Is this calculator really free?

Yes, the calculator on this page needs no signup. For automatic analysis from your real inventory, our Lite plan is $10/mo.

Are the rates current?

The default is a typical value and is editable — Amazon rates change seasonally, so we ask you to verify the current rate in Seller Central. We never show invented data.

How do I calculate for Q4?

Just enter the Oct–Dec rate (typically ~$2.40/ft³) in the rate field.

🏬Storage Fee Calculator

Know your storage cost upfront.

Calculate monthly & yearly FBA storage cost from product dimensions and unit count. No signup, editable rates.

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ft³

Volume calc

Months modelled

Tool cost

🏬 FBA Storage Fee Check

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Unit system

Length

Width

Height · Amazon measures the OUTSIDE of the package. The selector above sets inches or cm — the calculation converts to inches either way to get ft³.

Units in storage · Amazon bills monthly storage on your DAILY AVERAGE volume — enter the average units held through the month, not the month-end balance.

Storage rate

Card rates: standard size $0.78 (Jan–Sep) / $2.40 (Oct–Dec), oversize $0.56 / $1.40. ⚠️ These could NOT be verified on Amazon's own page (it is behind a login); some sources say $0.87 rather than $0.78. If you know the rate on your own Fee Preview, switch to manual.

Item class

Batteries, aerosols, flammable liquids, perfume and nail polish count as dangerous goods and are stored in a SEPARATE facility at a SEPARATE rate. That rate is behind Amazon's login; rather than invent it, picking this opens the rate fields so you enter your own.

Units sitting 181+ days (opt.)

How many OF the total above have passed 181 days. Clothing, shoes, jewelry and watches are EXEMPT from this surcharge — leave 0 if that is your category.

Storage utilization surcharge ($/ft³/mo, opt.)

Amazon charges this ON TOP of monthly storage, based on how much volume you send in against how much you sell (your utilization ratio) — so slow-moving stock is penalised twice. The ratio is specific to your account and appears under Seller Central → Inventory → Storage Fees; that is why it defaults to 0 and does NOT enter the total unless you enter it.

ⓘ The default rates are Amazon US per-cubic-foot fees (the fields are editable — enter your own marketplace's rate).

ⓘ Rounding: money lines are rounded to the nearest cent, and the total on screen is the sum of the lines on screen. The marketplace's own rounding can differ by a cent per line; in tiered rate cards the direction of that difference is not guaranteed.

Monthly storage cost (Jan–Sep, surcharges incl.)$52.00

Size tier → standard size (by dimensions): $0.78 / $2.40Volume / unit: 0.222 ft³Per unit / month: $0.17Q4 monthly (Oct–Dec): $160.00

Yearly (9 mo + 3 mo Q4): $948.00

A year is billed 9 months at the low rate + 3 months at the Q4 rate; multiplying the month by 12 understates the year by about a third. Amazon measures the OUTSIDE of the package. The dimensions are within the standard-size limits but the weight is unknown — the item can still be oversize on weight, in which case switch to manual and enter the oversize rate ($0.56 / $1.40). There are fields for the storage UTILIZATION surcharge (driven by how much volume you send in against what you sell) and the 181+ day aged-inventory surcharge; without a rate those lines stay "—" and do NOT enter the total.

Inputs are stored only in your browser, and the link carries the calculation itself.

Full analysis with real data → sign up

10 September 2026 we made a correction to this calculator that changed its results: some fields accepted zero or above-100% values without warning.

The problem

Storage fees quietly eat your margin.

Rates roughly triple in Q4; sellers who don't plan for it lose money.

📦

Volume blindness

You can't estimate fees without knowing your cubic feet.

🎄

Q4 surprise

Oct–Dec rates are much higher; plan inventory accordingly.

🧮

Manual math errors

Inch→ft³ conversion by hand invites mistakes.

Features

Simple inputs, clear output.

📐

Dims to volume

Enter L×W×H inches, ft³ is automatic.

✏️

Editable rate

Enter Amazon's current rate — we don't invent it, you verify it.

📅

Months modelled

Yearly cost as 9 months at the Jan–Sep rate plus 3 months at the Q4 rate — not the month times 12.

⚡

Instant result

Recalculates as you type.

🌙

No signup

The calculator on this page is completely free.

📊

More inside

With an account: automatic storage analysis from your real inventory.

How it works?

1️⃣

Enter dimensions

Product dimensions in inches and units in storage.

2️⃣

Verify the rate

Default is a typical rate; check Amazon for the current one.

3️⃣

See the result

Monthly and yearly cost calculated instantly.

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Profit Calculator

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Frequently Asked Questions

Storage cost known, no surprises.

With an account: automatic storage & aging analysis from your inventory

Calculate Now Create a free account

This calculator is free — no signup needed

Research & Analysis

Know your storage cost upfront.

Storage fees quietly eat your margin.

Volume blindness

Q4 surprise

Manual math errors

Simple inputs, clear output.

Dims to volume

Editable rate

Months modelled

Instant result

No signup

More inside

How it works?

Enter dimensions

Verify the rate

See the result

Related Tools

Frequently Asked Questions

Storage cost known, no surprises.

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