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# Quantity Reference

## Length

Profile Members: Length = length of the Profile Member path
Groups / Components: Length = maximum dimension of the Object's bounding box

## Surface Area

All Objects: Surface Area = Sum of all areas of the faces inside the Object

## Area

2D Profile Members: Area = Volume / (least of Length, Profile Width, Profile Height)
1D Profile Members: Area = Length * (greatest of Profile Width, Profile Height)

## Volume

When it is important to know the volume and weight of a particular object, make sure that the Object is modeled as Profile Member or as a solid object. In a solid object, each edge bounds exactly two faces.

Profile Members: Volume = Area of the Profile multiplied by the length of the member.
Solid Groups / Components that contain no child Objects: Volume = volume of the solid (same as value calculated by SketchUp)
Solid Groups / Components with child Objects: Volume = volume the mesh (calculated by Profile Builder)
Non-Solid Groups / Components: Volue = estimated volume of the mesh

## Weight

The weight calculation will depend on the unit weight data assigned to the layer that the Object is associated with. The weight will be based on the unit weight multiplied by either the length, area or volume.

## Cost

The cost calculation will depend on the cost data assigned to the layer that the Object is associated with. To view the cost calculation, select a single object in your model with the Quantifier tool activated.

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