Our skeletons are constructed from lightweight space metal, we have a lot of redundant and enhanced organs, nanites course through our veins. There's no specific weight to suits, but let's make a rough comparison with some stuff.
Our enhanced clones have 10 hp before they're terminated (basically how people can be at 0 hp yet still live), I'd speculate that a normal baseline human has ~2-5 hp, a commando punches for 240 damage - they could kill 48-120 people in one punch if there was no limitation of space/distance.
There's also a factor of 100 difference between eve/dust numbers
so if we take an eve ship or even an item like https://wiki.eveonline.com/en/wiki/400mm_Reinforced_Rolled_Tungsten_Plates_I note that it provides 1050 hp for 275 000kg of mass (these numbers can range quite a bit). Multiply the HP by 100 and you get 10500, divide the mass that by and you get a number of about 2.619 kilo's per point of hp.
Amarr sentinel with no skills has 600 base armor, which would make their suit weigh about 1571 kilo's. Multiply that by 2.2 and you get a number of around 3457LB's of weight, not accounting for weapon or power supply or other stuff. I'm not going to bother factoring for armor plates or other things, but let's just make the assumption that these suits are big and quite heavy even with some abstractions made.
On a second thought, It might be more fair to use 50mm armor plates like
https://wiki.eveonline.com/en/wiki/50mm_Reinforced_Rolled_Tungsten_Plates_I as a point of reference which come out with a number of about .8396 kilo's to point of HP, because armor plate scaling is weird. The 50mm plate variation puts an amarr sentinel at 1100lbs.
Yay space math.
50mm steel plating 1 gives 9400 dust hp for 15000 kg, providing a ratio of 1.595kg/hp or its t2 variant is 15000 dust hp for 15000kg which is a happy 1:1 hp/kg ratio.
It's probably safe to ignore my 400mm reference because that stuff is stupidly thick, and 50mm is just a little bit thinner than conventional 60mm vehicle plating used today. So dropsuits are probably using something along the line of 25mm-30mm plating. Amarr sentinel directly references in its description using 25mm ceramic composites OR steel plating, none of the other dropsuits talk about what they use specifically.