Calculate exact SKU Reorder Points (ROP), Z-score Safety Stock, and PO reorder dates across supplier lead-time variance in 100% local browser RAM.
Statistical Safety Stock, Reorder Point (ROP) & Days-Until-PO Alert Schedule
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Supports CSV, JSON, TXT, XML & Log Streams
=SUMIFS(reorder_gross, SKU, A2) - VLOOKUP(A2, reorder_fees!A:D, 4, FALSE)⚠️ Why Manual Formulas Fail at Scale: Manual spreadsheet formulas break on multi-row reorder point adjustments, tiered fees, and CSV delimiter shifts.
🛡️ Zero-Upload Local Studio Advantage: Run Reorder Point calculations and CSV checks 100% locally in your browser.
Core capabilities built into ReorderStock Studio Local Engine
Accounts for both daily sales volatility and overseas factory/customs lead-time slippage using the full APICS/King statistical formula.
Assign 99% in-stock service levels (Z = 2.33) to hero A-SKUs while keeping C-SKUs lean at 90% (Z = 1.28) to free up trapped cash.
Automatically translates SKU reorder triggers into recommended 30/60-day Purchase Order quantities and exact FOB dollar outlays.
Run your entire inventory replenishment audit 100% locally in browser memory without paying $119+/mo or exposing supplier lead times.
Zero configuration, zero cloud server dependencies, instant execution.
Drop your Shopify or Amazon FBA inventory CSV with daily unit velocity, lead-time days, and current stock.
Slide the service level control from 85% to 99% to see safety stock, Reorder Point (ROP), and days-until-PO update in 50ms.
Download your prioritized PO restock schedule and working capital forecast for immediate supplier ordering.
See why merchants and prosumers switch from monthly subscriptions to our local buyout.
| Feature / Metric | 🛡️ ReorderStock Studio | ☁️ Cloud SaaS (InventoryPlanner) |
|---|---|---|
| Pricing Model 💳 | 🛡️ $19 One-Time Lifetime Buyout (€3.99 Pass) | ☁️ $119–$249/mo Recurring ERP Subscription |
| Supplier & Velocity Privacy 🔒 | 🛡️ 100% Local Browser RAM (Zero Store Sync) | ☁️ Requires Full Store & Supplier PO Cloud Sync |
| Lead-Time Variance Modeling 📊 | 🛡️ Full Dual-Variance Z-Score King Formula | ☁️ Often Static Days-of-Stock Averages |
| Multi-SKU Batch Speed ⚡ | 🛡️ 50ms Instant In-Browser Matrix | ☁️ Overnight Cloud Sync & Onboarding Delays |
Eliminate vendor lock-in and cloud upload security risks.
Growing Shopify and FBA brands shouldn't pay $119–$249 every month just to calculate when to wire their next factory PO.
Basic calculators only multiply average sales by average lead time, leaving zero statistical buffer when ocean freight slips by 10 days.
Cloud forecasting tools force you to upload confidential supplier unit costs, factory lead times, and SKU sales velocities.
Deep technical breakdown driving our client-side productivity engine.
Processes ReorderStock Studio Local Engine structures directly inside isolated browser memory.
Ensures zero ReorderStock Studio Local Engine bytes touch external API servers or third-party storage.
Parses high-throughput ReorderStock Studio Local Engine records in real-time with sub-50ms response times.
Complete commercial data sovereignty with standalone offline capability.
No monthly bills. No sneaky price hikes. Pay once, use forever.
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Everything you need to know about privacy, local memory execution, and buyouts.
Reorder Point (ROP) equals (Average Daily Unit Sales × Average Lead Time in Days) + Statistical Safety Stock. When your available inventory (On-Hand + On-Order) drops to the ROP, you must place a new Purchase Order immediately.
Using King's statistical equation: Safety Stock = Z × sqrt((Average Lead Time × Demand Standard Deviation²) + (Average Daily Sales × Lead-Time Standard Deviation)²), where Z is your service-level factor (1.65 for 95%, 2.33 for 99%).
Most sellers apply a 98%–99% service level (Z = 2.05 to 2.33) to their top 20% hero SKUs where stockouts destroy organic ranking, and a 90%–95% service level (Z = 1.28 to 1.65) to slower-moving catalog SKUs.
Yes. Total replenishment lead time must include factory production days + ocean/air transit + customs clearance + Amazon FC check-in and receiving transfer days (typically 10–18 extra days).
Never. All CSV parsing, Z-score safety stock calculations, and PO working capital projections execute 100% locally in your browser RAM.
While Inventory Planner ($119+/mo) and Prediko charge recurring monthly fees tied to your store revenue, ReorderStock Studio is a one-time $19 lifetime buyout for instant, zero-login multi-SKU reorder point and safety stock modeling.