Customs Tariff Calculator

Open any real tariff schedule and a large share of the lines are not percentages. You will find duties stated as an amount per hundred kilograms, per litre of pure alcohol, per thousand units, as a percentage plus a fixed amount, or as two alternatives with instruction to charge whichever is greater. Percentage-only calculators simply cannot process these lines, which is why so much agricultural, beverage, textile and sugar trade gets budgeted wrongly.

Customs Tariff Calculator handles the expressions as written. Ad valorem, specific by any unit of quantity, compound where both apply, and alternative duties where the greater or lesser of two branches binds. Tariff rate quotas are modelled properly too: enter the quota volume and how much has already been drawn, and the tool splits your shipment between the in-quota and out-of-quota rates rather than assuming you get the whole thing at the preferential figure.

Everything is then converted to an ad valorem equivalent — the duty expressed as a percentage of your actual shipment value. That single conversion is what makes duty types comparable. It reveals that a fixed charge per kilogram is negligible on high-value goods and punishing on commodities, shows you whether the specific or the percentage branch of an alternative duty is actually binding, and lets you set an MFN rate, several preferential rates and the WTO bound rate side by side and see which genuinely costs least for the shipment in front of you.

• Every duty expression type: Ad valorem, specific, compound (both applied and summed), and alternative duties charging the greater or the lesser of two branches.
• Ten quantity bases: Per kg, per 100 kg, per tonne, per litre, per litre of pure alcohol, per unit, per thousand units, per pair, per square metre and per cubic metre.
• Alcohol content handling: Duties per litre of pure alcohol calculated from volume and ABV, as beverage tariff lines require.
• Ad valorem equivalent for everything: Every duty type converted to a percentage of your shipment value so comparisons are meaningful.
• Tariff rate quota split: Enter quota volume and quantity already drawn, and the shipment is divided between in-quota and out-of-quota rates with each priced separately.
• Multi-rate comparison: MFN, up to three preferential rates and the WTO bound rate costed side by side with AVEs and savings against MFN.
• Binding-branch identification: For alternative duties, shows which branch applies and at what value the binding branch would switch.
• Binding overhang readout: The gap between applied and bound rates, showing how much legal headroom a country retains to raise duties.
• Price sensitivity table: AVE across a range of unit values, exposing how regressive a specific duty is for your product.
• Correct base per component: Ad valorem components use the customs value on your chosen CIF or FOB basis; specific components use physical quantity, unaffected by valuation.
• Entirely client-side: No rate database, no account, nothing uploaded.

1. Enter your shipment. Customs value on the correct basis for the destination, plus the physical quantity in whichever unit your tariff line uses.
2. Choose the duty expression type. Match it to how the tariff line is actually written — this is the step that most calculations get wrong before any arithmetic happens.
3. Enter the components. A percentage, a specific amount with its unit, or both for a compound duty. For alternative duties, enter both branches and select greater or lesser.
4. Add the quota if one applies. Enter the quota volume, the amount already drawn and the out-of-quota rate. The split is calculated for you.
5. Add the comparison rates. MFN, any preferential rates you may qualify for, and the bound rate from the WTO schedule.
6. Read the ad valorem equivalents. This is the comparable figure. A specific duty and a percentage duty only become comparable once both are expressed against your shipment value.
7. Check the sensitivity table. If your product is price-volatile and the duty is specific or compound, the AVE moves even when the tariff does not.
8. Verify before relying on preference. A preferential rate is claimed and conditional — confirm origin rules and documentation before pricing on it.

Example 1 — A compound duty on dairy. A tariff line reads 14.4 percent plus 120 per 100 kg. On 8,000 kg with a customs value of 24,000, the ad valorem component is 3,456 and the specific component is 9,600, giving 13,056 in total — an ad valorem equivalent of 54.4 percent. The headline 14.4 percent captures barely a quarter of the real burden, which is why compound lines are so often underestimated at quoting stage.

Example 2 — A specific duty and price sensitivity. A duty of 2.50 per kg on goods worth 25 per kg is an AVE of 10 percent. If the supplier drops the price to 15 per kg, the AVE rises to 16.7 percent — the duty has not changed but its burden has grown by two thirds. Specific duties partially cancel supplier price reductions, and the sensitivity table makes that visible before you renegotiate.

Example 3 — An alternative greater-of duty. A line charges the greater of 12 percent or 1.80 per kg. At a unit value of 20 per kg the percentage branch gives 2.40 and the specific gives 1.80, so the percentage binds. Below 15 per kg the specific branch takes over and duty stops falling with value — the floor is the point of the mechanism, and knowing where it sits tells you whether a price reduction will yield any duty saving at all.

Example 4 — A partially exhausted quota. A quota of 50,000 kg at 2 percent in-quota and 38 percent out-of-quota already has 46,000 kg drawn. Your 9,000 kg shipment gets 4,000 kg in-quota and 5,000 kg out-of-quota, blending to an effective rate far above the in-quota figure. Budgeting the whole consignment at 2 percent would understate the duty by an order of magnitude.

• Process the tariff line as written: Specific, compound and alternative duties are the norm in agriculture, beverages and textiles, not exotic exceptions.
• Compare duty types honestly: Ad valorem equivalents are the only basis on which a percentage and a per-kilogram charge can be weighed against each other.
• See the real burden on commodities: Specific duties that look modest can exceed fifty percent AVE on low-unit-value goods.
• Know where the alternative branch switches: If the specific branch binds, cutting your purchase price saves nothing on duty.
• Model quota exhaustion realistically: Quotas are shared and drawn down by everyone, so assuming full in-quota treatment is optimistic.
• Size the preference opportunity: Seeing the saving against MFN tells you whether origin compliance work is worth the effort.
• Understand the headroom: The gap between applied and bound rates is how much a destination could legally raise duties without breaching its commitments.
• Free and private: No sign-up, nothing uploaded, and no rate database pretending to be current.