US Customs Import Duty Calculator
United States import duty on most goods is ad valorem: a percentage of the customs value set by the product's classification in the Harmonized Tariff Schedule. This calculator takes your customs value and the HTS duty rate for your product, computes the duty, then adds the merchandise processing fee using the rate and the published minimum and maximum you supply. Because tariff rates and fee bounds depend on classification, country of origin, and current regulations, every empirical figure here is a user-editable input you should confirm against the official HTS and CBP sources before relying on it.
Import duty formula
Duty = customs value * (duty rate / 100)
Raw MPF = customs value * (MPF rate / 100)
MPF = min(max(raw MPF, MPF minimum), MPF maximum)
Total charges = duty + MPF
Landed (goods + charges) = customs value + total charges
Specific or compound tariff rates (per unit, or per unit plus ad valorem) are not modelled here. For those, use the per-unit calculation specified in the HTS for your classification.
US import context
- Duty rates depend on the 10-digit HTS classification of the goods and the country of origin.
- Free-trade agreements and special programs can reduce or eliminate duty for qualifying goods.
- The merchandise processing fee applies to most formal entries and is bounded by a minimum and maximum that are periodically adjusted.
- Additional duties such as antidumping, countervailing, or Section 301 tariffs may apply on top of the base HTS rate.
- This estimate excludes broker fees, harbor maintenance fee, and excise taxes.
Import duty: frequently asked questions
How is US import duty calculated?
For most goods, duty is ad valorem: duty equals the customs value times the duty rate from the Harmonized Tariff Schedule (HTS). The customs value is generally the price actually paid for the goods (transaction value). This calculator multiplies your entered value by the HTS rate you provide.
Where do I find the duty rate for my product?
Look up your product's HTS classification and the corresponding duty rate in the Harmonized Tariff Schedule maintained by the U.S. International Trade Commission. The rate is column-1 general for most-favored-nation countries. Enter that rate into the calculator as a user-editable input.
What is the merchandise processing fee?
U.S. Customs and Border Protection charges a merchandise processing fee (MPF) on most formal entries. It is an ad valorem percentage of the goods value subject to published minimum and maximum amounts. Because those bounds change, this calculator lets you enter the MPF rate, minimum, and maximum.
Is shipping included in the customs value?
The customs value for U.S. imports is generally the transaction value of the goods themselves (FOB-style), with international freight and insurance treated separately for valuation purposes. Confirm the correct dutiable value rules with CBP for your specific entry type.
Does the de minimis threshold apply?
Low-value shipments below a published de minimis threshold may enter free of duty under informal entry rules. Thresholds and exceptions change; verify current de minimis treatment with CBP before assuming a shipment is duty-free.
Official sources
- U.S. International Trade Commission: Harmonized Tariff Schedule.
- U.S. Customs and Border Protection: CBP home (duties and fees).
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.