Inventory is the case where the collaboration difference stops being a preference and starts deciding whether your numbers are right.
Two people receiving stock at the same time is not an edge case, it is Tuesday. In Excel that means either a shared workbook with its well-known merge failures, or a convention that one person owns the file — which in practice means movements are recorded on paper and typed up later, which is where the errors come from.
Google Sheets handles it natively. Ten people can append movement rows simultaneously and the balance recalculates for everyone. For anything with more than one person touching stock during the day, this settles it.
| Requirement | Excel | Google Sheets |
|---|---|---|
| Concurrent entry | Poor; co-authoring conflicts | Native, reliable |
| Mobile entry | Limited mobile app | Full mobile editing; Forms for structured entry |
| Scale (SKUs) | 1M rows; comfortable to ~50k SKUs with Power Query | 10M cells; comfortable to ~5k SKUs |
| Reorder alerts | Conditional formatting; email needs VBA | Apps Script trigger emails automatically |
| Barcode input | Scanner as keyboard into validated cell | Same, plus mobile camera via Forms |
| Supplier lookups | XLOOKUP over a supplier table | VLOOKUP / QUERY |
| ABC / valuation analysis | Power Pivot, strong | QUERY, adequate |
| Offline warehouse | Works | Needs connectivity |
The mistake that causes most inventory spreadsheet failures is storing the current quantity as a typed number. Someone overtypes it during a count, and from that moment the file cannot be reconciled against reality.
Record events instead. One row per receipt, issue or adjustment, each with a date, SKU, quantity and reason. Current stock is then a calculation, and it is always reconstructable:
=SUMIFS(Movements[Qty], Movements[SKU], [@SKU])Reorder status becomes a comparison against a per-SKU threshold rather than a manual flag:
=IF([@OnHand] <= [@ReorderPoint], "REORDER", "OK")And the reorder point itself should be derived, not guessed — average daily usage times lead time, plus a safety buffer:
=ROUNDUP(AVERAGE(DailyUsage) * LeadTimeDays * 1.2, 0)Our inventory management template and warehouse stock template are both built this way.
Any two of these together mean the spreadsheet is now the bottleneck:
The usual outcome is not that the spreadsheet disappears; it is that it stops being the system of record and becomes the reporting layer over one.
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Scale, concurrency and structure
Up to roughly 5,000 SKUs with a handful of movements each per month, either platform is comfortable. Between 5,000 and 50,000 Excel with Power Query and a data model is the practical choice. Past that, or with barcode scanning and multi-location transfers, you want inventory software with a spreadsheet reporting layer on top.
In the sense that matters, yes: several people can record movements simultaneously and everyone sees the result immediately, and Apps Script can accept submissions from a form or a scanner app. What it cannot do is guarantee ordering under heavy concurrent writes without <code>LockService</code>.
Storing the current stock level as a typed number rather than deriving it from movements. Once someone overtypes a computed figure the audit trail is gone and reconciliation becomes guesswork. Record receipts and issues; calculate the balance.
Below a few hundred movements a week, manual entry with validation is fine. Above that, transcription errors dominate. A cheap USB scanner behaves as a keyboard and works straight into a validated cell in either platform.
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