How this calculator works
A tariff is a tax on imported goods, usually charged as a percentage of the declared value. This calculator first works out how many packs are needed for the rolls you want, rounding up to whole packs, then multiplies by the pre-tariff pack price to get the base cost. The tariff amount is that base cost times the rate. The after-tariff cost is the base plus the tariff, and the increase is the same percentage rate, because the model applies the tariff to the whole purchase rather than to individual units differently.
Formula
Packs needed = rolls needed / rolls per pack, rounded up. Cost before tariffs = packs x price per pack. Tariff added = cost before x tariff rate. Cost after tariffs = cost before + tariff added. Increase = tariff rate, shown as a percentage.
Worked example
Twenty four rolls in packs of 12 is two packs. At 10 a pack the pre-tariff cost is 20. A 25 percent tariff adds 5, so the cost after the tariff is 25. Buying 25 rolls instead needs three packs, which costs 30 before the tariff, adds 7.50 and comes to 37.50.
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Frequently asked questions
Is the tariff always applied to the retail price?
No. Customs duties are normally charged on the declared value at the border, which may be a wholesale or import price rather than the shelf price. This calculator applies the rate to the price you enter, so use the import value if you know it, or treat the result as an upper estimate based on retail pricing.
Why does buying more rolls cost so much more?
Packs are indivisible. Going from 24 to 25 rolls crosses a pack boundary, adding a whole pack rather than one roll. Buying in packs that match your need avoids paying for rolls you will not use soon.
Can a tariff be negative?
A negative tariff would be a subsidy or a refund, which does not fit the usual meaning of the word. The calculator rejects negative rates, but you can enter a zero rate to model a purchase with no tariff.
Does the calculator include sales tax?
No. It models the tariff only. Sales taxes, shipping and handling are separate charges and should be added to the after-tariff figure if you want the full amount at checkout.