have to multiply them one by one.

**Length x Width = 15m**

**Width x Height = 45m**

**Length x Height = 27m**

Now, we have to put these **values** in the following formula.

**Surface Area of a Rectangular Prism = 2 [(l x w) + (w x h) + (l x h)]**

**= 2 [15 + 45 + 27] sq. meter**

**Surface Area = 154 m2**

## Conclusion

We hope that you have learned the way to find the **surface area of a rectangular prism** by reading the above steps and looking at the example. If you are still confused or have higher measurements, you can use our online **Rectangular Prism Calculator**.

It will absolutely help** **you in having a better idea of the **solution** to your questions. Also, you can complete your assignments with minimal manual effort using this **online tool.**

**FAQ**

**FAQ**

**What is the surface area of a rectangular prism?**

The region that the plane sides of a rectangular prism cover is called the surface area of this figure.

**What is the surface area formula prism?**

To** calculate **the surface area of a rectangular prism, you can follow this formula.

**Surface Area of a Rectangular Prism = 2 [(l x w) + (w x h) + (l x h)]**

**What are the formulas for the surface area and volume of a rectangular prism?**

The** formula **for the surface area of a rectangular prism is:

**Surface Area of a Rectangular Prism = 2 [(l x w) + (w x h) + (l x h)]**

The **formula** for the volume of a rectangular prism can be derived from the area and is given by,

**Volume of a rectangular prism = B x H**

Here,** “B”** is representing the** **base area while **“H”** is the **height of the prism.**

**How to find the surface area of a rectangular prism?**

To find the surface area of a rectangular prism, you can follow this **formula:**

**SA = 2 [(l x w) + (w x h) + (l x h)]**