# Quantity Measure 1. Select the part(s) you want to take some measurements from 2. Under the *Analyse* icon, click the *Measure* button 3. Choose a calculator 4. (optional) change settings or parameters within the calculator 5. Click Calculate The result will be displayed, and the measured quantity will be indicated as a blue overlay over the selected parts, to provide visual feedback. Currently the following calculators are supported: Count, Area, Surface Area, Volume & Length. Let's take a closer look at the different calculators using the following wall as an example. The wall contains two large openings and three smaller openings.
## Count The Count calculator will return the count of products you have selected. In this case we have one wall selected, so the resulting count is 1.
## Area The Area calculators work best for planar objects such as walls, slabs and roofs. The main faces (i.e. the two faces that are larger relative to the other faces) will be automatically detected and the area in the middle between these two faces will be calculated. The **Net Area** calculator will return the area of the selected product(s), taking into account all openings and features. In our example all 5 openings are subtracted from the total area, resulting in an area of 20.32 m².
The **Gross Area** calculator will return the area of the selected product(s), ignoring all openings and features. In our example all 5 openings are ignored, resulting in an area of 25.53 m².
The **Custom Area** calculator will return the area of the selected product(s), ignoring all openings smaller than a specified area. In our example the three openings smaller than 0.5 m² are ignored, resulting in an area of 20.35 m².
## Surface Area The **Surface Area** calculator allows to distinguish between the main faces, feature faces and other faces. For planar objects such as walls, slabs and roofs, the main faces are the two faces that are relatively larger than the other faces. For linear objects such as beams, columns, pipes or ducts, the main faces are faces except for the end faces and feature faces. Feature faces are faces pertaining to openings, recesses and other irregularities in the selected part. In the example below, only the surface area for the two main faces is calculated, taking into account all openings leading to a surface area of 40.64 m².
When selecting only feature faces, we can clearly see the different features highlighted. In this case these features have a combined surface area of 2.58 m².
Finally, the other faces in this case are the top, bottom and end faces of the wall, with a total surface area of 4.13 m².
In this calculator it is also possible to ignore voids smaller than a specified area. The main faces of this wall would be defined as follows:
When ignoring small voids, the feature faces of this wall are defined as follows:
## Volume The **Net Volume** calculator will return the volume of the selected product(s), taking into account all openings and features. In our example all 5 openings are subtracted from the total volume, resulting in a volume of 3.96 m³.
The **Gross Volume** calculator will return the volume of the selected product(s), ignoring all openings and features. In our example all 5 openings are ignored, resulting in a volume of 4.98 m³.
The **Custom Volume** calculator will return the volume of the selected product(s), ignoring all openings smaller than a specified area. In our example the three openings smaller than 0.5 m² are ignored, resulting in a volume of 3.97 m³.
## Length The **Length** calculator will return the length of the selected products; this calculator works best for products that are larger in one dimension relative to the other dimensions, such as beams, columns, pipes and ducts. In our example the Length calculator returns the length of the wall of 7977 mm. A blue line indicates how this measurement was taken.
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