FBA Storage Fee Calculator 2026: Storage & Aged Inventory
Estimate Amazon FBA monthly storage, aged-inventory surcharge exposure, removal break-even, and sell-through risk before sending inventory.
Product Specs
Check Seller Central size tier, then send only the quantity you expect to sell before day 181.
Cumulative Cost Projection (8 Months - Month 7+ = Surcharge Zone)
FBA Storage Rules (2026)
Monthly Rates (per cu ft)
Aged Inventory Penalty
- 181+ Days: Monthly surcharge kicks in, then escalates sharply at 271, 301, 331, 366, and 456 days.
- Removal Orders: Often cheaper than paying 3 months of peak storage.
- Peak season: Use the October-December monthly storage rate when inventory will sit through Q4.
- Source check: Checked 2026-08-06 against Amazon Seller Central monthly and aged inventory fee pages.
How to Use the Amazon FBA Storage Fee Calculator
This calculator helps Amazon FBA sellers estimate monthly and long-term storage costs before sending inventory to fulfillment centers-essential for avoiding Amazon's brutal aged inventory surcharges that can destroy profit margins.
- Enter Product Dimensions: Length, width, and height in inches (measure your packaged product, not just the item itself).
- Set Quantity: How many units you're sending to FBA. Storage fees scale with volume.
- Select Storage Type: Standard-size, oversize/bulky, dangerous goods standard, or dangerous goods oversize. Fees vary significantly.
- Choose Current Season: Off-Peak (Jan-Sep) or Peak (Oct-Dec). Peak season rates are 208% higher for standard items ($2.40 vs $0.78 per cu ft).
- Estimate Days in Storage: How long the inventory will sit before selling. 181+ days triggers Aged Inventory Surcharge.
The calculator shows: (1) total cubic feet (Amazon's billing metric), (2) monthly storage fee, (3) total cost for your estimated period, (4) per-unit storage cost, and (5) 8-month cumulative projection with aged inventory warnings. Use this BEFORE sending slow-moving inventory to FBA.
What This Calculator Covers: Storage Fees, Aged Surcharges & Peak Season Rates
Amazon FBA storage fees are one of the biggest hidden costs that bankrupt new sellers. They seem small at first - $0.78/cubic foot/month in Amazon's standard-size off-peak example - but compound rapidly, especially during peak season (Oct-Dec) and for aged inventory (181+ days).
Real Cost Breakdown: 100 Units of Slow-Moving Inventory
The Problem: New FBA sellers send 200-500 units of untested inventory, thinking "More volume = more profit." They don't account for storage fees. If the product takes 8 months to sell (common for niche items), those 100 units cost you $250-350 in storage alone-erasing 20-40% of profit margin. If it sits for 12+ months? You're paying $500+ while Amazon sends removal fee invoices.
The Solution: Always calculate storage costs per unit BEFORE sending inventory. If storage will cost $2-3/unit over 6 months but your margin is only $8, you're leaving $2-3 on the table (25-37% margin erosion). Smart FBA sellers send small test batches (20-50 units), measure sell-through rate, then scale only winners. This calculator prevents you from sending $5,000 of inventory that costs $800 to store.
3 FBA Storage Mistakes That Cost Thousands
1Sending Bulk Inventory Before Testing Sell-Through Rate
The biggest mistake: Wholesaling 500 units of a product that looks profitable on paper, sending it all to FBA, then watching it sit for 9 months. At $0.22 cu ft/unit and $0.78/month off-peak, 500 units cost you $85.80/month before aged surcharges. If your margin was $4/unit ($2,000 total profit), regular storage plus late-stage aged inventory charges can erase the profit you thought you had. Always test with 20-50 units first. If sell-through is <30 days, scale to 200+. If it's 90+ days, don't send more.
2Ignoring Aged Inventory Surcharge (181+ Days = Profit Killer)
Amazon charges an Aged Inventory Surcharge for many units sitting 181+ days: $0.50/cu ft/month initially (181-210 days), then $1.00, $1.50, $5.45, $5.70, $5.90, $6.90, and finally $7.90/cu ft/month or $0.35/unit at 456+ days, whichever is greater. The early 181-270 day tiers exclude clothing, shoes, bags, jewelry, and watches, so verify your category. If inventory has not sold by 120-150 days, run markdown, removal, or liquidation math before the next aged-inventory snapshot.
3Not Planning Around Peak Season (Oct-Dec Fees Triple)
During October-December, Amazon's standard-size storage rate is much higher than the off-peak example rate ($0.78 to $2.40/cu ft). If you have 300 units sitting in FBA during Q4, your monthly storage cost can move from roughly $51 to $158 before any aged-inventory surcharge. Use smaller replenishment batches, Q3 clearance, or FBM for bulky slow movers before Q4 storage stacks on old inventory.
Real Example: Storage Costs for 6-Month FBA Product
Let's walk through a realistic scenario to show how storage fees compound:
The Scenario
You source 200 units of a kitchen gadget at $8 wholesale. Sale price is $25. After Amazon's 15% referral fee ($3.75) + $3.50 FBA fulfillment, your margin is $9.75/unit. You expect to sell 40-50 units/month (4-5 month sell-through). Product dimensions: 10×6×3 inches.
Storage cost per unit sold: $0.25 (spread across 200 units over 4 months).
Original margin: $9.75/unit
After storage: $9.50/unit (2.5% margin erosion)
Manageable. But if sell-through was 8 months instead of 4, storage would cost $120+ ($0.60/unit), dropping margin to $9.15-a 6% erosion. This is why you must estimate sell-through before sending inventory.
The Lesson: For fast-moving products (30-60 day sell-through), storage fees are negligible (2-5% of margin). For slow-movers (120+ days), storage can eat 10-20% of profit. Use this calculator BEFORE sending inventory to FBA-if estimated storage cost is >10% of your margin, either don't send it or send smaller test batches.
Pro Tips for Minimizing FBA Storage Costs
Never send 200+ units of an untested product. Start with 20-50 units to measure actual sell-through rate. If it sells in 30 days, send 200 more. If it takes 90 days, you've only paid storage on 50 units instead of 500-saving $100-300.
If inventory is not selling by day 120, run a markdown, coupon, outlet, removal, or local liquidation plan before the 181-day aged-inventory window. Enter your actual removal fee above because Amazon removal/disposal rates vary by size and weight.
Storage fees are charged per cubic foot, so bulky items with low sale prices (e.g., bean bags, pillows, large toys) get destroyed by storage costs. Use FBM (Fulfilled by Merchant) for low-density items and FBA only for compact, fast-moving products.
If you're sending Q4 inventory, ship it to arrive in late September to avoid early October peak fees. Conversely, for slow movers, delay shipment until January 15 when rates drop back to off-peak ($0.78 vs $2.40 for the standard-size example rate).
Use Amazon's inventory health and aged-inventory reports to watch stale units before they become invoice surprises. Monitor inventory approaching 150 days weekly and document whether the plan is markdown, removal, liquidation, or FBM.
When pricing products, add $0.50-1.00/unit for estimated storage costs (based on this calculator). If your break-even is $18 without storage but $19 with storage, price at $22-25 minimum to maintain healthy margins after all FBA costs.
The 150-Day FBA Decision Rule
If the product is moving and ranking well, send more only if the storage timeline stays comfortably below the aged inventory window.
At 120 to 150 days, stop thinking like a holder and start thinking like a liquidator. A small markdown early is usually cheaper than another storage cycle plus surcharge risk.
If the sell-through is weak and the item is bulky, removal or local liquidation may be the rational choice. Storage is not a strategy by itself.
Frequently Asked Questions: Amazon FBA Storage Fees
How much does Amazon FBA charge for storage in 2026?
Amazon's Seller Central example for standard-size monthly storage uses $0.78 per cubic foot per month off-peak (January to September), and this calculator uses $2.40 per cubic foot for October to December. Oversize items are $0.56 off-peak and $1.40 in peak months. Inventory stored 181 days or more also pays a monthly aged inventory surcharge, from $0.50 up to $7.90 per cubic foot at 456 days or more.
What is Amazon's Aged Inventory Surcharge?
It is a monthly charge on top of regular storage for FBA inventory stored 181 days or more: $0.50 per cubic foot at 181-210 days, $1.00 at 211-240, $1.50 at 241-270, $5.45 at 271-300, $5.70 at 301-330, $5.90 at 331-365, $6.90 at 366-455, and $7.90 at 456 days or more. The two oldest tiers have per-unit minimums of $0.30 and $0.35, and the calculator charges whichever is higher. Clothing, shoes, bags, jewelry, and watches skip the 181-270 day tiers. If inventory isn't selling by day 150, remove it or run a clearance sale.
How do I calculate FBA storage fees for my product?
Measure the packaged product in inches, multiply length by width by height, and divide by 1,728 to get cubic feet. Then multiply by Amazon's rate ($0.78 off-peak or $2.40 peak for standard size). Example: a 12 x 8 x 4 inch item is 384 cubic inches, or 0.22 cubic feet, so off-peak storage is about $0.17 per unit per month. Multiply by your quantity and the months you expect it to sit in FBA.
Should I remove inventory to avoid FBA storage fees?
Sometimes. If an item is approaching 150 days without selling, compare the removal cost with the next few months of storage and aged inventory surcharges. Removal and disposal charges vary by size and weight, so enter the current Seller Central estimate in the calculator. If removal costs less, remove or liquidate instead of paying monthly to store stale inventory.
Are oversize items cheaper to store on Amazon FBA?
Per cubic foot, yes: oversize storage is $0.56 per cubic foot off-peak against the $0.78 standard-size rate. But oversize items take far more space, so the monthly cost per unit is usually higher. A 24 x 18 x 12 inch item is 3 cubic feet, or $1.68 a month at $0.56, while a 12 x 8 x 4 inch standard item is about $0.17 a month.
How can I reduce my Amazon FBA storage costs?
Send small test batches before scaling, watch the Aged Inventory report and clear units approaching 150 days, avoid carrying stale units into October to December, use FBM for bulky or slow items, run markdowns or removals before aged surcharges start, and re-measure packaged dimensions before sending. Use this calculator before you send inventory so storage costs are part of the buy decision.
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