> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to calculate the surface area of a cross-section

## Objective:

Calculate the surface area of a cross-section.

## Procedure:

**1. Section the Implicit Body**

First, create the cross-section of your part.

* Add a **Section Body** block.
  * In the Body input, insert the geometry you want to measure.
  * In the Plane input, define the sectioning plane. A **Plane from Normal** block is a common way to do this. You can use a list of Point inputs to create multiple planes.

**2. Calculate the Surface Area**

Next, measure the area of the cross-section you just created.

* Add a **Surface Area** block.
  * Insert the **Section Body** block from the previous step into the Body input.

The calculated area is now available in the block's output.

* You can see the calculated surface area value in the header of the **Surface Area** block's information panel.
* If you select a list of planes, open the block's **Properties** panel to view a list of all the calculated surface area values.

.

![An image showing the properties panel of the Surface Area block. The block has been list processed using the list of Section Body profiles. The result is a list of surface areas for each of the section body profiles.](https://files.learn.ntop.com/help-articles/implicit-modeling/43679796605971.png)

And that's it! You've successfully calculated the surface area of a cross-section in three simple steps.

Are you still having issues? Reach out to the [support team](https://support.ntopology.com/hc/en-us/requests/new), and we'll be happy to help!

## Download the Example file:

* [Example File](https://files.learn.ntop.com/Support%20Article%20Example%20Files/Knowledge%20Base/Implicit%20Modeling/surface_area_cross_section.ntop)

## Keywords:

*surface block slice tpms section body calculate math area cross thin*