# Mass Calc Panel

Use the Mass Calc panel to obtain the mass, area, and/or volume of a selected group of elements, solids, or surfaces.

Location: Tool page

Because materials can only be assigned to mesh, you cannot find the mass of a geometric entity (surface or solid) - only its area, or surface area and volume.

## Elements Subpanel

Mass from 1D elements other than that of true mass elements (config. 1) is omitted from this calculation.

Mass from 2D or 3D elements is calculated by multiplying each element's volume by the density rho specified for its component. The volume of a two-dimensional element is its surface area multiplied by the thickness specified for its component. The surface area of a two-dimensional element and the volume of a three-dimensional element are calculated using Gaussian quadrature with the patterns of Gauss points that are described with the Jacobian ratio element quality check on the Check Elements panel.
Option Action
elems/comps Select the entities to include in the calculation.
Note: Whether you select elements or components, elements are selected. Components select all elements within the specified components.
area =, volume =, total mass = Display the relevant totaled data for the selected elements once you click calculate.
Note: This is a read-only text field.

## Surfaces Subpanel

Because materials can only be assigned to elements, it is not possible to calculate the mass of an area within HyperWorks because the density cannot be assigned to it. If you wish to find the mass of a 2D shell based on assigned material properties, you would need to mesh the surface, assign a material to the resulting mesh, and then perform a mass calculation on the elements instead of the surfaces.
Option Action
surfs Select the surfaces to include in the calculation.
area = Display the total area of the selected surfaces once you click calculate.
Note: This is a read-only text field.

## Solids Subpanel

Because materials can only be assigned to elements, it is not possible to calculate the mass of a solid within HyperWorks because the density cannot be assigned to it. If you wish to find the mass of a 3D object based on assigned material properties, you would need to tetramesh or hex-mesh the solid, assign a material to the resulting mesh, and then perform a mass calculation on the elements instead of the solids.
Option Action
solids Select the solid entities to included in the calculation.
area =, volume = Display the relevant totaled data for the selected solid elements once you click calculate.
Note: This is a read-only text field.

## Command Buttons

Button Action
calculate Perform the relevant calculations and populate the output fields for area, volume, and/or total mass as appropriate to the entity type once entities have been selected.
return Exit the panel