Seller toolkit

Stop pricing, bidding and reordering from a guess.

Practical offline calculators for online sellers. Buy once, keep the file, and run the numbers without an account or subscription.

Get the four-tool bundle — $39 Download the free 7-formula cheat sheet

Importing

LandedCost

$15

Calculate true landed cost with freight, insurance, duty, tax and supplier comparison.

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Inventory

StockPilot

$15

Turn sales velocity, supplier lead time and safety stock into reorder dates and quantities.

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Advertising

AdMath

$12

Find the ACOS your margin can afford, the maximum CPC, and term-level bid actions.

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Profit

ShopFee

$12

Break down platform and payment fees to see net profit, margin, ROI and break-even price.

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Research

PriceTrack

Check Amazon price history and set optional price-drop alerts from one browser extension.

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These tools are calculation and writing aids, not accounting, tax, customs, legal or financial advice. Confirm platform fees, duty rates and listing rules against the current official source before acting.