Import Duty Calculator: Free U.S. Customs Duty and Fees

Import duty calculator

An import duty calculator estimates what U.S. Customs will collect on a shipment: the duty set by the product's HTS code and origin, plus the processing and harbor fees charged on every entry. Enter an HTS code, origin, customs value and mode of transport to get each amount and the total.

Free, no sign-up, using the live USITC tariff schedule and the current fiscal year's fees.

Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.

The import duty formula

For a typical formal entry arriving by sea:

Duty = customs value × base rate, plus customs value × each Chapter 99 rate that applies
MPF = customs value × 0.3464%, no less than $34.58 and no more than $670.86 (FY2027)
HMF = customs value × 0.125% (ocean only)
Total due to CBP = duty + MPF + HMF

Because of the MPF floor and cap, the fee is a flat $34.58 on shipments under about $9,982 and stops growing above about $193,666.

Worked example: cotton T-shirts

Cotton T-shirts classified under HTS 6109.10.00 carry a general duty rate of 16.5%. For $25,000 of them arriving by ocean, before any origin-specific tariffs:

Duty (16.5% × $25,000)	$4,125.00
MPF (0.3464%)	$86.60
HMF (0.125%)	$31.25
Total	$4,242.85

Origin can change this a lot. Run it from China, from Vietnam or from Honduras (a CAFTA-DR country) to see the difference.

From duty to landed cost

Landed cost is everything it takes to get the goods to your door: the product cost, international freight and insurance, duties and fees, and domestic delivery. The calculator gives you the customs part exactly; add your freight quote and you have the landed cost per unit.

When the calculator says “claim”

Some savings are only available if you claim them: free trade agreement rates, Section 301 exclusions, and certain end-use or quota provisions. The calculator never assumes a claim. It lists the ones that could apply so you can tick them and see what changes, which is how a broker would file it.

Want the full method? Read how to estimate import duty. Comparing suppliers in different countries? Try the tariff simulator.

Frequently asked questions

How is import duty calculated in the U.S.?

Import duty is the customs value multiplied by the duty rate for the product's HTS code. Most rates are a percentage of value; some are specific (for example cents per kilogram) or compound. Additional Chapter 99 tariffs are calculated the same way and added. Customs value is normally the price paid for the goods, excluding international freight and insurance.

What is the Merchandise Processing Fee (MPF)?

The MPF is a CBP user fee of 0.3464% of the customs value on formal entries, with a minimum of $34.58 and a maximum of $670.86 in FY2027. Goods qualifying under some free trade agreements, such as USMCA, are exempt.

What is the Harbor Maintenance Fee (HMF)?

The HMF is 0.125% of the customs value of goods unloaded at U.S. ports from commercial vessels. It does not apply to air, truck or rail shipments.

Does the duty calculator include freight and insurance?

No. U.S. duty is assessed on the customs value, which excludes international freight and insurance. Add those costs separately when you work out a landed cost.

Are antidumping and countervailing duties included?

They are flagged, not added. AD/CVD cash deposit rates depend on the specific producer and exporter, so the calculator lists the active cases for the product and origin for you to check.