Seller Toolkit

Paste a product title to count its characters against the 200 limit and see how many of your target keywords actually made it in.

Paste your listing text and one keyword to see how many times it appears and what share of the copy it makes up.

Paste up to five bullet points (one per line); the tool trims whitespace, capitalizes the first letter, and returns clean copy you can paste back.

Convert a messy product title to clean Title Case, keeping small connector words lowercase unless they sit first or last.

Paste keywords (one per line); the tool removes duplicates and stopwords, then reports the UTF-8 byte count against Amazon's 250-byte limit.

Pick a listing field, paste your text, and see the character (or byte) count against Amazon's per-field limit.

Enter your 1–2 star review count and the complaint themes you noticed (with rough mention counts) to estimate the top complaint's share and what to fix.

Score a listing 0–100 from A+ content, image count, title length, bullet count, and backend search terms, with a points breakdown.

Divide your ad spend by the sales those ads produced to get ACOS, then compare it to your profit margin to see if the campaign is actually profitable.

Turn ad spend and ad-attributed revenue into a ROAS multiple (like 4.2x), then see why 1x means you merely got your money back, not profit.

Your break-even ACOS is your pre-ad profit margin; bid past it and you lose money on every ad-attributed sale. See the ceiling at common margins.

Find the highest bid you can safely place from your target ACOS, conversion rate, and average order value — and why bidding over it breaks your ACOS goal.

Split a monthly ad budget into a daily spend, then estimate clicks per day and sales per day from your CPC and conversion rate.

Turn impressions and CTR into clicks, or reverse it: give the clicks and impressions and derive your real CTR. Typical sponsored CTR is about 0.4%.

Find how many units should remain when you place the next purchase order: average daily sales times lead time, plus safety stock.

Size your stockout buffer from your worst demand swing and lead time, scaled by a service-level factor (90 / 95 / 99%).

Measure how many times a year your stock sells and replaces: annual COGS divided by average inventory value, plus days of inventory.

Estimate Amazon's monthly LTS fee on aged inventory: the greater of the per-unit or per-cubic-foot charge, by age bracket.

Split a batch into cases and shipments: cases from case pack, shipments from your per-shipment cap, and units in the last partial box.

Add supplier, transit, and port buffers into a true lead time, then work out the unit coverage you need to avoid a stockout.

Compare your days of cover against the days until your next shipment arrives, and show exactly when and how bad a stockout hits.

Find the order size that minimizes combined ordering and holding cost: EOQ = √(2 × annual demand × order cost ÷ holding cost).

Turn a Best Seller Rank into a rough daily and monthly sales figure using a per-category multiplier and a square-root decay model.

Read how hard a niche is to break into from the review counts of the top 10 and your own review count — easy, medium, or hard.

Roll estimated demand, competition, and your margin into one 0–100 score so you can rank product ideas without guessing.

Project your review pace and how many months until you hit 100 or 500 reviews from your current count and last-30-day gains.

Score a keyword by search volume, your conversion rate, and how weak the current top result is (via its BSR) — demand times conversion divided by difficulty.

Show how much hotter your Q4 months run than a normal month from your Q4 share of annual sales and your current monthly volume.

Measure your ODR against Amazon's 1% account-health limit using negative feedback, A-to-z claims, and chargebacks over the trailing 60 days.

Check your late shipment rate against Amazon's 4% threshold using orders confirmed after the expected ship date.

Compute your seller-cancelled rate against the 2.5% limit; buyer-initiated cancels don't count.

Check your valid tracking rate against Amazon's 95% floor (aim 98%+) using shipments with confirmable tracking.

Compute your return rate from units ordered and units returned, with category context for what counts as normal.

Run a quick yes/no compliance pass across five common Amazon policy areas and see which ones you're failing.

Convert an amount between major selling currencies using fixed illustrative rates, so you can sanity-check a price or a cost before you move real money.

Work out the VAT on a net price and the gross a customer pays, using the standard EU/UK rates or any custom rate you type.

Estimate the import duty on a shipment from its customs value, freight, and duty rate — duty is charged on value plus freight, not on the product price alone.

Compare annual fees of Amazon's Pan-EU (distributed stock, no cross-border fee) against EFN (single country, per-order cross-border fee) at your sales volume.

Build the true per-unit landed cost for an imported product: factory cost, freight, duty, VAT on the dutied value, and last-mile delivery.

Build a clean, consistent SKU from a brand prefix, product code, and variant, joined by the separator you choose.

Compute the GS1 mod-10 check digit for an 11-digit UPC body or 12-digit EAN body, and return the full 12/13-digit code.

Validate an Amazon FNSKU: confirm it is exactly 10 characters and uses only letters and numbers, before you print the label.

From units in stock, daily sales, today's date, and lead time, work out days of cover, the stockout date, and the date to reorder.