01
Select a size tier or enter custom dimensions
Choose your FBA size tier from Amazon's 16-tier table. Or select "Custom" and enter length, width, and height in inches to compute cubic feet directly from your product dimensions.
Amazon Storage Fee Calculator
Calculate Amazon FBA monthly and long-term storage fees by size tier and season.
Updated Reviewed by Sajid Hussain· Editor
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Last updated
June 7, 2026
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Amazon FBA storage costs
FBA storage fees: the cost that compounds quietly and erodes margin fast
Amazon FBA storage fees are the monthly charges Amazon deducts for storing your inventory in their fulfillment centers — calculated by the cubic feet your units occupy, the size classification (standard or oversize), and the time of year. Off-peak months (January through September) use one rate; Q4 (October through December) is roughly three times higher to manage warehouse capacity during peak season. Inventory held past 365 days triggers a separate long-term storage fee in addition to the standard monthly rate.
Amazon FBA storage fees are charged monthly based on the cubic feet your inventory occupies. The rate depends on two factors: whether your product is standard-size or oversize, and what time of year it is. Off-peak months (January through September) use one rate; Q4 (October through December) triples the cost for standard items to manage warehouse capacity.
For most FBA products, monthly storage fees are small — a few cents per unit per month. But they compound. A product that sits for six months because of slow demand or poor forecasting accumulates six months of fees. And if inventory crosses the 365-day threshold, Amazon adds a long-term storage fee — the greater of 6.90 per cubic foot or 0.15 per unit — assessed monthly on top of the standard rate.
The long-term storage fee is where sellers get hurt. A product that sits for 14 months at 6.90 per cubic foot is not a nuisance cost — it is a significant drain on working capital. This calculator surfaces that fee explicitly so you can see it in advance.
Storage fees are calculated from your product's cubic feet, which come from the size tier or from exact dimensions. Enter either the size tier or your custom dimensions (length × width × height in inches) and the calculator computes everything else.
Quick facts
- Rate types
- Off-peak + Q4 + long-term storage fees
- Size tiers
- 16 FBA size tiers + custom dimensions
- Season handling
- Q4 multiplier applied automatically
- Long-term warning
- LTS fee flagged at 12+ months
- Fee schedule
- Amazon 2026 US rates
- Time to result
- < 5 seconds
How it works
From size tier to full storage cost in 4 inputs
Select your size tier or enter custom dimensions, set your unit count and season, and see monthly fees, total cost, and any long-term storage exposure.
02
Enter units in storage and season
How many units are at Amazon warehouses and which season applies (off-peak Jan–Sep or Q4 Oct–Dec). Season determines the per-cubic-foot rate.
03
Set months stored
How long the inventory will be stored. Crossing 12 months (365 days) triggers the long-term storage fee — the calculator flags it and shows the additional cost.
04
Read the full cost
Monthly storage fee, total cost over the period, storage fee per 1,000 units, and long-term storage fee (if applicable) — all based on Amazon's 2026 rate schedule.
Steps to use the Amazon Storage Fee Calculator: Select a size tier or enter custom dimensions, Enter units in storage and season, Set months stored, Read the full cost.
Formulas
How Amazon FBA storage fees are calculated
Amazon's storage fee formula is straightforward — the complexity comes from the Q4 multiplier and the long-term fee rule.
01
Cubic feet per unit (from dimensions)
Cubic Feet = (Length × Width × Height in inches) ÷ 1,728
Amazon measures outer package dimensions. 1,728 = 12³ (the number of cubic inches in a cubic foot).
Example: 12×8×4 inches = 384 ÷ 1,728 = 0.222 cuft
02
Monthly storage fee (off-peak)
Monthly Fee = Total Cubic Feet × 0.78 (standard) or 0.56 (oversize)
Applied January through September. Total cubic feet = cubic feet per unit × number of units.
03
Monthly storage fee (Q4)
Monthly Fee = Total Cubic Feet × 2.40 (standard) or 1.40 (oversize)
Applied October through December. Approximately 3× the off-peak rate for standard items.
04
Total storage cost over period
Total Cost = Monthly Fee × Months Stored
The cumulative storage cost over your planned hold period.
05
Long-term storage fee (365+ days)
LTS Fee = max(Total Cubic Feet × 6.90, Units × 0.15) per month
Charged monthly on all inventory aged over 365 days, in addition to the regular monthly fee. Whichever is greater: the cubic-foot rate or the per-unit rate.
Example: 18 cuft × 6.90/cuft = 124.20 vs 100 units × 0.15/unit = 15.00 → LTS fee = 124.20
Worked example
500 units, small standard, 3 months off-peak: storage cost in full detail
A realistic scenario for a small standard product stored off-peak for a quarter.
Scenario
You have $500.00 units of a Small Standard ≤ 4 oz product at Amazon FBA warehouses during Off-peak (Jan–Sep). Each unit is 0.02 cubic feet.
1
Step 1 · Calculate total cubic feet
$500.00 units × $0.02 cuft/unit = $10.00 cubic feet total in storage.
$10.00 cubic feet
2
Step 2 · Apply the storage rate
$10.00 cuft × 0.78/cuft = $7.80 per month. This is the off-peak standard-size rate for Off-peak (Jan–Sep).
$7.80 per month
3
Step 3 · Project over the storage period
$7.80/month × $3.00 months = $23.40 total storage cost for the quarter.
$23.40 total
4
Step 4 · Per-unit storage cost
$7.80 ÷ $500.00 units = 0.0156/unit/month. At $15.60 per 1,000 units, this is a small per-unit cost — but it compounds with slow sell-through.
$15.60 per 1,000 units/month
The takeaway
A small standard product costs $7.80 per month in storage at 500 units — inexpensive individually, but $23.40 over a quarter. The risk is if sales slow: each additional month adds $7.80.
Benchmarks
Typical FBA storage costs by product size tier
Storage cost varies enormously by size tier. Small standard products cost less than 0.02 per unit per month; large bulky items cost over 3.00.
| Metric | Poor | Average | Good | Excellent |
|---|---|---|---|---|
Small Standard (≤ 4 oz, 0.02 cuft) — monthly per unit Amazon Seller Central Storage Fee Schedule 2026 | > 0.04 | 0.016 | 0.016 | 0.016 |
Large Standard (12–16 oz, 0.18 cuft) — monthly per unit Amazon Seller Central Storage Fee Schedule 2026 | > 0.30 | 0.14 | 0.14 | 0.14 |
Small Bulky (0–50 lb, 1.50 cuft) — monthly per unit Amazon Seller Central Storage Fee Schedule 2026 | > 2.00 | 1.17 | 1.17 | 1.17 |
Large Bulky (50–150 lb, 4.00 cuft) — monthly per unit Amazon Seller Central Storage Fee Schedule 2026 | > 5.00 | 3.12 | 3.12 | 3.12 |
Healthy days-of-supply (inventory cover) Amazon Seller Central — Inventory Performance Dashboard | > 120 days | 60–90 days | 30–60 days | < 30 days |
Tool comparison
Calcrux vs. other FBA storage fee tools
| Feature | Feature | Calcrux (free) | Jungle Scout Storage Calculator | Amazon Revenue Calculator |
|---|---|---|---|---|
| All 16 FBA size tiers | ||||
| Custom dimensions (L×W×H) | ||||
| Q4 storage rate (Oct–Dec) | ||||
| Long-term storage fee (365+ days) | ||||
| Monthly × period total cost | ||||
| Per-1,000-unit storage metric | ||||
| No signup required | ||||
| Works without seller account |
Common mistakes
FBA storage mistakes that turn a small fee into a major cost
Sending too much inventory to avoid stockouts
Why it matters
Over-sending to cover worst-case demand means units sit in Amazon warehouses for months. Each month adds storage fees; crossing 365 days adds the long-term fee. The cost of over-stock often exceeds the cost of a brief stockout.
Fix
Calculate your optimal reorder quantity using the FBA Restock Calculator. Target 60–90 days of inventory at Amazon warehouses — enough to stay in stock without excess.
Sending inventory in September without considering Q4 rates
Why it matters
October 1 triggers Q4 storage rates — roughly 3× higher for standard items. A shipment arriving in late September will carry all its Q4 storage at the higher rate if it does not sell quickly during the peak season.
Fix
Either arrive with enough velocity to sell through in October–November, or time your main replenishment to arrive before September 30 and aim to sell out by January.
Forgetting the long-term storage fee on slow-moving SKUs
Why it matters
The long-term storage fee for inventory aged 365+ days (6.90/cuft or 0.15/unit/month) is often larger than the regular monthly fee — particularly for bulky products. It fires every month until the inventory is sold or removed.
Fix
Monitor the "Inventory Age" report in Seller Central. Remove or liquidate any units approaching 300 days to avoid the 365-day threshold.
Not including storage fees in per-unit profitability models
Why it matters
Storage fees are a real monthly cost that erodes per-unit margin. A product that takes 4 months to sell accumulates 4 months of storage that should be included in the profitability model.
Fix
Estimate your average days-of-supply and convert the monthly storage fee to a per-unit cost: (monthly storage fee ÷ units stored) × average months in storage.
Using the wrong size tier
Why it matters
Amazon assigns size tiers based on the outer packaged dimensions, not the product's unpackaged size. Using a smaller tier to estimate costs understates storage fees if your packaging pushes you into a larger tier.
Fix
Measure your actual packaged dimensions (with any protective packaging). If close to a tier boundary, use the "Custom" option in this calculator to compute cubic feet from exact measurements.
Pro tips
How to manage FBA storage costs for better margins
Compare SKUs by storage efficiency
Monthly storage fee per 1,000 units lets you compare storage efficiency across products with different unit counts. A product at 15 per 1,000 units is far more storage-efficient than one at 150 per 1,000 units — and this metric makes the difference visible at a glance.
Schedule removals before day 300
In Seller Central, set up automated removal orders for inventory approaching 300 days. The removal fee (0.97–3.12 per unit depending on size) is almost always cheaper than the long-term storage fee for an additional 3+ months.
Factor storage into restock quantities
When deciding how much inventory to send, compare the storage fee cost of excess units against the risk and cost of a stockout. For most products, it is cheaper to accept brief stockouts than to pay long-term storage fees on excess inventory.
Watch IPI for storage risk
A low IPI score indicates excess or stranded inventory that is accumulating storage fees. Use the Amazon IPI Score Calculator alongside this storage fee calculator to understand the financial impact of a falling IPI before Amazon imposes storage limits.
Model Q4 storage before pricing
If you hold inventory through Q4, add the Q4 storage cost to your profitability model. A product that is marginally profitable at off-peak rates may be unprofitable at 3× storage during October–December.
Who uses this
When sellers reach for the Storage Fee Calculator
The Amazon Storage Fee Calculator works across every stage of the workflow.
Seller planning a Q4 inventory shipment
Models the Q4 storage cost of sending 2,000 units in September vs. 1,000 units in September plus 1,000 in November — to find the inventory strategy that minimises storage fees while staying in stock.
Seller with slow-moving inventory approaching 300 days
Calculates the long-term storage fee that will apply at 365 days and compares it to the removal fee — to decide whether to liquidate, remove, or continue holding the inventory.
New seller estimating true FBA costs before a product launch
Estimates monthly storage cost for the planned inventory level before placing a purchase order — so storage is included in the break-even model from day one.
Finance lead building an Amazon cost model
Uses the monthly storage fee and per-unit metric to build accurate unit economics for the monthly P&L — storage is modelled as a carrying cost tied to days-of-supply.
Multi-SKU seller comparing storage efficiency across the catalogue
Runs each product through the calculator and sorts by per-1,000-unit storage cost to identify which SKUs are the most and least efficient to hold at Amazon warehouses.
Glossary
FBA storage terms explained
Every important term you'll encounter in this calculator and the broader topic.
- FBA Monthly Storage Fee
- A recurring charge Amazon levies for storing your inventory in their fulfillment centers. Calculated monthly based on the daily average cubic feet your inventory occupies. Rate depends on size type (standard or oversize) and season (off-peak vs Q4).
- Long-Term Storage Fee (LTS)
- An additional monthly fee applied to inventory aged over 365 days at Amazon warehouses. Charged at the greater of 6.90 per cubic foot or 0.15 per unit, in addition to the regular monthly storage fee.
- Cubic Feet (cuft)
- The unit Amazon uses to measure storage space. Calculated as length × width × height (in inches) ÷ 1,728. Amazon assigns cubic feet values to each FBA size tier based on typical product dimensions.
- Q4 Storage Rate
- Amazon's elevated storage fee rate applied October–December to manage warehouse capacity during the peak season. Standard-size items cost 2.40/cuft vs 0.78/cuft off-peak — approximately 3× higher.
- Days-of-Supply
- The number of days your current inventory will last at your current sales velocity. Amazon uses days-of-supply as a key metric in the Inventory Performance Index (IPI). Targeting 30–90 days of supply minimises storage costs while maintaining in-stock status.
Help & answers
Frequently asked questions
Everything you need to know about how the Amazon Storage Fee Calculator works.
01How does Amazon calculate FBA storage fees?
Amazon FBA storage fees are calculated monthly based on the cubic feet of space your inventory occupies: Storage Fee = Cubic Feet per Unit × Number of Units × Monthly Rate per Cubic Foot. The monthly rate depends on the product's size classification (standard or oversize) and the time of year (off-peak Jan–Sep vs. Q4 Oct–Dec).
02What are the Amazon FBA storage fee rates for 2026?
Standard-size products: 0.78/cubic foot per month off-peak (Jan–Sep), 2.40/cubic foot in Q4 (Oct–Dec). Oversize products: 0.56/cubic foot off-peak, 1.40/cubic foot in Q4. These are Amazon's 2026 published rates — verify against Seller Central for the most current figures.
03What is the Amazon long-term storage fee?
Amazon charges a long-term storage fee on inventory that has been at their fulfillment centers for more than 365 days. The fee is the greater of 6.90 per cubic foot or 0.15 per unit, assessed monthly. This is in addition to the regular monthly storage fee.
04Why is the Q4 Amazon storage fee so much higher?
During the October–December peak season, Amazon's warehouses fill up with holiday inventory, reducing available space. Amazon charges approximately 3× the off-peak rate to incentivise sellers to reduce inventory before October and clear it quickly after the peak.
05How do I calculate cubic feet for my FBA product?
Cubic feet = (Length × Width × Height in inches) ÷ 1,728. Amazon measures the outer dimensions of your packaged product. For example, a 12×8×4 inch package = 384 cubic inches ÷ 1,728 = 0.222 cubic feet. This calculator accepts your exact dimensions if you select "Custom" as the size tier.
06What is the difference between standard-size and oversize FBA storage?
Standard-size products are those that meet Amazon's standard dimension and weight thresholds (roughly under 18×14×8 inches and under 20 lbs packaged). Oversize covers everything larger. Standard products have a higher storage rate per cubic foot (0.78 off-peak vs 0.56 for oversize), but oversize products take up far more space per unit.
07How do I avoid Amazon long-term storage fees?
To avoid long-term storage fees: (1) use the FBA Restock Calculator to send only what you can sell in 3–6 months, (2) set up removal orders for slow-moving inventory before the 365-day mark, (3) run promotions or lower prices to accelerate sell-through on aged stock, (4) use Amazon's Manage Inventory Health report to monitor days-of-supply.
08Does Amazon charge storage fees on all FBA inventory?
Yes — Amazon charges monthly storage fees on all units stored at their fulfillment centers, regardless of whether those units are selling. The fee accrues daily and is charged monthly based on the daily average inventory volume during the month.
09How can I reduce my Amazon FBA storage costs?
Key strategies: (1) match shipment quantities to 60–90 days of sales velocity, (2) time arrivals to avoid carrying inventory into October (Q4 rate increase), (3) use a restock calculator to plan replenishment, (4) remove slow-moving SKUs before 365 days, (5) use the per-unit storage cost metric to compare products and prioritise faster-turning items.
10What is the storage fee per cubic foot at Amazon?
Standard-size: 0.78/cuft off-peak, 2.40/cuft Q4. Oversize: 0.56/cuft off-peak, 1.40/cuft Q4. These are the 2026 US Amazon rates. Each marketplace (UK, DE, IN, etc.) has its own rate schedule in local currency.
11How do Amazon storage fees affect FBA profitability?
Storage fees affect profitability in two ways: (1) direct cost — each unit tied up in storage incurs a monthly fee that compounds over time, and (2) opportunity cost — capital tied up in slow-moving inventory cannot be redeployed to faster-selling products. Use the Amazon FBA Profit Calculator to include storage as a per-unit cost in your profitability model.
12Are Amazon storage fees tax-deductible?
In most jurisdictions, Amazon FBA storage fees are a business expense and therefore tax-deductible. Consult a tax professional in your country to confirm the treatment for your specific situation, as rules vary by region and business structure.
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