Drop your Amazon Seller Central settlement CSV or SKU catalog to calculate 2026 referral fees, FBA fulfillment brackets, inbound placement charges, return deductions, and break-even ACOS/ROAS 100% locally in your browser—zero SP-API OAuth required.
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Supports CSV, TSV, TXT, JSON
=SalePrice - COGS - FBAFee - MAX(0.30, SalePrice*RefPct) - InboundPlacement - (SalePrice*TACOS) - (SalePrice*ReturnRate*0.35)⚠️ Why Manual Formulas Fail at Scale: Manual Excel VLOOKUP/SUMIFS formulas across Seller Central settlement CSVs break when multi-SKU orders, promotional rebates,
🛡️ Zero-Upload Local Studio Advantage: Drop your Seller Central CSV into the local browser studio to reconcile ASIN-level net profit, fee load %, and break-even ROA
Core capabilities built into Fbaskustudio
Automatically computes standard vs. oversize dimensional weight brackets, 8%–15% category referral fees, $0.30 minimum referral thresholds, and Low-Price FBA rate cards.
Quantifies the exact per-unit margin impact of Amazon minimal shipment splits ($0.21–$0.68/unit) and historical days-of-supply surcharges before you create an FBA shipping plan.
Factors in non-sellable customer returns, FBA return processing fees, and PPC ad spend to show the exact break-even ROAS and true net contribution margin for every ASIN.
Never upload your proprietary supplier invoices, wholesale COGS, or top-selling ASIN list to a third-party cloud server. All CSV rows are processed locally in your browser.
Zero configuration, zero cloud server dependencies, instant execution.
Load your Amazon FBA Fee Preview report, Date Range Settlement CSV, or custom ASIN cost sheet directly into local browser memory.
Use the interactive sliders to simulate PPC ad spend %, inbound placement surcharges, and category return rates across your entire SKU catalog.
Inspect the 70% free SKU profitability breakdown and waterfall chart immediately, or unlock 100% batch CSV export and the standalone offline PRO app for $19.
See why merchants and prosumers switch from monthly subscriptions to our local buyout.
| Feature / Metric | 🛡️ Fbaskustudio | ☁️ Cloud SaaS (Sellerboard) |
|---|---|---|
| Pricing & Licensing Model | 🛡️ $19 One-Time Lifetime Buyout (€3.99 24h Pass) | ☁️ $39–$99/mo Recurring Subscription ($468+/yr) |
| Supplier COGS & ASIN Data Privacy | 🛡️ 100% Local Browser RAM (Zero SP-API Cloud Sync) | ☁️ Requires Full Seller Central OAuth & Cloud Storage |
| 2026 Inbound Placement & Return Surcharges | 🛡️ Instant Interactive Per-Unit Slider Simulation | ☁️ Delayed Post-Settlement Batch Sync |
| Execution Speed on 10,000+ Settlement Rows | 🛡️ Sub-50ms Client-Side Engine (Zero Login) | ☁️ Multi-Minute Cloud Dashboard Refresh |
Eliminate vendor lock-in and cloud upload security risks.
Most Amazon sellers only need to audit SKU unit economics, FBA fee tiers, and break-even ACOS/ROAS—not another $39–$99/month recurring SaaS bill.
Connecting third-party profit apps via SP-API exposes your exact supplier costs, order volumes, and winning SKUs to external cloud databases.
Spreadsheets miss the compound impact of inbound placement fees, refund administration charges, and return processing deductions that silently turn 25% gross margin into net losses.
Deep technical breakdown driving our client-side productivity engine.
Amazon bills FBA fulfillment on the greater of actual weight or dimensional weight ((L x W x H) / 139). Reducing packaging by 0.4 inches can drop a SKU an entire fee tier.
When an FBA customer returns an item, Amazon retains a 20% refund administration fee (up to $5.00) plus non-refundable fulfillment costs—creating a 35%+ margin drag on high-return SKUs.
Compare Amazon's minimal shipment split fee ($0.21–$0.68/unit) against carrier LTL freight costs locally before locking in your Send-to-Amazon workflow.
Calculates `Break-Even ROAS = Sale Price / Pre-Ad Net Contribution` so your Sponsored Products bids never scale a negative-margin SKU.
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.
It deducts landed COGS, 15% referral fees, 2026 dimensional FBA fulfillment fees, $0.27-$0.68 inbound placement fees, aged storage, refund drag, and PPC TACOS per SKU.
Seller Central views often omit landed freight/tariffs, single-shipment inbound placement surcharges, unsellable return write-offs, and blended ad spend (TACOS).
No. All CSV parsing and fee waterfall calculations run 100% locally in your browser RAM so your supplier pricing and winning ASIN margins stay completely private.
Unlike $97/mo recurring cloud suites requiring Seller Central API tokens, Fbaskustudio works instantly on local CSV exports for a $19 one-time lifetime buyout.
Single-destination FBA shipments add $0.27-$0.68+ per unit, while low-inventory (<28 days supply) and aged storage (181+ days) surcharges can cut net margins by 6%-12%.
Unlocking reveals all 100% of your SKU rows, exports a clean CSV ledger with per-SKU net profit, margin %, break-even ACOS, minimum safe ROAS, and delivers the offline PRO app.