Amazon FBA Fee Calculator
See your true per-unit FBA profit after referral, fulfillment, storage, and surcharge fees — and exactly how much of each sale Amazon keeps.
Written by Dorothy Ibrahim, 10+ years in banking & finance
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How we calculate this
This calculator stacks up every major FBA cost on one unit — the referral fee, the fulfillment fee with its 3.5% fuel surcharge, seasonal storage, your product cost, inbound shipping, and ads — to show your true profit per unit and exactly what share of each sale Amazon keeps. That take-rate, next to the typical 35–45% range, tells you whether a product can survive on FBA before you scale it.
The formulas
- Referral fee
- max(sale price × referral-fee percentage, $0.30 minimum)Category presets: most categories 15%; electronics, computers, cameras, grocery 8%; clothing 17%; jewelry 20% — verify your category in Seller Central. Amazon applies a $0.30 per-item minimum referral fee, so very low-priced items pay at least $0.30. Category rates are flat approximations; some categories tier by price point.
- Fulfillment fee
- base FBA fulfillment fee × (1 + 3.5% fuel surcharge)Base fees are set by size tier and changed effective 2026-01-15.
- Storage fee per unit
- cubic feet per unit × storage rate × average months in storageStandard-size rates: $0.87/cu ft Jan–Sep, $2.40/cu ft Oct–Dec.
- Profit per unit
- sale price − referral fee − fulfillment fee − storage fee − product cost − inbound shipping − ad cost
- Amazon take-rate
- (referral fee + fulfillment fee + storage fee) ÷ sale price
- Monthly profit
- profit per unit × units sold per month
Worked example
- Say you sell at $35 with a $9 product cost, $1.50 inbound shipping per unit, a 15% referral fee, a $6.50 base fulfillment fee, 0.15 cu ft per unit stored 1.5 months in the Jan–Sep season, 500 units/month, and no ad spend.
- Referral fee = $35 × 15% = $5.25.
- Fulfillment fee = $6.50 × 1.035 = $6.73 (the 3.5% fuel surcharge is added automatically).
- Storage = 0.15 cu ft × $0.87 × 1.5 months = $0.20.
- Profit per unit = $35 − $5.25 − $6.73 − $0.20 − $9 − $1.50 = $12.33, a 35.2% net margin.
- Amazon keeps $5.25 + $6.73 + $0.20 = $12.17, a 34.8% take-rate — at the low end of the typical 35–45% range (rule of thumb).
- At 500 units/month that is about $6,163 of monthly profit.
Rates, benchmarks & sources
- Referral fee (15% default; category presets 8–20%), 3.5% fuel surcharge on fulfillment, storage rates ($0.87/cu ft Jan–Sep, $2.40/cu ft Oct–Dec, standard size), 181-day aged-inventory surcharge, 35-day low-inventory-fee threshold — Amazon Seller Central fee schedules (base FBA fulfillment fees effective 2026-01-15)
- Typical total FBA take of 35–45% of the sale price, with above 50% treated as a red flag; net-margin bands (<10% unprofitable, 10–20% thin, 20–30% workable, >30% healthy) — Rule of thumb
Figures current as of 2026-07-02. See our methodology & editorial standards for how constants are versioned and verified.
What this tool doesn’t model
- Amazon changes FBA fees frequently — base fulfillment fees changed January 15, 2026, and storage and surcharge rates move too; check the current Seller Central fee schedule before pricing a product.
- You supply the base fulfillment fee for your size tier; the tool does not measure or weigh your product, and oversize, apparel, and dangerous-goods tiers differ.
- Models average monthly storage only — the 181+ day aged-inventory surcharge and the low-inventory-level fee (35-day threshold) are flagged as warnings, not priced per unit.
- Excludes returns and refund processing fees, removal/disposal fees, prep and labeling, and Amazon advertising beyond the single ad-spend input.
- Uses one price and one cost — it does not model promotions, coupons, or Subscribe & Save discounts.
Frequently asked questions
How much of each sale does Amazon actually keep on FBA?
Add the referral fee, the fulfillment fee, and storage: that is Amazon’s take before you count your own product cost. As a rule of thumb the total typically lands at 35–45% of the sale price; above 50% is a red flag that the product’s price, size, or category fees do not fit FBA. This calculator shows your exact take-rate for the numbers you enter.
What is the fuel surcharge on the fulfillment fee?
Amazon applies a 3.5% surcharge on top of the base FBA fulfillment fee, so a $6.50 base fee really costs $6.73 per unit. The calculator adds it automatically — you enter only the base fee for your size tier from the Seller Central schedule.
Why is Q4 storage so much more expensive?
Standard-size monthly storage runs $0.87 per cubic foot from January through September but jumps to $2.40 from October through December — roughly 2.8 times the off-season rate. Inventory that sits through Q4 without selling erodes margin fast, which is why sellers try to ship in only what will sell before year-end.
What happens if my inventory sits in FBA too long?
Beyond ordinary monthly storage, Amazon adds aged-inventory surcharges once units pass 181 days in fulfillment centers, and they escalate the longer stock sits. On the other end, keeping stock too thin can trigger a low-inventory-level fee (tied to a 35-day threshold in 2026). The tool warns when your average months in storage suggests aged-inventory exposure.
Are these FBA fees still current?
The constants here reflect the Amazon Seller Central fee schedules as verified for this build, including the base-fee change effective January 15, 2026. Amazon revises fees regularly and by category and size tier, so treat this as an estimate and confirm your exact fees with Amazon’s Revenue Calculator or the current fee schedule before committing inventory.
What net margin is considered healthy for an FBA product?
As a rule of thumb: under 10% net margin is generally unprofitable once returns and overhead land, 10–20% is thin, 20–30% is workable, and above 30% is healthy. These are heuristics for private-label FBA, not Amazon policy — high-velocity or wholesale models can run thinner on purpose.
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themoneysheet provides educational estimates, not financial, tax, or legal advice. Figures use published rates and formulas current as of the date shown, but your situation may differ. Consult a qualified professional (CPA, attorney, or licensed advisor) before making financial decisions.