LookupHSCodes
Free U.S. import duty estimator

Import duty calculator

Estimate the U.S. customs duty on any product. Enter a description, get the official HTS code and ad valorem duty rate, then calculate landed cost including MPF and HMF.

How to calculate U.S. import duty

  1. 1

    Describe your product

    Enter a plain-English description (e.g. '100% cotton men's t-shirts').

  2. 2

    Get the HTS code

    LookupHSCodes returns the most likely 10-digit U.S. HTS code with a confidence score.

  3. 3

    See the duty rate

    We show the official ad valorem duty rate from the Harmonized Tariff Schedule.

  4. 4

    Estimate landed cost

    Multiply your declared value by the duty rate and add Merchandise Processing Fee (MPF) and Harbor Maintenance Fee (HMF) where applicable.

U.S. duty formula

Duty   = Customs Value × HTS Ad Valorem Rate
MPF    = max($32.71, min($634.62, Customs Value × 0.003464))
HMF    = Customs Value × 0.00125          (ocean freight only)
Total  = Duty + MPF + HMF + any Section 301 / AD/CVD surcharges

Rates as of 2026. Always confirm Section 301 list and current additional tariffs with USTR before filing.

What you get with LookupHSCodes

  • Official 10-digit HTS code
  • Ad valorem duty rate from HTS
  • Confidence score on every match
  • Bulk CSV upload for full catalogs
  • Saved lookup history
  • Free for 5 lookups / month

FAQ

How is U.S. import duty calculated?
Duty is the declared customs value multiplied by the ad valorem rate for the product's HTS code. Section 301 tariffs, anti-dumping duties, MPF (0.3464%, min $32.71 / max $634.62), and HMF (0.125% on ocean freight) are added on top.
Is this calculator free?
Yes. HTS lookups are free for the first 5 per month. The duty rate shown comes directly from the official Harmonized Tariff Schedule.
Does the calculator include Section 301 China tariffs?
The base HTS duty rate is shown for every product. Section 301 tariffs vary by list and effective date — confirm the current additional rate on USTR.gov for your specific HTS code.
What is MPF?
Merchandise Processing Fee — a U.S. Customs fee of 0.3464% of declared value (minimum $32.71, maximum $634.62 per entry) on formal entries.

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