What a unit really earns, what a run costs to ship, and a SKU scheme that still reads clearly a year from now. No login, nothing saved, no limit.
Type a unit cost, a retail price and the real dimensions. It gives back landed cost, Amazon's fees and what is actually left.
How many cartons fit a pallet, what the run measures in CBM, and roughly what the freight will cost.
Consistent SKU codes built from your brand, category and variants — so the catalogue still reads clearly a year from now.