Oh seriously, that is total bullshit. Either you're running a rather old version which has rounding errors (I believe there was one such version, but it's a few weeks old already) of it and should press Control + F5 while the calculator is open to force-reload -
like I suggested before - or you're just trolling. Here's how it works on my computer. Body armor is set to 7 so any weight added will start reducing wpf. WPF is set to 100 so basically effective weight of 0.5 (or helmet weight of ~0.17) is requireed for it to go to 99.
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loginRegardless of if it works or not, as the programmer of the wpf-weight calculation part of the calculator I can guarantee you that to my best knowledge equipment weights below 1 do contribute to the total weight and thus whatever faulty version of calculator you have cached can't be held as an evidence of the contrary since any faults are just evidence of my lack of programming skills, not game mechanics.
Right now if something in the "Melee Weapon Damage Calculator" part of the calculator seems strange, chances are I've failed at programming and you should check the Game Mechanic Megathread for confirmation since that's pretty much where I draw the formulas from. Pressing Control + F5 first is a good idea though.