FBA Storage Fees Calculator | Optimize Restocking & Margins with FBAZN

Introduction: Storage Fees Are Eating Your Margins

If you're selling on Amazon FBA as a UK seller, you already know that fees are relentless. Referral fees, fulfillment charges, and VAT all chip away at your bottom line—but there's one cost that catches most intermediate sellers off guard: storage fees.

Unlike fulfillment fees (which scale predictably with each sale), storage fees hit you based on how long inventory sits in Amazon's warehouses. During peak season or when turnover slows, storage can consume 10–40% of your gross profit on slow-moving SKUs. The problem is that most sellers only glance at referral and fulfillment charges in their Seller Central dashboard, completely underestimating the total fee burden until the quarterly storage invoice arrives.

Consider a realistic example: you source a product for £8 landed cost, sell it for £25, and expect a healthy margin. But if that unit sits in storage for four months during low-demand periods, the storage fee alone can eat £3–4 of your profit. Suddenly, your 50% gross margin becomes 30% net margin—and you didn't see it coming because you never modeled the storage cost impact before restocking.

This is where FBAZN's fee-aware profit calculator changes the game. Instead of guessing about storage fees, you can input your restocking frequency, seasonal demand patterns, and actual product dimensions—then see exactly what your net margin will be after all fees, including VAT, landed costs, and storage. The calculator reveals which restocking strategies maximize profit and which ones silently erode it, letting you make data-driven decisions about how often to replenish inventory.

The next section breaks down how storage fees are calculated and why they matter more than most sellers realize.

Understanding Amazon FBA Storage Fees: UK Structure and Peak vs. Non-Peak

Amazon FBA storage fees in the UK are charged per cubic foot per month, and the cost structure is one of the most significant variables affecting your net profit—especially during the busy trading calendar. Understanding exactly how these fees work is the foundation for making smart restocking decisions.

How UK FBA Storage Fees Are Calculated

Amazon calculates storage fees based on two main factors:

1. Product size category: Standard-size or oversize
2. Time of year: Peak season (15 October – 31 December) or non-peak (1 January – 14 October)

The fees are assessed on the 15th of each month based on the average daily inventory held during that month. This means your storage cost is locked in mid-month, making early removal or liquidation decisions crucial if you spot slow-moving stock.

Standard-Size vs. Oversize Rates

Standard-size products (typically smaller items under 18 × 14 × 8 inches) are charged at the lowest per-cubic-foot rate. As of recent fee schedules:

• Non-peak rate: approximately £0.87 per cubic foot per month
• Peak rate: approximately £3.48 per cubic foot per month (roughly 4× higher)

Oversize products face steeper charges and include a minimum monthly fee:

• Non-peak rate: approximately £0.43 per cubic foot per month, with a minimum fee per unit
• Peak rate: approximately £1.30 per cubic foot per month, also with minimum fees

Oversize items are also subject to per-unit minimums, so even a single large item can incur a fixed floor cost.

The Peak Season Impact

The jump from non-peak to peak rates is dramatic. A standard-size product holding 100 cubic feet of inventory could cost:

• Non-peak: £87 per month
• Peak: £348 per month

Multiply that across your entire catalog, and peak season storage costs can consume 20–40% of your gross profit if inventory is not carefully managed.

Why Cubic Footage Matters

Cubic footage is calculated from your product's dimensions (length × width × height in inches, divided by 1,728). A seemingly small item—say a phone case measuring 6 × 4 × 1 inch—uses only 0.014 cubic feet, but store 10,000 units and you're paying for 140 cubic feet monthly. Conversely, bulky items with lower sales velocity become storage liabilities fast.

Timing and Removal Strategy

Because fees are assessed on the 15th of each month, removing slow stock before that date saves you that month's charge. Many UK sellers remove or liquidate inventory in September to avoid peak-season fees entirely, or they hold off restocking until January 2nd to sidestep the peak window.

Using FBAZN's fee-aware profit calculator, you can model restocking frequency against storage cost projections. The calculator shows your true margin after Amazon fees, VAT, and shipping—including storage fees broken down by peak and non-peak periods. This lets you answer critical questions: If I restock 500 units in September, will I break even before peak season hits? Or should I wait until January? Having a clear landed cost and net margin view ensures you're not surprised by storage fees eroding your profit in November or December.

Next, we'll explore how to forecast your inventory turnover rate and use that insight to optimize restocking frequency.

The True Cost of Restocking: When Inventory Becomes a Liability

Restocking frequency is one of the most overlooked levers in FBA profitability. Many UK sellers fall into two traps: either they restock too often (bleeding money on logistics and import duties), or they restock too infrequently (watching storage fees devour margins month after month).

The Restocking Trade-Off

When you order small quantities frequently, you:

• Pay higher per-unit shipping costs from your supplier
• Handle more frequent customs clearance and VAT recalculation
• Reduce the risk of dead stock sitting in the warehouse
• Tie up less working capital at any given time

When you order large quantities less often, you:

• Negotiate better unit costs with suppliers
• Spread shipping and import fees across more units
• Risk higher FBA storage fees if demand slows
• Lock capital into inventory for longer periods

How Storage Fees Compound Quietly

Consider a realistic UK seller scenario: you import a SKU with a landed cost of £4.50 per unit (including shipping, VAT, and duties). You sell it for £12.99. The math looks good until storage fees arrive.

If you hold 500 units in Q4 (peak season) at £0.27 per unit per month, that's £135 per month in storage alone. But if those 500 units sit into January and February (post-Christmas slump), suddenly you're paying £135 × 3 months = £405 in storage fees on a single SKU. Your true margin collapses from healthy profit to break-even or worse.

Now imagine you ordered smaller batches of 200 units every 6 weeks instead. You'd pay more per unit from your supplier and higher individual shipment costs, but you'd avoid warehousing 500 units during the seasonal trough. The real question is: which approach costs less overall?

This is where your fee-aware profit calculator becomes essential. By modeling cumulative storage costs against order frequency, you can see the true cost of inventory holding. Calculate your profit not just per unit sold, but per month the unit sits waiting for a buyer. Slow-moving SKUs—those selling only 5–10 per week—compound the storage cost burden dramatically and reduce overall margin far more than a faster-turning product.

Inventory Age and Seasonal Swings

Stock held 3+ months in peak season (October–December) costs significantly more than stock held in off-season months. A unit sitting from November to February absorbs four months of storage fees in the most expensive quarter. Some UK sellers deliberately run leaner inventory heading into January to avoid this trap.

Different SKUs demand different restocking strategies:

• Fast movers (20+ units/week): restock every 3–4 weeks to minimize storage fees and capture momentum
• Steady sellers (8–15 units/week): restock every 6–8 weeks, balancing order costs against storage accumulation
• Slow movers (under 5 units/week): restock only when stock drops below 2 weeks' supply, and consider whether the SKU is worth restocking at all

Finding Your Profitable Middle Ground

The fee-aware profit calculator lets you input your landed cost, order quantity, shipping cost per shipment, and expected monthly sales volume, then shows you the cumulative impact of storage fees on your net margin. Run scenarios: what if you order 300 units every 8 weeks versus 150 units every 4 weeks? The calculator models both and tells you which approach leaves more money in your pocket after all fees.

Next, we'll look at how to automate and optimize this decision-making across your entire product portfolio.

How FBAZN's Fee-Aware Profit Calculator Works

FBAZN's fee-aware profit calculator is purpose-built for FBA sellers operating in the UK marketplace. Unlike generic spreadsheet tools, it automatically deducts all relevant fees—referral, fulfillment, storage, and VAT—directly from your gross revenue to display your true net margin after every cost is accounted for.

Input Requirements

To begin, you'll need to gather four core data points:

1. ASIN – Enter the product code you're evaluating (or search by product name)
2. Cost Price – Your landed cost per unit (what you paid the supplier plus shipping to your UK warehouse)
3. Selling Price – Your current or planned Amazon listing price (GBP)
4. Expected Monthly Turnover Rate – How many units you estimate selling each month

These inputs form the foundation for all downstream calculations. If you're evaluating multiple SKUs, you can enter them sequentially or use the bulk ASIN import feature (available on the Advanced plan) to load a batch at once.

Automatic Fee Deduction

Once you've entered your inputs, the calculator automatically retrieves current Amazon fee rates for your category and applies them in real time. This includes:

• Referral fees (typically 15% for most categories, 45% for high-value categories)
• Fulfillment fees (weight and size-based; varies by tier)
• VAT (20% standard rate, automatically calculated on selling price)
• Long-term storage fees (if applicable; calculated monthly for inventory held beyond 90 days)

Because Amazon's fee structure changes periodically, having live fee rates baked into the calculator eliminates manual spreadsheet updates and reduces the risk of underestimating costs.

Restocking Scenario Modeling

One of the calculator's most powerful features is the ability to model multiple restocking frequency scenarios side-by-side. You can test:

• Weekly restocking – Smaller, more frequent orders (higher shipping frequency, lower storage risk)
• Monthly restocking – Standard mid-sized replenishment (balanced cash flow and warehousing)
• Quarterly restocking – Bulk orders (lower per-unit shipping, but higher storage fee exposure)
• Custom intervals – Define your own cycle if you use a non-standard strategy

Each scenario recalculates your net margin based on the restocking frequency you select, automatically adjusting storage fee liabilities.

Landed Cost Breakdown

The calculator displays a transparent landed cost view, showing you:

• Product cost (supplier invoice)
• Shipping cost to UK warehouse (per unit)
• Total landed cost per unit

This figure is essential for understanding your baseline investment before any Amazon fees apply. Many sellers overlook shipping costs in their margin calculations; FBAZN explicitly surfaces them to prevent profit surprises.

Net Margin Interpretation

The output screen shows your net margin for each restocking scenario—this is profit per unit after all fees and storage charges. You'll see two key metrics:

• Absolute net margin (GBP) – Profit in pounds per unit sold
• Net margin percentage – Profit as a percentage of your selling price

For example, a product with a £10 selling price and £4.50 landed cost might show a 35% net margin under weekly restocking but only 28% under quarterly restocking (due to accumulated storage fees). This side-by-side comparison helps you identify the sweet spot between holding costs and restocking frequency.

Export and Save Functionality

Once you've run calculations for a product, you can save the comparison directly to your lead vault for future reference or export it as a CSV file for spreadsheet analysis. This is particularly useful if you're managing dozens of SKUs or sharing profitability data with your sourcing team.

Understanding how these variables interact in your profit model is the first step toward building a sustainable inventory strategy that minimizes dead capital tied up in storage fees.

Real-World Scenario: Comparing Restocking Frequencies with the Calculator

Let's walk through a practical example using FBAZN's fee-aware profit calculator to evaluate restocking strategies for a mid-range product sold by a UK FBA seller.

Scenario Setup

You're selling a fitness accessory with these baseline metrics:

• Product cost: £15 (landed)
• Selling price: £45
• Average monthly turnover: 50 units
• Unit weight: 500g (standard-size category)
• Planning horizon: Full calendar year including peak season (November–December)

You're evaluating three restocking strategies to determine which maximizes net margin after all Amazon fees and storage costs.

Strategy 1: Monthly Restocking

Approach: Order 50 units every month, maintaining minimal inventory buffer.

Calculator inputs:

• Monthly shipment: 50 units
• Average on-hand inventory: ~50–75 units (accounting for sales velocity)
• Storage fee during standard months (Jan–Sep): ~£0.27/unit
• Storage fee during peak months (Oct–Dec): ~£0.82/unit

Annual totals:

• Total Amazon referral fees (15% category): £2,700
• Fulfillment fees (standard-size): £675
• Standard storage (9 months × 60 units × £0.27): £145.80
• Peak storage (3 months × 100 units × £0.82): £246
• Total annual fees & storage: £3,766.80
• Gross revenue: £27,000 (600 units/year × £45)
• Cost of goods: £9,000 (600 units × £15)
• Net margin: 32% (after VAT and all fees)

Pros: Lower storage burden, faster cash flow, flexibility to adjust. Cons: Frequent shipments increase logistics costs and carrier fees.

Strategy 2: Quarterly Restocking

Approach: Order 150 units four times per year, planning inventory to cover 12-week cycles.

Calculator inputs:

• Quarterly shipment: 150 units
• Average on-hand inventory: ~180–220 units
• Storage fee during standard months: £0.27/unit
• Storage fee during peak months: £0.82/unit

Annual totals:

• Total Amazon referral fees: £2,700
• Fulfillment fees: £675
• Standard storage (9 months × 180 units × £0.27): £436.40
• Peak storage (3 months × 250 units × £0.82): £615
• Total annual fees & storage: £4,426.40
• Gross revenue: £27,000
• Cost of goods: £9,000
• Net margin: 28% (notably lower due to extended storage liability)

Pros: Fewer shipments, better bulk purchasing leverage. Cons: Higher peak-season storage fees accumulate; capital tied up longer; less flexibility.

Strategy 3: Bi-Monthly Restocking (Recommended)

Approach: Order 100 units every two months, balancing inventory depth and storage exposure.

Calculator inputs:

• Bi-monthly shipment: 100 units
• Average on-hand inventory: ~110–140 units
• Storage fee during standard months: £0.27/unit
• Storage fee during peak months: £0.82/unit

Annual totals:

• Total Amazon referral fees: £2,700
• Fulfillment fees: £675
• Standard storage (9 months × 120 units × £0.27): £291.60
• Peak storage (3 months × 160 units × £0.82): £393.60
• Total annual fees & storage: £4,060.20
• Gross revenue: £27,000
• Cost of goods: £9,000
• Net margin: 30% (optimal balance)

Pros: Moderate storage costs; regular cash flow; predictable shipment rhythm; reduced overstocking risk during peak season. Cons: Requires disciplined forecasting and slightly more frequent ordering than quarterly.

Why the Calculator Matters Here

Without FBAZN's fee-aware profit calculator, you might assume quarterly restocking (fewest shipments) would be most profitable—but the data reveals the opposite. The calculator's landed cost + net margin view shows exactly how storage fees compound across peak season, exposing the hidden cost of over-inventory. By running side-by-side comparisons in the calculator, you can see that bi-monthly restocking captures 30% net margin while keeping cash flow predictable and reducing storage liability during the most expensive months (October–December).

The calculator also accounts for VAT recovery timing and Amazon fee structures, so the margin figures reflect what actually lands in your account, not theoretical gross profit.

Understanding storage fee impact during peak season is crucial for UK sellers aiming to optimize long-term profitability.

Using Market Signals and Lead Vault to Identify High-Margin Restocking Opportunities

While the fee-aware profit calculator gives you the numbers, FBAZN's market snapshot and lead vault transform those numbers into actionable restocking decisions. Together, these tools help you identify which products genuinely justify frequent restocking and which should be managed more conservatively to avoid storage cost traps.

Market Snapshot: Real-Time Demand Intelligence

The market snapshot module tracks live market signals—price movements, sales rank changes, and competition trends—across your watched categories. For restocking decisions, this means you can see which SKUs are moving fast enough to justify aggressive replenishment cycles.

Fast-moving products (those climbing in sales rank or holding stable prices under competitive pressure) are prime candidates for weekly or bi-weekly restocking because they convert stock quickly and minimize long-term storage liability. A product turning 8–10 times per year benefits from frequent small orders, as each unit spends less time in the warehouse.

Conversely, market signals showing declining sales rank or price compression warn you to slow down restocking on slower movers, protecting your margin and avoiding the storage fee creep that kills profitability.

Lead Vault: Competitor Pricing and Margin Notes

Your lead vault stores detailed notes on competitor pricing, your own landing costs, and historical margin performance for every ASIN you track. This becomes your restocking playbook.

When you're deciding whether to restock a product this month, pull up its lead vault entry and cross-reference:

• Current competitor pricing versus your stored cost
• Your margin notes from previous restocking cycles
• Seasonal trends you've recorded (e.g., "Q4 margin jumps 15% but storage fees spike in January")

If a product's margin note shows it consistently achieves 25% net profit during peak season but drops to 12% in off-season after storage hits, the lead vault reminds you to front-load inventory before peak and minimize restocking during the slow period.

Opportunity Scoring: Rank Your Restocking Priority

OFBAZN's opportunity scoring ranks your tracked products by restocking potential. This scoring combines demand velocity (from market signals), margin stability (from your lead vault notes), and storage cost impact (from the profit calculator).

Intermediate UK sellers often manage 50–200 SKUs; opportunity scoring lets you focus restocking energy on the top 15–20 that deliver the highest profit-per-unit and lowest storage drag. A product scoring 8/10 on opportunity merit (high demand, stable margin, low storage burden) deserves aggressive restocking; a 3/10 product should be restocked only when stock depletes naturally.

Seasonal Adjustments and Competitive Strategy

Market signals also flag seasonal patterns. If your lead vault shows that a Christmas decoration product sells 500 units in October–November but 5 units in May–June, the profit calculator reveals the true cost of holding overstock: that June inventory sitting in FBA is costing you £2–3 per unit in storage fees while generating near-zero sales.

Use market snapshot to identify the exact peak window (often 4–6 weeks before the seasonal spike), restock heavily then, and avoid restocking during the trough.

Next, we'll walk through a practical worked example that ties all these tools together into a restocking decision framework.

Step-by-Step: How to Use FBAZN's Calculator to Plan Your Restocking Strategy

Step 1: Import or Manually Enter Your Product Details Log into your all-in-one Amazon FBA dashboard and navigate to the fee-aware profit calculator. Enter your ASIN, or use the bulk ASIN import feature (Advanced plan) if you're evaluating multiple SKUs. Input your landed cost (purchase price + shipping to UK warehouse) and current selling price. Double-check these figures against your supplier invoices and live Amazon listings to ensure accuracy.

Step 2: Set Expected Monthly Sales Volume Based on your historical sales data, enter your realistic monthly unit sales forecast. Pull this from your Seller Central reports or use live market signals to understand current demand trends. Conservative estimates are better than optimistic ones—use the last 3–6 months' average if your product is stable, or adjust for seasonality if applicable.

Step 3: Choose a Baseline Restocking Frequency Start with your current restocking pattern (e.g., monthly, bi-monthly, or quarterly). The calculator will show you the total storage fee burden at this frequency. Note the net margin percentage and storage fee total displayed in the calculator results panel.

Step 4: Run the Calculator and Review Initial Findings Click the "Calculate" button and study the breakdown. The calculator shows your true margin after Amazon fees, VAT, shipping, and storage costs. Screenshot or note the net margin % and total monthly/quarterly storage fee for comparison in later steps.

Step 5: Model Alternative Restocking Frequencies Change the restocking frequency to bi-monthly, then quarterly, and run the calculator each time. Compare the net margin and storage fee columns side by side. You'll quickly see the cost of holding excess inventory—often revealing that more frequent restocking (despite higher shipment costs) yields better margins.

Step 6: Export or Save Scenarios for Seasonal Review Save each scenario using the "Save Scenario" button (or take detailed notes). Label them clearly—e.g., "Monthly Restock Q1", "Quarterly Restock Q4"—so you can review and adjust seasonally. Store these in your lead vault or a dedicated spreadsheet for future reference.

Step 7: Adjust Cash Flow Projections and Restock Budget Once you've identified your optimal restocking frequency, update your cash flow forecasts and restock purchase budget accordingly. If quarterly restocking yields 2% higher margins but requires £500 more upfront capital, decide whether your cash position supports it. Use the calculator's landed cost view to determine exactly how much inventory investment each scenario requires.

Step 8: Monitor Actual Storage Fees and Validate Estimates After implementing your new restocking plan, track your actual storage fees in Seller Central each month. Compare them against the calculator's projections. Over 2–3 months, you'll see whether the model holds true, and you can fine-tune sales volume assumptions or restocking dates to improve accuracy for future planning cycles.

Once you've optimized your restocking strategy, the next critical step is monitoring and adjusting it based on real market conditions and competition changes.

Restocking Frequency Comparison Table: Storage Costs vs. Net Margin

This table illustrates a critical insight for UK FBA sellers: more frequent restocking keeps inventory lean and storage costs low, preserving net margin even at lower absolute profit per unit. For a typical mid-range product selling 50 units monthly, weekly restocking minimizes storage fees (£45 annually) while maintaining the highest net margin at 34%, translating to £4,200 annual profit. As restocking frequency decreases, average inventory levels rise sharply—jumping from 12 units weekly to 150 units quarterly—pushing annual storage costs up to £380 and compressing net margin to just 28%.

The fee-aware profit calculator within FBAZN is invaluable for stress-testing these scenarios. Rather than guessing which restocking cadence works best, you can input your actual product cost, selling price, and expected monthly sales volume, then instantly see how storage fees erode your true margin after all Amazon fees, VAT, and shipping. This tool automatically accounts for seasonal storage surcharges (October–December), so you avoid nasty surprises when Q4 fees spike. By running side-by-side comparisons across different restocking frequencies, you'll discover that weekly or bi-weekly strategies often outperform bulk quarterly shipments for high-turnover SKUs—turning what looks like a smaller order into a smarter, more profitable one.

Understanding these trade-offs is the foundation of sustainable inventory management; the next step is learning how to forecast demand accurately so you can restock just enough without understocking.

FAQ: Common Questions About Storage Fees and Restocking Strategy

Q: Should I time large restocks to avoid peak season?

A: Yes. Restocking in September helps you avoid the October 15 peak-season fee increase (£3.22/unit vs. £0.87/unit for standard storage). The fee-aware profit calculator shows exactly how much you'll save by planning restocks earlier in the year, so you can model different timing scenarios and choose the most cost-effective window.

Q: How does the calculator handle slow-moving products?

A: Input your actual monthly turnover rate into the calculator. If you see high storage costs relative to your profit margin, that's a signal to rethink your restocking strategy—either reduce order quantities, accelerate promotions, or consider removing slow stock to free up space.

Q: Can I use the calculator for new product launches?

A: Absolutely. Enter conservative estimated turnover figures for new products. This helps you avoid overstocking and excess storage fees while you're still gathering real sales data, protecting your margin in those critical first months.

Q: Does bulk ASIN import help compare restocking strategies across my catalog?

A: Yes. Advanced plan users can load multiple ASINs and compare profit scenarios for each one in a single view. This makes it much faster to prioritize which products deserve larger restocks and which should be ordered more conservatively.

Q: What if my storage fees spike unexpectedly?

A: Check Seller Central to confirm whether your inventory volume increased or a fee period changed. Then use the calculator to model different scenarios—when to reduce stock via removal orders or how much faster you'd need to restock to keep fees manageable.

Q: How often should I recalculate my restocking strategy?

A: Recalculate quarterly. Update the calculator with your actual turnover data and re-run profit projections before peak season hits (August and September are ideal times to adjust your Q4 restocking plan).

Once you've optimized your restocking timing and storage costs, understanding how to leverage market signals ensures you're restocking the right products at the right volumes.

Conclusion: Take Control of Storage Costs and Maximize Net Profit

Amazon FBA storage fees are often the most underestimated cost eating into your net margins—but they're also one of the most controllable. The difference between a profitable quarter and a squeezed one often comes down to a single decision: how frequently you restock each SKU.

Restocking too often inflates your logistics costs; too infrequently and you're paying premium storage fees on dead inventory. Finding that sweet spot is where real margin optimization happens. Rather than guessing or relying on outdated rules of thumb, use FBAZN's fee-aware profit calculator to model different restocking scenarios and see exactly how each frequency choice affects your net profit after Amazon fees, VAT, and shipping.

Key takeaways to remember:

• Storage fees are controllable—restocking frequency is the lever you pull
• Quarterly reviews of your restocking strategy ensure margins stay optimized as demand shifts
• Start with 2–3 key SKUs and use the calculator to set a baseline restocking cadence, then expand
• Use market signals and your lead vault to prioritize which products deserve aggressive restocking investment
• Model profit after all fees: the calculator removes guesswork and shows you true net margin

The sellers who win aren't the ones guessing at inventory levels—they're the ones making data-backed restocking decisions that balance cost and efficiency. With FBAZN's all-in-one Amazon FBA dashboard and fee-aware profit calculator, you have the tools to stop leaving money on the table.

Ready to take control? Import your first ASIN into FBAZN today and run your first restocking scenario—you'll immediately see how small adjustments to frequency can unlock significant margin gains.

Frequently Asked Questions

How does FBAZN's fee-aware calculator account for FBA storage fees?

FBAZN calculates both standard-size and oversize storage fees based on cubic footage, time of year (peak/non-peak), and automatically deducts them from your gross profit to show true net margin.

Can the calculator help me decide how often to restock inventory?

Yes. By comparing profit scenarios at different restocking frequencies, you can see the net margin impact of holding more stock versus more frequent smaller orders.

Does FBAZN include VAT in the profit calculation?

Yes, FBAZN is UK-focused and factors VAT into all fee calculations so you see true profit after tax.

What other fees does the calculator include besides storage?

The calculator includes referral fees, FBA fulfillment fees, promotional fees, VAT, and shipping/landed costs to show complete margin visibility.

How can I compare profitability across multiple ASINs at once?

Use FBAZN's bulk ASIN import feature (Advanced plan) to load multiple products and run profit scenarios side-by-side with the calculator.

What is landed cost and why does it matter in the calculator?

Landed cost is your product cost plus shipping to Amazon's UK warehouse. FBAZN separates landed cost from net margin so you see exactly where money is spent.