What you actually clear
A card that sells for $190 does not pay you $190. The marketplace takes its percentage of the total the buyer paid — including the shipping they were charged — and your own postage comes out after that. Do this before you buy, not after you sell: it is the net that has to beat what the card cost you.
Enter a sale price to see the breakdown. Everything else is optional — with only a price you get the fee and the net.
The fee is charged on the total, including shipping. That is the line people get wrong, and it is why free shipping is never free — the postage the buyer paid is part of the amount the percentage is taken from.
The rate above is an approximation and yours may differ. A marketplace take moves with category, store subscription, promoted-listing rate and international surcharges; a promoted listing alone can add several points. It defaults to 13.35%, the same assumption this site uses everywhere else, so the tool and the product cannot quietly disagree — but change it to your own and every figure moves.
Grading belongs in the cost, not beside it. A slab's submission cost is part of what the card owes you before it makes money. Whether submitting was worth it in the first place is a different question — the break-even calculator answers that one.
The reasoning behind all of this, worked through at length, is in what you actually clear when you sell a Bowman card.