Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total duty + fees owed
$1,926.96
Duty owed
$1,875.00
Merchandise Processing Fee
$51.96
Effective combined rate
12.85%
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How to use this
- 1Enter declared customs value ($).
- 2Enter base duty rate (%).
- 3Enter additional tariff rate (e.g. section 301) (%).
- 4Enter merchandise processing fee applies.
- 5Read your total duty + fees owed on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Import duty and tariffs are calculated as a percentage of the customs value of goods, generally the price paid or payable (often close to your FOB or ex-works value), not your retail price or landed cost. On top of standard Most Favored Nation duty rates, many products from specific countries carry additional Section 301, anti-dumping, or countervailing duties that stack on top of the base rate. This calculator applies a base duty rate and an additional tariff rate to your declared shipment value, plus the Merchandise Processing Fee that U.S. Customs charges on nearly all formal entries. Enter your total declared goods value, base duty rate, additional tariff rate if applicable, and whether the Merchandise Processing Fee applies. The output shows total duty and fees owed and the effective combined rate, which is the number you should actually use when estimating landed cost rather than relying on the headline duty rate alone.
Worked example
Using the values the calculator loads with:
Inputs
- Declared customs value: 15000 $
- Base duty rate: 5 %
- Additional tariff rate (e.g. Section 301): 7.5 %
- Merchandise Processing Fee applies: Yes — formal entry
Results
- Total duty + fees owed: $1,926.96
- Duty owed: $1,875.00
- Merchandise Processing Fee: $51.96
- Effective combined rate: 12.85%
What each field means
Inputs
- Declared customs value ($)
- The declared customs value used in the calculation, measured in $. Starts at 15000 $ so you have a working example on load.
- Base duty rate (%)
- The base duty rate used in the calculation, measured in %. Starts at 5 % so you have a working example on load. Accepted range: 0–50 %.
- Additional tariff rate (e.g. Section 301) (%)
- The additional tariff rate (e.g. section 301) used in the calculation, measured in %. Starts at 7.5 % so you have a working example on load. Accepted range: 0–100 %.
- Merchandise Processing Fee applies
- Pick the option that matches your situation — the maths changes per option. Choices: Yes — formal entry, No — informal entry under $2,500.
Results
- Total duty + fees owed
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Duty owed
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Merchandise Processing Fee
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Effective combined rate
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's the difference between duty and tariff?
In practice they're often used interchangeably, but 'duty' typically refers to the standard Most Favored Nation rate applied to all imports of that HTS code, while 'tariff' more often refers to additional country- or policy-specific charges layered on top, like Section 301 actions targeting Chinese goods.
What is the Merchandise Processing Fee?
It's a U.S. Customs fee for processing formal entries, calculated at 0.3464% of the entered value, with a minimum of $32.71 and maximum of $634.62 per entry as of recent schedules. Informal entries under $2,500 are typically exempt, and it applies regardless of duty rate.
Does declared value include freight and insurance?
It depends on the valuation method; for most U.S. imports customs value is based on the transaction value (price paid or payable) which typically excludes international freight and insurance if separately identified, but confirm the specific Incoterm and invoice structure with your broker.
How do additional tariffs get applied or removed?
They're tied to specific HTS codes and country of origin combinations set by trade policy actions, and they change with political and trade negotiation cycles. Check the current Federal Register notices or your customs broker for the live rate on your product before committing to a large order.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
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Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Tariff & Duty Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/tariff-duty-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/tariff-duty-calculator" target="_blank" rel="noopener">Tariff & Duty Calculator — RevenueLab</a> (2026).</p>
Source: [Tariff & Duty Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/tariff-duty-calculator) (2026).