That requires you to know when the item was imported. The tarrif forecast is a harder business than mid level wizardry.

My favorite brand drops a new pair of shoes in June. I order them shortly thereafter. They are imported from China who at the time has a 100% tariff. I see a $5 tariff charge. I now know that the $250 pair of shoes actually cost the retailer $5 and my boyfriend who keeps telling me they are cheap trash is suddenly vindicated.