Import duty calculator
Pick a tariff line, enter the customs value, and see what US Customs would assess. Handles percentage rates and specific duties charged per kilogram or per unit.
How the number is built
Most lines are ad valorem — a percentage of the customs value:
duty = customs value × rate
About a tenth of US lines are specific — a fixed amount per kilogram or per piece. Those need weight or quantity, not value:
duty = (kg × $/kg) + (units × $/unit)
A few compound lines carry both, which is why the calculator always shows the two parts separately.
What this does not include
- Merchandise Processing Fee — 0.3464% of value, with a floor and cap reset each fiscal year.
- Harbor Maintenance Fee — 0.125% on ocean cargo.
- Section 301 / 232 duties — country- and product-specific, layered on top of the HTS rate.
- AD/CVD — antidumping and countervailing orders, case by case.
- Freight, insurance, and state sales tax on the resale.
Customs value is not the invoice total
US Customs values imported merchandise on the transaction value — what you actually paid for the goods, plus packing costs and any selling commission, minus international freight and insurance. Getting this base wrong shifts the whole calculation: a shipment valued at the landed cost rather than the FOB cost overstates duty, and one that omits a buying commission understates it.
Related-party transactions have their own test. If you buy from an affiliate, the transaction value is only accepted when the relationship did not influence the price — otherwise CBP will look for a fallback valuation method.