Etabs Mass Summary By Story Better -

If your Mass Summary by Story looks "wrong" compared to your manual hand calculations, check these three areas:

When you use ETABS for high-rise or complex structures, simply looking at the total mass isn't enough. You need to ensure the distribution aligns with the structural intent. Why Mass Summary by Story Matters

Ensure you are checking the "Include Lateral Mass" option for seismic analysis. etabs mass summary by story better

Mass moments of inertia; critical for capturing torsional effects.

If you'd like to dive deeper into the technical side, I can help you with: The for mass source. How to export this data to Excel for faster reporting. If your Mass Summary by Story looks "wrong"

Architects often provide cladding as a line load. Ensure these are applied to the perimeter beams and that the mass source is set to include "Specified Load Patterns."

Ensure you haven't modeled a slab over a slab, which doubles the mass in that specific story. Mass moments of inertia; critical for capturing torsional

Cumulative mass from the top down; used to check total building weight.

Check if superimposed dead loads (SIDL) are applied correctly.