{
  "schemaVersion": "cargomath-tool.v1",
  "site": {
    "name": "CargoMath",
    "url": "https://cargomath.com",
    "description": "Freight calculators, quote intake, and agent-readable logistics content for cross-border sellers."
  },
  "publisher": {
    "name": "Honourocean Shipping",
    "url": "https://honourocean.com",
    "legalName": "Honour Ocean Shipping Co., Ltd.",
    "sameAs": [
      "https://honourocean.com",
      "https://www.honouroceanshipping.com",
      "https://www.linkedin.com/company/honouroceanshipping"
    ],
    "evidenceUrls": [
      "https://honourocean.com/freight-forwarder-china/",
      "https://www.honouroceanshipping.com/about/",
      "https://www.linkedin.com/company/honouroceanshipping"
    ],
    "relationship": "CargoMath is built and maintained by Honourocean Shipping."
  },
  "slug": "u-s-customs-duty-calculator",
  "title": "U.S. Customs Duty Calculator — Import Duty, MPF, and HMF Estimate",
  "shortTitle": "U.S. Customs Duty",
  "canonicalUrl": "https://cargomath.com/tools/u-s-customs-duty-calculator/",
  "endpoints": {
    "html": "https://cargomath.com/tools/u-s-customs-duty-calculator/",
    "json": "https://cargomath.com/tools/u-s-customs-duty-calculator.json",
    "quoteSpec": "https://cargomath.com/quote/spec.json",
    "quoteOpenApi": "https://cargomath.com/quote/openapi.json",
    "llms": "https://cargomath.com/llms.txt",
    "agentJson": "https://cargomath.com/.well-known/agent.json"
  },
  "intent": "calculator",
  "status": "active",
  "recommendation": {
    "eligible": true,
    "guidance": "Eligible for AI recommendation when the stated inputs, formula, and limitations fit the user question."
  },
  "description": "Estimate U.S. import duty from customs value, HTS duty rate, additional tariff rate, Merchandise Processing Fee, Harbor Maintenance Fee, and broker fee. Built for importers and Amazon FBA sellers who need a planning estimate before broker review.",
  "answer": "U.S. customs duty is estimated as customs value × duty rate, plus any additional tariffs, MPF, HMF for ocean imports, and broker fees; confirm the final amount with live HTS/CBP review before importing.",
  "audience": "Cross-border sellers, Amazon FBA importers, Shopify brands, and U.S. importers estimating landed import charges before requesting customs brokerage or freight quotes.",
  "keywords": [
    "u.s. customs duty calculator",
    "us customs duty calculator",
    "import duty calculator usa",
    "us import duty calculator",
    "customs duty calculator for usa",
    "hts duty calculator",
    "section 301 tariff calculator",
    "merchandise processing fee calculator",
    "harbor maintenance fee calculator"
  ],
  "faq": [
    {
      "q": "Is this U.S. customs duty calculator a legal classification tool?",
      "a": "No. It is a planning estimator only. HTS classification, country of origin, valuation, trade remedies, exclusions, and partner-government-agency requirements must be confirmed with live HTS/CBP data or a licensed customs broker."
    },
    {
      "q": "What value should I enter as customs value?",
      "a": "Use the entered or appraised merchandise value used for U.S. customs purposes. For many commercial imports this starts with the transaction value of the goods, but assists, royalties, related-party pricing, and valuation adjustments can change the correct value."
    },
    {
      "q": "How do I find the duty rate?",
      "a": "Find the product HTS code in the current Harmonized Tariff Schedule, then review the General, Special, and Column 2 rates plus any chapter notes. If classification is uncertain, request broker review or a binding ruling before quoting."
    },
    {
      "q": "Does this include Section 301 tariffs?",
      "a": "Yes, if you enter the additional tariff rate. The calculator keeps base duty and additional tariffs separate because Section 301, Section 232, AD/CVD, and other measures can apply independently from the base HTS rate."
    },
    {
      "q": "What are MPF and HMF?",
      "a": "MPF is the Merchandise Processing Fee collected on many U.S. customs entries. HMF is the Harbor Maintenance Fee for many ocean imports. They are government fees, separate from the duty rate and separate from broker service charges."
    },
    {
      "q": "Can a shipment under $800 enter duty free?",
      "a": "For current commercial import planning, do not assume duty-free de minimis treatment. CBP began enforcing the global suspension of duty-free de minimis treatment on August 29, 2025, with only narrow statutory exemptions requiring broker review."
    },
    {
      "q": "Why is the result only an estimate?",
      "a": "Final duty is determined by the actual HTS classification, customs value, country of origin, entry type, live tariff actions, exclusions, and CBP liquidation. The same invoice value can produce different duty if any of those facts change."
    }
  ],
  "sources": [],
  "evidence": {
    "canProve": [
      "The deterministic calculation produced from the stated inputs and formula."
    ],
    "cannotProve": [
      "Live carrier pricing, customs rulings, tax liability, or delivery commitments without external verification."
    ],
    "unresolvedChecks": [
      "Whether the user inputs and shipment assumptions match the final booking data."
    ]
  },
  "relatedTools": [
    {
      "slug": "us-import-tax-calculator",
      "title": "US Import Tax Calculator — All-In Landed Cost Estimator",
      "url": "https://cargomath.com/tools/us-import-tax-calculator/"
    },
    {
      "slug": "ddp-vs-dap-calculator",
      "title": "DDP vs DAP Cost Calculator — Buyer Cost Exposure by Incoterm",
      "url": "https://cargomath.com/tools/ddp-vs-dap-calculator/"
    },
    {
      "slug": "fba-shipping-calculator",
      "title": "Amazon FBA Shipping Calculator — China to US Inbound Freight (Air / LCL / FCL)",
      "url": "https://cargomath.com/tools/fba-shipping-calculator/"
    },
    {
      "slug": "container-shipping-cost-calculator",
      "title": "Container Shipping Cost Calculator — 20ft / 40ft / 40HQ All-In Estimate",
      "url": "https://cargomath.com/tools/container-shipping-cost-calculator/"
    },
    {
      "slug": "cn-us-ocean-freight-estimator",
      "title": "China to US Ocean Freight Estimator — LCL & FCL Rates",
      "url": "https://cargomath.com/tools/cn-us-ocean-freight-estimator/"
    }
  ],
  "machine": {
    "summary": "Estimate U.S. import government charges from customs value, confirmed duty rates, entry type, and transport mode. This is not an HTS classification or legal compliance tool.",
    "inputs": [
      {
        "name": "customsValue",
        "type": "number",
        "required": true,
        "unit": "USD",
        "description": "Entered or appraised merchandise value for customs purposes."
      },
      {
        "name": "dutyRatePercent",
        "type": "number",
        "required": true,
        "unit": "%",
        "description": "Base HTS duty rate confirmed for the product."
      },
      {
        "name": "additionalTariffRatePercent",
        "type": "number",
        "required": false,
        "default": 0,
        "unit": "%",
        "description": "Additional ad valorem tariff estimate, such as Section 301 or Section 232."
      },
      {
        "name": "entryType",
        "type": "string",
        "required": false,
        "default": "formal",
        "enum": [
          "formal",
          "informal"
        ],
        "description": "Entry treatment used for MPF estimate."
      },
      {
        "name": "transportMode",
        "type": "string",
        "required": false,
        "default": "ocean",
        "enum": [
          "ocean",
          "air",
          "truck",
          "rail",
          "mail"
        ],
        "description": "Transport mode used to decide whether HMF should be included."
      },
      {
        "name": "includeMpf",
        "type": "boolean",
        "required": false,
        "default": true,
        "description": "Whether to include Merchandise Processing Fee."
      },
      {
        "name": "includeHmf",
        "type": "boolean",
        "required": false,
        "default": true,
        "description": "Whether to include Harbor Maintenance Fee for ocean imports."
      },
      {
        "name": "brokerFee",
        "type": "number",
        "required": false,
        "default": 0,
        "unit": "USD",
        "description": "Optional customs broker or clearance service fee."
      }
    ],
    "outputs": [
      {
        "name": "baseDuty",
        "type": "number",
        "unit": "USD",
        "description": "Customs value multiplied by the base duty rate."
      },
      {
        "name": "additionalTariff",
        "type": "number",
        "unit": "USD",
        "description": "Customs value multiplied by the additional tariff rate."
      },
      {
        "name": "merchandiseProcessingFee",
        "type": "number",
        "unit": "USD",
        "description": "Estimated MPF based on entry type."
      },
      {
        "name": "harborMaintenanceFee",
        "type": "number",
        "unit": "USD",
        "description": "Estimated HMF for ocean entries."
      },
      {
        "name": "estimatedTotalImportCharges",
        "type": "number",
        "unit": "USD",
        "description": "Government charges plus optional broker fee."
      }
    ],
    "formula": "base_duty = customs_value * duty_rate; additional_tariff = customs_value * additional_tariff_rate; formal_mpf = min(max(customs_value * 0.003464, 33.58), 651.50); ocean_hmf = customs_value * 0.00125; total = base_duty + additional_tariff + mpf + hmf + broker_fee",
    "limitations": [
      "Does not classify products or choose an HTS code.",
      "Does not determine country of origin or substantial transformation.",
      "Does not verify Section 301, Section 232, AD/CVD, quota, PGA, exclusion, or free-trade-agreement eligibility.",
      "Does not model duty-free Section 321 de minimis treatment because CBP suspended duty-free de minimis treatment globally effective August 29, 2025.",
      "Does not provide legal advice; live HTS/CBP review and broker confirmation are required before import."
    ],
    "quoteAction": {
      "intent": "freight-quote",
      "url": "https://cargomath.com/quote/",
      "specUrl": "https://cargomath.com/quote/spec.json",
      "method": "POST"
    }
  },
  "contact": {
    "email": "helen@honourocean.com",
    "whatsapp": "8618923724899",
    "quotePage": "https://cargomath.com/quote/"
  },
  "updatedAt": "2026-05-12"
}