Trump Tariff Calculator

Estimate the U.S. import duty on a shipment by applying a base MFN rate plus an additional tariff rate to its customs value, then see the total duty owed and landed cost.

Quick Facts

Formula
Duty = Customs Value x (Base Rate + Additional Rate)
Ad valorem duty is a percentage of the dutiable value, not the shipment's retail price.
Dutiable base
Customs (FOB) value only
U.S. duty is normally assessed on the goods' value, excluding international freight and insurance.
Who pays
The importer of record
Duty is paid to U.S. Customs and Border Protection at entry, then often passed through in pricing.

Your Results

Calculated
Base duty
-
Value x base MFN rate
Additional tariff
-
Value x additional rate
Total duty owed
-
Base duty + additional tariff
Total landed cost
-
Value + duty + freight/other costs

Ready

Enter the customs value, base rate, and additional tariff rate, then press Calculate.

How the Trump Tariff Calculator works

U.S. import duties on most goods are "ad valorem," meaning they are charged as a percentage of the goods' customs value rather than a flat fee per unit. This calculator applies that standard formula and lets you separate the normal baseline duty from any additional tariff layered on top — the kind of additional Section 301, IEEPA, or reciprocal tariff rates announced during the Trump administration on goods from specific countries or product categories.

The formula

For a customs value V, a base (Most Favored Nation) rate rbase, and an additional tariff rate radd, expressed as decimals:

Base duty = V x rbase
Additional tariff = V x radd
Total duty = Base duty + Additional tariff = V x (rbase + radd)

Total landed cost then adds the duty and any freight, insurance, or handling charges on top of the customs value: Landed cost = V + Total duty + Other costs. U.S. Customs and Border Protection (CBP) normally assesses ad valorem duty on the FOB customs value of the merchandise itself, not on international freight or insurance, so this calculator keeps those costs out of the dutiable base.

Worked example

Take a shipment with a declared customs value of $10,000, a 3.5% base MFN rate, and a 10% additional tariff rate, plus $500 of freight and insurance. The base duty is $10,000 x 3.5% = $350. The additional tariff is $10,000 x 10% = $1,000. Total duty owed is $1,350, and the total landed cost is $10,000 + $1,350 + $500 = $11,850 — an effective combined tariff rate of 13.5% of the declared value.

What moves the duty most

  • Customs value: duty scales linearly with the declared value — doubling the value doubles both the base duty and the additional tariff.
  • Additional tariff rate: this is the field that varies the most between products and countries of origin. Trade actions since 2018 have layered additional rates ranging from roughly 10% baseline reciprocal tariffs up to well over 100% on specific product-country combinations during periods of escalation.
  • Rate stacking: base and additional rates are additive, not compounding, in this calculator — the standard treatment for most stacked U.S. tariff actions on a single entry.

Important caveats

This calculator computes a standard ad valorem estimate only. It does not account for tariff-rate quotas, exclusions, first-sale valuation, de minimis thresholds, product-specific specific or compound duty structures, or the Harmonized Tariff Schedule classification that determines which rates actually apply to a given product. Actual duty rates change based on trade policy and can vary by product classification and country of origin — always confirm the applicable rate for your specific product using the current Harmonized Tariff Schedule or a licensed customs broker before making an import decision. This tool provides an estimate for planning purposes, not customs or trade advice.

Frequently Asked Questions

How is a tariff on imported goods calculated?
Most U.S. tariffs are ad valorem, meaning the duty is a percentage of the customs (dutiable) value of the goods: Duty = Customs Value x Tariff Rate. This calculator adds a base Most Favored Nation duty rate and an additional tariff rate (such as a Section 301, IEEPA, or reciprocal tariff) together, then applies the combined rate to the declared value.
What is the difference between the base rate and the additional tariff rate?
The base rate is the normal Most Favored Nation duty that applied to a product before any additional trade action. The additional rate represents extra tariffs layered on top, such as Section 301 China tariffs, IEEPA emergency tariffs, or reciprocal tariffs announced during the Trump administration. The two rates are added together and both apply to the same customs value.
Is the tariff charged on the shipping and insurance cost too?
Generally no. U.S. Customs and Border Protection assesses ad valorem duty on the FOB (free on board) customs value of the merchandise itself, not on international freight or insurance charges. This calculator keeps freight, insurance, and other landed-cost items separate from the dutiable value for that reason.
Who actually pays the tariff?
The importer of record — typically the U.S. business or individual bringing the goods into the country — pays the duty to U.S. Customs and Border Protection at the time of entry. Importers commonly pass some or all of that added cost on to customers through higher prices, though this calculator only estimates the duty itself, not how it is subsequently priced into a product.

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