> ## 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. # Evaluating Mass, Volume and Weight Savings Tools to evaluate different properties of your part are available in the *Modeling*tab.

## Mass and Volume The mass and volume of an implicit body can be evaluated with the **Mass Properties**block. This block can be found under *Modeling → Evaluation.* Typing the desired unit into the density input field with the value overrides the default unit seen on the right of the input field.

By going to the Properties tab in the information panel of the block, you can see the mass and volume information to the right of the property chips. You can drag these chips out of the Properties to use in other parts of the workflow.

## Weight Savings Calculations After extracting the mass properties of the original body and the lightweight body, you can use math blocks to calculate the percentage of the change in mass. The calculation result for each mathematical operation shows up at the top right corner of that block.

For a quick check of the percentage weight change, a toolkit block called **Weight Savings** is available under *Lightweighting → Utilities.*