Reality capture can i calculate export size before exporting/paying?

Hi i exported a model as an fbx from reality capture without reducing the tri count and the file size was about 500mb. i wanted to upload to sketchfab but the free version has a 100mb file size limit. Obviously i need to simplify the mesh/reduce text. size, but is it possible to calculate the export size before i make the payment and export it? sorry still pretty new to this software

Hi MARDI,
this is not possible for FBX format, but you can see the estimated file size for GLB format.