SSolarc Labs

Amazon seller toolkit · 12 free tools · no signup

Free Amazon seller tools for the decisions that move cash.

Calculate FBA profit, check UK price cliffs, break-even ACoS, TACoS, return cost, FBA vs FBM economics, reorder points and carrying cost—then compare two settlement files or audit SKU-level contribution when estimates are no longer enough.

Calculate FBA profit Check a price cliffCompare settlementsAudit a SKU CSVBrowse all 12 tools
12 focused Amazon routesProfit + price cliffs + PPC + inventory + settlement deltasNo signupYour inputs and files, not fake live dataIndependent — not Amazon-affiliated

Start from the money question

Four seller jobs. One direct path to the right tool.

Profit & unit economics

Know what each sale actually leaves behind.

Jump to 5 tools

Advertising efficiency

Set the ad-spend ceiling before PPC erases margin.

Jump to 2 tools

Inventory & cash

Reorder because the economics support it—not because stock is running low.

Jump to 3 tools

Settlement & SKU audits

Move from estimated unit economics to the files that show what changed.

Jump to 2 tools

Profit & unit economics

Know what each sale actually leaves behind.

Start with contribution profit, then check fee thresholds, return, fulfilment and hidden inventory costs before scaling or repricing a SKU.

FBA profit

Amazon FBA Profit Calculator

Model price, COGS, fulfilment, referral fees, ads, returns and other variable costs using your own inputs.

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Price cliffs

Amazon Price Cliff Detector

Check nearby UK referral-fee and Low-Price FBA thresholds before a small repricing move reduces contribution.

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True profit

Amazon True Profit Calculator

Add inbound costs, storage, aged inventory, advertising, discounts, returns and unrecoverable stock to a deeper contribution model.

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Returns

Amazon Return Cost Calculator

Translate return rate into expected processing, shipping, refund-admin and unrecoverable-inventory cost.

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FBA vs FBM

Amazon FBA vs FBM Calculator

Compare contribution profit with your own FBA, carrier, pick-pack, packaging, storage and return assumptions.

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Advertising efficiency

Set the ad-spend ceiling before PPC erases margin.

Use break-even ACoS for unit economics and TACoS for the wider relationship between ad spend and total sales.

Break-even ACoS

Amazon Break-even ACoS Calculator

Estimate the advertising-cost ceiling before a unit reaches zero contribution profit.

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TACoS

Amazon TACoS Calculator

Compare total ad spend with total revenue and track the ratio without confusing it with campaign-only ACoS.

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Inventory & cash

Reorder because the economics support it—not because stock is running low.

Connect sales velocity, lead time, safety stock, carrying cost and available cash before committing to the next purchase order.

Reorder point

Amazon Reorder Point Calculator

Turn daily sales, lead time and safety-stock days into a practical reorder threshold.

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Reorder cashflow

Amazon Cashflow Reorder Calculator

Check whether cash left after fees, ads, refunds, COGS and operating costs can fund the next inventory order.

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Inventory cost

Amazon Inventory Carrying Cost Calculator

Estimate storage, aged-inventory and capital carrying cost before slow stock silently destroys margin.

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Settlement & SKU audits

Move from estimated unit economics to the files that show what changed.

Compare two Amazon settlement periods, then drill into normalized SKU economics when you need COGS, PPC and returns in the same view.

Settlement delta

Amazon Settlement Delta Auditor

Compare two Flat File V2 settlements locally and surface the biggest fee, refund, reserve, amount-description and SKU row-net movements.

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Multi-SKU audit

Amazon SKU Profit CSV Auditor

Upload a normalized CSV, map revenue, fees, PPC, returns and COGS, then rank SKUs by estimated contribution.

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Free → repeated workflow

Keep the arithmetic free. Pay only when the work repeats.

A one-off profit check, price-threshold check or settlement comparison should not require a subscription. The paid boundary starts when you need retained mappings, joined exports, period history, saved models, recurring checks, monitoring, team history, alerts or managed implementation.

Need automation?

See the current paid products only when manual work becomes repetitive.

See pricing Compare Shopify & WooCommerce tools

Amazon seller tools FAQ

What these tools do—and what they do not claim.

Are these Amazon seller tools free?

Yes. The tools on this page are available without signup. Use them for one-off calculations and diagnosis before deciding whether a repeated workflow needs paid automation.

Do the calculators use live Amazon Seller Central data?

No. They use the numbers you enter or, where stated, files you provide. The Price Cliff Detector uses a bounded UK fee-threshold model with seller-entered fulfilment fees; the Settlement Delta Auditor reads two Flat File V2 exports locally in your browser. Neither connects to your Seller Central account.

Which Amazon tool should I start with?

Start with FBA Profit for one SKU. Use Price Cliff before a small UK repricing move, Break-even ACoS when advertising is the decision, Reorder Point and Cashflow Reorder for inventory, Settlement Delta when a payout period changed, and the SKU Profit CSV Auditor when you need COGS-aware multi-SKU contribution.

Is Solarc Labs affiliated with Amazon?

No. Solarc Labs is independent and is not endorsed by or affiliated with Amazon. Amazon and FBA are trademarks of their respective owner.

Solarc Labs is independent and is not endorsed by or affiliated with Amazon. Amazon and FBA are trademarks of their respective owner.