Fifteen free calculators
built for cross-border sellers
Margins, FBA tiers, dimensional weight, duty estimates, inventory turns, and more—plain formulas, no AI calls, free to use.
Fifteen tools across finance, logistics, listings, and compliance
Formula-driven—no AI usage fees
Built from real operator workflows
No credit card · no ads
🗂️ All 15 tools
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💰Finance
Profit calculator
See if your price leaves healthy margin before launch.
InPrice, COGS, shipping, ads, marketplace fee
OutProfit dollars, margin %, risk callouts
📊Finance
Breakeven calculator
How many units you must sell to cover costs.
InFixed costs, price, variable cost per unit
OutBreakeven units and revenue
📣Finance
ACoS / ROAS calculator
Check whether ad spend is paying back.
InAd spend, attributed sales
OutACoS %, ROAS, bid sanity check
🏪Finance
Marketplace fee compare
Same item, different venues—see net after fees.
InPrice, category
OutNet profit table for Amazon / Walmart / Newegg / eBay
💱Finance
FX profit impact
If FX moves 1%, what happens to margin?
InUSD price, CNY costs, spot FX, shock %
OutProfit change, margin points
↩️Finance
Return-cost impact
If return rate rises 1%, how much margin you lose.
InReturn rate, AOV, handling cost per return
OutAnnual dollar bleed, margin impact
📦Logistics
Dimensional weight
Billable weight vs actual—avoid freight surprises.
InL/W/H (cm), actual weight (kg)
OutDIM weight, billable weight, carrier compare
🏷️Logistics
Amazon FBA size tier
Know the fee tier before you ship FBA.
InDimensions and weight
OutStandard / Large Bulky / Extra-Large plus fee hints
📅Logistics
Restock planner
Back out last order date without stockouts or bloat.
InDaily sales, on-hand, production lead, ocean days, safety stock days
OutLast order-by date, projected stockout
📝Listing
Listing character checker
Title and bullet length vs marketplace caps.
InTitle, bullets, body copy
OutCounts vs limits with highlights
🔍Listing
Keyword density
See if important terms show up where they should.
InFull listing copy
OutTop ten terms, counts, density %
📖Listing
Readability score
Is the description easy to scan and on-policy?
InFull product description
OutWords, avg sentence length, Flesch score, tips
🇪🇺Compliance
VAT quick lookup
Headline VAT rates for EU, UK, AU-style markets.
InDestination country
OutStandard / reduced rates, registration hints
🛃Compliance
HS duty estimate
Rough duty before goods hit the US or EU.
InFirst six HS digits, origin, declared value
OutDuty band, estimated duty dollars
🔄Operations
Inventory turnover
See if cash is stuck on the shelf.
InMonthly sales, units on hand, unit cost
OutDays on hand, cash tied up, simple benchmark
💬
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