Our Mission
CalcMyTariff.com exists because US tariff policy in 2026 is at its most complex since 1947. Multiple overlapping tariff programs — Section 122 global surcharges, Section 232 product-specific duties, Section 301 China tariffs, bilateral trade deals, and USMCA exemptions — create a stacking puzzle that most importers cannot solve without expensive customs brokers.
The average effective US tariff rate is at its highest since 1947 — see the live Tax Foundation Tariff Tracker for the current weighted figure. The de minimis exemption ($800 duty-free threshold) has been suspended. Every shipment now faces layered tariffs that interact in non-obvious ways.
We built a free, instant calculator to democratize this information. Amazon FBA sellers, small business importers, and e-commerce operators deserve the same tariff clarity that Fortune 500 companies get from their customs brokers.
How We Calculate
Our tariff stacking engine applies the following formula for every country-product combination:
- MFN Base Rate: Most Favored Nation rate — the default WTO-bound tariff
- Section 122 Surcharge: Global uniform surcharge — lapsed to 0% on July 24, 2026 when its 150-day statutory limit expired, so it no longer contributes to the max() term
- Section 232 Duties: Product-specific duties on steel (50%), aluminum (50%), copper, lumber, autos
- Section 301: Additional tariffs on Chinese goods only, stacked on top
- Forced-labor Section 301: A separate additive duty (10% or 12.5%) covering roughly 60 economies, effective July 24, 2026 — it backfilled the lapsed Section 122 surcharge
- Section 338: A 50% retaliatory duty on Canadian goods under 19 U.S.C. 1338, effective August 19, 2026. It applies only to annexed, non-Section-232 goods — and it is the one layer a USMCA preference claim does not waive
- USMCA: Qualifying goods from Canada or Mexico receive 0% on every layer except Section 338, which from August 19, 2026 a USMCA preference claim does not defeat
Landed cost also includes MPF (0.3464%, min $33.58, max $651.50) and HMF (0.125%, ocean only). Read our full tariff stacking guide →
Our Data Sources
Tariff rates are sourced from six authoritative organizations and cross-referenced before publication:
- Tax Foundation — Country-level effective tariff rates and real-time trade policy tracking
- US International Trade Commission (USITC) — Official HTS and MFN base rates
- Federal Register — Executive proclamations, presidential trade actions, and the legal text of Section 122 + Section 232 enactments
- U.S. Customs and Border Protection (CBP) — MPF/HMF fee rates and CSMS bulletins on operational tariff changes at ports of entry
- Office of the U.S. Trade Representative (USTR) — Section 301 actions against China, list-by-list product coverage, and exclusion announcements
- Penn Wharton Budget Model — Trade volume, economic impact modeling, cross-verification
No rate is published unless confirmed across at least two independent sources. See our editorial policy.
Coverage
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