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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.

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Fifteen tools across finance, logistics, listings, and compliance
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Formula-driven—no AI usage fees
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Built from real operator workflows
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No credit card · no ads

🗂️ All 19 tools

Margins, FBA tiers, dimensional weight, duty estimates, inventory turns, and more—plain formulas, no AI calls, free to use.

Profit calculator
Finance

See if your price leaves healthy margin before launch.

In
Price, COGS, shipping, ads, marketplace fee
Out
Profit dollars, margin %, risk callouts
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Breakeven calculator
Finance

How many units you must sell to cover costs.

In
Fixed costs, price, variable cost per unit
Out
Breakeven units and revenue
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ACoS / ROAS calculator
Finance

Check whether ad spend is paying back.

In
Ad spend, attributed sales
Out
ACoS %, ROAS, bid sanity check
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Marketplace fee compare
Finance

Same item, different venues—see net after fees.

In
Price, category
Out
Net profit table for Amazon / Walmart / Newegg / eBay
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FX profit impact
Finance

If FX moves 1%, what happens to margin?

In
USD price, CNY costs, spot FX, shock %
Out
Profit change, margin points
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Return-cost impact
Finance

If return rate rises 1%, how much margin you lose.

In
Return rate, AOV, handling cost per return
Out
Annual dollar bleed, margin impact
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Exchange rate calculator
Finance

Convert between currencies with live rates.

In
Amount, source currency, target currency
Out
Converted amount
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Dimensional weight
Logistics

Billable weight vs actual—avoid freight surprises.

In
L/W/H (cm), actual weight (kg)
Out
DIM weight, billable weight, carrier compare
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Amazon FBA size tier
Logistics

Know the fee tier before you ship FBA.

In
Dimensions and weight
Out
Standard / Large Bulky / Extra-Large plus fee hints
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Restock planner
Logistics

Back out last order date without stockouts or bloat.

In
Daily sales, on-hand, production lead, ocean days, safety stock days
Out
Last order-by date, projected stockout
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Listing character checker
Listing

Title and bullet length vs marketplace caps.

In
Title, bullets, body copy
Out
Counts vs limits with highlights
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Keyword density
Listing

See if important terms show up where they should.

In
Full listing copy
Out
Top ten terms, counts, density %
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Readability score
Listing

Is the description easy to scan and on-policy?

In
Full product description
Out
Words, avg sentence length, Flesch score, tips
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VAT quick lookup
Compliance

Headline VAT rates for EU, UK, AU-style markets.

In
Destination country
Out
Standard / reduced rates, registration hints
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HS duty estimate
Compliance

Rough duty before goods hit the US or EU.

In
First six HS digits, origin, declared value
Out
Duty band, estimated duty dollars
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Inventory turnover
Operations

See if cash is stuck on the shelf.

In
Monthly sales, units on hand, unit cost
Out
Days on hand, cash tied up, simple benchmark
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Remove duplicate text
Text Tools

Deduplicate lines and copy the clean result.

In
Multi-line text
Out
Deduplicated lines
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Text case converter
Text Tools

Switch between upper, lower, and title case.

In
Text string
Out
Converted text with word/char stats
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Word frequency counter
Text Tools

Rank terms by frequency; export to CSV.

In
Text, optional stop-word list
Out
Top terms, counts, density %
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