You don’t really want to go down the numbers road, unless you are trying purposely to collapse a wormhole.
You can get the mass limits from (I have this info copied into my in-game notepad):
or
Then look at every ‘info’ on your ship; hull, modules, and rigs; for anything that affects mass. Prop-mods like MWD and afterburner are often mentioned, as are armor plates, because they have a very large effect, but there are many others with small mass that can tip-the-scale.
I could be wrong, but I think the only skill to affect mass is Armor Layering. Others can feel free to correct me.
Heavy Interdictors are a special-case because of their warp disruptor field generator, and I can rarely keep track of the buf / nerf state of them. Again, look at all the info!
Now can you see why I opted for simple answer! I didn’t even get to the spreadsheet yet!