Google SketchUp 8 (released in 2010) is a legacy version of the popular 3D modeling software
: You can run the application on any computer (such as a library or office workstation) without needing administrative privileges to install software. Cross-Machine Consistency
System Requirements for Google Sketchup 8 Portable
This article will explore everything you need to know: features, system requirements, legitimate safety warnings, and a step-by-step guide to acquiring and using SketchUp 8 in portable mode.
PortableApps.com
If the manual method is too technical, only download from (though they don't officially host SketchUp 8 due to licensing). Some third-party "PortableAppZ" blogs are credible, but always scan files. Look for a single .paf.exe file.
Volume Calculation:
Solid objects could automatically display their volume in the Entity Info panel. Google SketchUp 8 Released - Architect Magazine
Blender (Portable Apps version)
If you absolutely need offline, portable 3D modeling, consider or Wings 3D – both are modern, free, and safe.