About the tariff simulator

Flexport’s US Tariff & Import Duty Calculator is a free app that lets you see exactly what U.S. Customs will charge for any commodity—under every relevant scenario and parameter—in seconds. Type or paste your 10-digit HTS (HS) code, pick an origin country, and the tool instantly returns:

• The duty rate and any Section 301/232 surcharges—fully aligned with the latest Trump-era lists and subsequent modifications.
• A side-by-side rate comparison for alternative sourcing countries, so you can model “what-if” moves out of China or into Mexico/Vietnam.
• Flags for preferential trade programmes (USMCA, DR-CAFTA, KRFTA, etc.) that could take your duty to 0 %.
• A plain-English breakdown of how the charge is calculated, including ad-valorem, specific, and combination rates.
• Automatic adjustment for the entry date and date of loading, ensuring the duty rate shown is the one that will actually apply on the day your goods clear customs.
• Precise Section 232 calculations that factor in the declared percentage of steel or aluminium content for products subject to metal duties.
• Instant surfacing of special programme indicators (SPI)—e.g. codeP” for DR-CAFTA or “S” for USMCA—so you never miss an eligibility-driven reduction.

No signup, no paywall—just actionable numbers you can trust when negotiating FOB prices, calculating landed cost, or answering “What happens if Trump changes tariffs again?” for your CFO.

Tariff Simulator Philosophy

The tool is targeted towards trade compliance professionals who already have their HTS codes. Accordingly, the search bar is only based on the HTS language, not common language. For example, “computers” does not appear in the search since these are considered “Automated Data Processing Machines” of heading 8471 in the HTS language.

The data powering this tool is based on official announcements only. Anything that is on social media, stated at press conferences, or said in news media by the administration will not be incorporated into the tool. Only Federal Register Notices, Executive Orders, or CSMS based guidance will be incorporated into the calculator.

This tool is intended to automatically apply or remove special codes based on dates, exclusions, or other data inputs. As you change input data, special codes will appear and disappear based on the published rules from CBP.