Amazon seller guides

Track Stock Like a Pro With an Amazon Inventory Spreadsheet

An Amazon inventory spreadsheet is the difference between reordering with confidence and guessing. This guide shows you exactly which columns to track, the reorder-point math that prevents stockouts, and how to turn your sheet into an Amazon inventory file Seller Central accepts — using our free inventory file generator .

Table of contents
  1. What your spreadsheet needs
  2. From spreadsheet to Seller Central
  3. Reorder point math: a worked example
  4. Validating your file before upload
  5. Common spreadsheet mistakes
  6. Inventory spreadsheet FAQ

What your Amazon inventory spreadsheet needs

An Amazon inventory spreadsheet is the control tower for your stock: one place that answers "how much do I have, how fast is it selling, and when do I reorder?" Before touching any template, make sure yours tracks these columns:

  • SKU / ASIN — your internal SKU plus the Amazon ASIN, so the sheet maps to Seller Central.
  • Current FBA quantity — units available at Amazon fulfillment centers right now.
  • Inbound / in-transit units — stock shipped but not yet received, so you don't double-order.
  • Average daily sales — computed over the last 30 days for a stable velocity.
  • Lead time (days) — how long a restock takes from order to available at FBA.
  • Reorder point — the stock level that triggers a new purchase order.
  • Days of cover — current stock divided by daily sales; your early-warning number.

Days of cover is the column most sellers skip and the one that prevents stockouts. If you have 300 units selling 10 a day, you have 30 days of cover — comfortable. At 12 days with a 20-day lead time, you are already late.

Amazon inventory spreadsheet SKU-101 · Widget Pro 210 units · 21 days cover SKU-102 · Gadget Mini 32 units · 4 days cover — REORDER Reorder point = daily sales × lead time + safety stock
A working inventory spreadsheet flags SKU-102 for reorder while SKU-101 is comfortable.

Key takeaway: Track SKU, FBA quantity, inbound units, daily sales, lead time, reorder point and days of cover. Days of cover under your lead time means order now.

Spreadsheet to Seller Central workflow 1 Build the sheet SKU, qty, dates 2 Validate the file Checklist pass 3 Upload in SC Inventory loader 4 Confirm Watch for errors
A calm four-step path from spreadsheet rows to live inventory — validation is the step most sellers skip.

From spreadsheet to Seller Central: the inventory file

Your spreadsheet is for decisions ; the Amazon inventory file is for action — it is the upload file Seller Central accepts to add or update listings in bulk. The workflow looks like this:

  1. Maintain quantities and reorder logic in your Amazon inventory spreadsheet .
  2. When it is time to act, generate an inventory file from the same data with our free inventory file generator — it builds a Seller Central-compatible draft from your rows.
  3. Compare the draft against Seller Central's current template (Amazon updates templates periodically) and upload.

Important honesty note: treat any generated file as a draft . Always compare it with the latest template in Seller Central before uploading — a stale column header is the number one cause of failed uploads.

Reorder point math: a worked example

The reorder point tells your spreadsheet exactly when to raise the flag:

Reorder point = (Daily sales × Lead time) + Safety stock

Worked example

You sell 12 units/day , restocking takes 25 days , and you keep 7 days of safety stock.

Reorder point = (12 × 25) + (12 × 7) = 300 + 84 = 384 units

When available + inbound stock drops to 384 units, place the next order. Our inventory reorder calculator runs this for your whole catalog at once.

Reorder point: 384 Lead time: 25 days Stock arrives Inventory level over time Days →
Order at the reorder point and stock lands just as you approach empty — not before (cash tied up) or after (stockout).
Pre-upload validation checklist Green = done Orange = improve Red = fix now SKUs match Seller Central exactly Exact match Quantities are numbers, not text Format check ! Dates in YYYY-MM-DD Fix flagged rows No duplicate SKU rows Dedupe first File under the row limit OK
Five checks that catch the upload errors Seller Central reports most cryptically.

Validating your file before upload

Most upload failures come from the same handful of issues: missing required columns, wrong date formats, invalid SKU characters, or values that changed since the template was downloaded. Before every upload:

  • Run the file through our free inventory flat-file validator to catch formatting errors locally.
  • Confirm required columns exist for your upload type (new listings need far more than quantity updates).
  • Upload a small test batch first — five SKUs, not five thousand.

A two-minute validation pass saves the classic failure loop: upload, wait for Amazon's processing report, fix one error, re-upload, repeat.

When spreadsheets work — and when they break Do this: Spreadsheet wins when SKU count is small Someone reviews weekly One owner, clear rules Not this: It breaks when Hundreds of SKUs Nobody updates it Many editors, no rules
Spreadsheets fail from neglect, not from formulas — match the tool to the catalog size.

Common inventory spreadsheet mistakes

  1. Ignoring inbound stock. Counting only FBA-available units makes you reorder stock that is already on a truck.
  2. Using lifetime average velocity. A product that sold 2/day last year and 20/day now needs the recent number. Use trailing 30 days.
  3. No safety stock. Lead times slip — suppliers delay, Amazon receiving slows in Q4. Seven to fourteen days of buffer is cheap insurance.
  4. Forgetting storage fees. Over-ordering "just in case" racks up monthly FBA storage fees. Check profitability impact with an FBA fee calculator before upsizing a purchase order.
  5. One spreadsheet, zero backups. Keep version history — a corrupted file with no backup has ended more than one seller's Q4.

Turn your spreadsheet into an upload-ready file

Generate a Seller Central-compatible Amazon inventory file from your data — free, in your browser, nothing uploaded.

Build my inventory file

Inventory spreadsheet FAQ

At minimum: SKU/ASIN, current FBA quantity, inbound units, average daily sales (trailing 30 days), supplier lead time in days, reorder point, and days of cover. Days of cover — stock divided by daily sales — is your early-warning metric for stockouts.

Reorder point = (average daily sales x supplier lead time in days) + safety stock. Example: 12 units/day x 25-day lead time + 84 units of safety stock = a 384-unit reorder point. Our free inventory reorder calculator computes this for every SKU at once.

The Amazon inventory file (inventory loader flat file) is the spreadsheet-format upload Seller Central accepts for bulk listing changes — adding products, updating quantities and prices. It is separate from your tracking spreadsheet: the spreadsheet decides what to do, the file executes it.

Validate locally before uploading: check required columns, date formats and SKU characters with a flat-file validator, confirm you are using Seller Central's current template version, and test with a small batch of SKUs first.

Most sellers keep 7-14 days of safety stock, more in Q4 when Amazon receiving slows and demand spikes. Balance it against storage fees — excess buffer stock earns monthly FBA storage charges, so size safety stock deliberately, not fearfully.

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