Spring clips weigh next to nothing, so no. Competition collars are 2.5 kg each, so take 5 kg off your plates if you use them.

Which plates does it use?

25, 20, 15, 10, 5, 2.5 and 1.25 kg, or 45, 35, 25, 10, 5 and 2.5 lb. That's what most gyms have on the rack.

Does it work in pounds?

Yes. Switch the unit to lb and both the bar and the plates switch to pound sizes.

Type the weight you want on the bar and pick your bar. You get the plates for each side, heaviest first, so you load it once and lift.

Target weight

Bar

On the bar100kg

Bar weight20kg

Load the heaviest plate first, innermost on the sleeve.

Take the bar off your target, split the rest in two, and fill each side from the heaviest plate down.
In kg the smallest plate is 1.25, so the bar moves in 2.5 kg jumps. In lb it is 2.5, so 5 lb jumps. Anything in between rounds down.
A standard bar is 20 kg or 45 lb, a women's bar 15 kg or 35 lb, an EZ curl bar about 10 kg or 25 lb. Weigh yours if the gym's bars are odd.

Do collars count?: Spring clips weigh next to nothing, so no. Competition collars are 2.5 kg each, so take 5 kg off your plates if you use them.
Which plates does it use?: 25, 20, 15, 10, 5, 2.5 and 1.25 kg, or 45, 35, 25, 10, 5 and 2.5 lb. That's what most gyms have on the rack.
Does it work in pounds?: Yes. Switch the unit to lb and both the bar and the plates switch to pound sizes.

Swole.fit plans your next sets in weights you can actually load and logs every lift. Free for normal training, no card.