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ShipMargin

31 calculators · data checked Tue, 18 Aug 2026

Shipping, customs and seller-profit calculators that show their work

Chargeable weight, import duty, landed cost, marketplace fees and net margin — with the formula, the source and the effective date behind every figure. Free, no sign-up, and they run entirely in your browser.

Dimensional weight Customs duty Amazon FBA profit Browse all 31 →
Dimensional weight Billable weight in pounds using each carrier's current divisor, side by side. Volumetric weight Metric volumetric weight with the divisor your carrier actually uses. Chargeable weight The greater of actual and volumetric, with the carrier's rounding applied. Girth Girth, length + girth, and a pass/fail against carrier size limits. CBM Cubic metres, cubic feet, and CBM converted to chargeable weight by mode. Pallet loading Cartons per layer and per pallet, packed the way a warehouse would. Container load Cartons or pallets per container, and what limits the load. Freight class Density in lb/ft³ mapped to an NMFC class, on the current scale.

Shipping

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Rates, chargeable weight and delivery dates for DHL, FedEx, UPS, USPS and the regional couriers.

Dimensional weight updated Billable weight in pounds using each carrier's current divisor, side by side. Volumetric weight Metric volumetric weight with the divisor your carrier actually uses. Chargeable weight The greater of actual and volumetric, with the carrier's rounding applied. Girth Girth, length + girth, and a pass/fail against carrier size limits. Size limits Pass, surcharge or refuse, across every carrier at once. Divisor table Every carrier's divisor, dated and sourced, in one table. Shipping cost A full quote breakdown from weight through surcharges to duty. Compare carriers One parcel, every carrier's billing rules, side by side. Delivery date An arrival date that accounts for cut-offs, holidays and customs. Transit time Working days between two dates, holidays excluded.

Customs & duty

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Import duty, VAT and GST, de minimis thresholds and full landed cost, broken down line by line.

Customs duty updated Duty, VAT and levies, stacked in the order customs actually applies them. Landed cost Goods, freight, duty, tax and fees, resolved to a cost per unit. De minimis Duty-free and tax-free import limits, market by market. DDP vs DAP The cost split between you and your buyer under each Incoterm.

Freight

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CBM, chargeable weight by mode, pallet and container loading, and US LTL freight class.

CBM Cubic metres, cubic feet, and CBM converted to chargeable weight by mode. Pallet loading Cartons per layer and per pallet, packed the way a warehouse would. Container load Cartons or pallets per container, and what limits the load. Freight class Density in lb/ft³ mapped to an NMFC class, on the current scale.

Seller profit

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Amazon, Etsy, eBay, Shopify and TikTok Shop fees, margins, break-even prices and ad thresholds.

Amazon FBA updated FBA fees on the 2026 structure, with break-even and max ad spend. FBA + duty updated The full import-to-payout chain in one calculation. eBay fees updated 2026 final value fees on the correct base, plus true net profit. Etsy fees Every Etsy fee including the regulatory fee and VAT on fees. TikTok Shop Referral, affiliate commission and VAT, per market. Compare marketplaces One product, every marketplace, same inputs, ranked by net profit. FBA storage Monthly storage, Q4 rates and the aged inventory surcharge. Profit margin Margin, markup and ROI after the costs that actually apply. Break-even price The floor price, and the price for the margin you actually want. Break-even ACOS The ACOS, ROAS and CPC ceilings your unit economics allow. LTV : CAC Lifetime value on gross profit, and the CAC it can support. Reorder point When to reorder, with safety stock sized on real variability. EOQ The order size where ordering and holding costs balance.

Why these are different

We built these after auditing the calculators that currently rank for these searches. Several are broken, several are years out of date, and almost none tell you where their numbers came from.

Every number shows its working

Open the audit trail under any result and you get the formula, the inputs and the source behind each step. Nothing else in this category will tell you why it gave you a number.

Dated, cited rate data

Fee tables carry an effective date, a source link and a confidence level. The deepest eBay calculator online still runs on fees from November 2022, and the biggest tool farm in the niche publishes no dates at all.

The 2026 changes are in

The USPS divisor moved from 166 to 139 in July. Amazon split fulfilment into three price bands in January and added a 3.5% surcharge in April. The US $800 de minimis exemption is gone. Most calculators have absorbed none of it.

Shipping and selling in one place

Landed cost flows into marketplace fees flows into net margin. Duty is now often a bigger line item than the referral fee, and no seller calculator we could find models it at all.

Shareable, exportable, printable

Your inputs live in the URL, so a link reopens the exact scenario. Send it to a supplier, paste it into a support ticket, print it as a PDF quote.

No login, no ads, no rate limit

Amazon's own FBA calculator sits behind a login. Several shipping calculators that rank on page one return no rate at all. These run in your browser and always return an answer.

What changed recently

Rule changes that made most existing calculators wrong. Each one is implemented here.

  • USPS dimensional divisor moved from 166 to 139, with fractional inches rounding up, on parcels over one cubic foot.
  • US de minimis suspension made indefinite by regulation. Statutory repeal follows on 1 July 2027.
  • Amazon added a 3.5% fuel and logistics surcharge on every FBA fee in the US and Canada.
  • Amazon's Digital Services Fee rose to 3% and expanded to the UK, France, Spain and Italy.
  • Amazon FBA fulfilment split into three price bands: under $10, $10 to $50, and over $50.
See every source and its confidence level →

Looking for something else?

These tools are deliberately narrow — shipping, customs and ecommerce economics, done properly. For everyday conversions, finance and general maths, our sister site ToolsBay keeps a much broader library. More about who we work with.