Best US Tariff Calculators Compared (2026)

What these tools are actually for

Split them by the question you have:

• What is the US duty on this HTS line from this country? A US tariff calculator or the USITC schedule.
• What should the shopper pay at checkout, including foreign VAT? A cross-border landed-cost product.
• What do I file on the 7501? A customs broker, or broker software. A website calculator does not file the entry.

None of the tools below is a CBP binding ruling. Classification stays with the importer of record.

TariffsTool

The tariff calculator is free and does not require an account. You search an HTS line or pick a product category, choose the country of origin, and enter a value. The same function stacks Column 1, China Section 301, Section 232 (including the metal and auto rules this dataset models), Section 338 where this dataset has it, the Section 301 forced-labor tariff, and the EU ceiling where it applies. Open the freight fields and it adds your freight, an estimated MPF (FY2026 formal floor $33.58, ceiling $651.50), and ocean HMF at 0.125%. The landed cost calculator is the category version of that math. The HTS lookup is the schedule browser. Dated changes are on the changelog.

Limits, stated here so they are not implied: the rates are a curated static snapshot, not a live feed from hts.usitc.gov. It is not a binding classification. It does not track the UK passenger-vehicle quota. It does not file an entry, screen a denied-party list, or guarantee a duty quote against whatever CBP assesses. The API exposes the same estimate.

Flexport Tariff Simulator

Flexport's Tariff Simulator page says the core tool estimates US import duties from shipment value, country of origin, and HTS classification, that it is free to start, and that the company commits to reflecting an official tariff change within 48 hours. The same page says a lookup without an account covers up to 10 HTS codes, and that signing in to Tariff Simulator Pro adds bulk HTS uploads, PGA requirements, side-by-side country comparisons, and email alerts. The about page describes 10-digit HTS input, Section 301 and Section 232, trade-program flags, and a public changelog. The simulator app has also displayed a smaller free-search counter than the "10 codes" line, so the unpaid limit is whatever that page shows when you open it.

Flexport does not publish a Pro price on those pages. This comparison does not guess one, and it does not claim either calculator matches CBP more closely than the other.

Cervo tariff simulator

Cervo's tariff simulator takes shipment value, country of origin, mode of transport, and an entry date. Cervo's site describes the simulator as a way to see Section 232, Section 301, IEEPA, and AD/CVD duties stack, and describes the broader product as broker software: invoice extraction, HTS recommendations, PGA screening, and draft 7501s pushed to an ABI system. The homepage says Cervo has been acquired by Altana Technologies. No public price for the simulator or the brokerage platform is stated on those pages, so none is repeated here.

IEEPA reciprocal duties were struck down and are not a current layer in this site's calculator. A tool that still offers an IEEPA scenario is answering a different question (what was assessed, or what a filing system still has coded), not the duty this site charges on a 2026 entry.

Avalara and Zonos

These two are checkout and landed-cost products, not drop-in copies of a US broker worksheet.

Avalara AvaTax Cross-Border, on Avalara's page, calculates customs duties and import taxes, and also VAT, GST, and sales tax. Avalara says a real-time duty calculation needs an HS or HTS code, and that an estimated mode can run without one on a new transaction. It sells classification separately (Avalara Tariff Code Classification). No standalone "free US tariff simulator" price is stated there.

Zonos Landed Cost, on zonos.com/landed-cost, calculates duties, taxes, and fees and says that if customs charges more than the Zonos quote, Zonos pays the difference. Zonos's docs say the calculation supports up to 10-digit HS codes and, in the supply-chain guide, calculations for many countries. That guarantee is Zonos's claim about Zonos's quote. It is not a claim this site makes about its own estimate.

Use either when the problem is a shopper's checkout total, including foreign tax. Use a US HTS calculator when the problem is the US duty stack on a known classification.

The USITC schedule, and a broker

The legal US duty columns are the Harmonized Tariff Schedule at hts.usitc.gov. That is the primary source. It is a schedule, not a stacking calculator: you still have to apply the Chapter 99 headings, the country, and the current notes yourself. USITC DataWeb (dataweb.usitc.gov) is trade statistics — value and quantity by country — not the duty rate.

A licensed customs broker classifies the goods, files the entry, and is the person CBP will talk to about the 7501. Broker software that prepares the entry is in a different category from any of the free simulators above. This site does not file entries.

If the search was for a subscription that alerts you when a vehicle or parts rate changes, Flexport is the vendor in this set that publishes an email alert on its Pro tier. This site publishes a dated changelog instead of an alert subscription. No price for a "vehicle and parts tariff subscription" is invented here.

How to choose without a fake ranking

Match the tool to the job.

• You have an HTS code and a US origin question, and you want a free estimate of the stack this dataset models: the tariff calculator.
• You want the vendor's own words on a logistics-company simulator with a published update clock: Flexport.
• You are a brokerage shopping entry software, and the simulator is a demo of that platform: Cervo.
• You need duty plus foreign VAT at checkout: Avalara or Zonos, and you read their own guarantee and coverage pages before you rely on them.
• You need the rate CBP will hold you to: hts.usitc.gov and the broker who files.

A calculator that cannot show its layers is not checkable. On this site the breakdown is the check. On the USITC site the columns are the check.