Amazon FBA fee calculator: category-based profit model
1
The listing
What it sells for, what it costs you to land, and which referral rate Amazon charges.
2
The packed unit
Measure the box you ship, not the product. These drive the size tier and the dimensional weight.
3
Your assumptions
The inputs Amazon does not set for you. Each one moves the answer, so none of them defaults to the flattering value.
30 days
4
Size tier and clearance
How close this unit sits to the ceiling of its tier. Crossing one of these is what moves a fee, and it is the same arithmetic behind a mis-tiered charge.
Large Standard
$6.31 fulfillment
Longest side10.00 / 18.00 in56%
Median side8.00 / 14.00 in57%
Shortest side4.00 / 8.00 in50%
Unit weight1.50 / 20.00 lb8%
Billed weight36.8 / 40.0 oz92%
greater of actual and dimensional weight
Tightest constraint is billed weight, with 3.2 oz before this unit moves into the next weight band.
Size tiers
Small Standard
Large Standard (current tier)
Small Bulky
Large Bulky
Extra-Large
How this fee was worked out
Dimensional weight
2.30 lb
Weight band
2.25 to 2.5 lb
Price band
$10 to $50
Base fee
$6.10
Fuel & logistics surcharge (3.5%, from 17 Apr 2026)
+$0.21
Not modelled yet (5)
Apparel rates (separate ladder from non-apparel)
Dangerous goods / hazmat rates
Low-Price FBA (separate, cheaper ladder under a price threshold)
Ships in Product Packaging (SIPP) discounts
Overmax / oversize handling above the Extra-Large ceiling
Net profit per unit
$10.88
PROFITABLE
Healthy margin. Factor in PPC budget before ordering.
Margin
36.3%
ROI
136.0%
Fee take
37.1%
Fee breakdown per unit, from selling price to net profit
Selling price
$29.99
− Referral fee (15.0%)
−$4.50
− Fulfillment fee
−$6.31
− Storage fee (per unit)
−$0.30
− Product cost (COGS)
−$8.00
= Net profit per unit
$10.88
Revenue split (% of selling price)
Product cost26.7%
Referral fee15.0%
FBA fee21.0%
Storage1.0%
Net profit36.3%
Break-even price
$17.19
Where net profit reaches zero, holding your cost and the current fee bands.
Max product cost
$18.88
The most you can pay per unit at this price before the SKU stops making money.
Fee overcharges start in the same arithmetic as the tiers above: when Amazon's recorded dimensions are larger than the unit actually is, it is billed in a higher tier until the record is corrected.
At 100 units a month. These are the per-unit fees this calculator models, multiplied out, rather than a full settlement.
US rate card
What this FBA calculator includes
The figures in this article come from the 2026 US rate table the calculator itself runs on, effective 15 Jan 2026: one source for the page and the tool. Enter a selling price, a landed cost, packed dimensions and weight, and it returns the fulfillment fee, the referral fee, a storage estimate and net profit per unit, in dollars, inches and pounds. Three pieces of 2026 fee mechanics do most of the work, and the calculator applies each one for you.
Small Standard, Large Standard, Small Bulky, Large Bulky and Extra-Large: the tier is detected from your packed dimensions and weight. Dimensional weight is length × width × height ÷ 139, so a roomy box can out-bill a heavy one.
Price bands, applied automatically
Since 15 Jan 2026 the same physical unit carries a different fulfillment fee by what it sells for: Under $10, $10 to $50 and Over $50. The band is read from the price you enter, and an item at exactly $10 takes the $10 to $50 rate.
Fuel surcharge, shown separately
From 17 Apr 2026 a 3.5% fuel and logistics surcharge applies to the fulfillment fee. It is charged on the fee, not on your selling price, and it appears as its own line rather than folded into the total.
The method
How the FBA fulfillment fee is worked out
Three lookups, in this order: size tier, billed weight, price band. The size tier comes first, from your packed dimensions and unit weight, and each tier is a weight ladder rather than one price. Billed weight comes next, as the greater of unit weight and dimensional weight (length × width × height ÷ 139), with two exceptions that bill unit weight alone: Small Standard, and Extra-Large above 150 lb. Your selling price then picks the band, and the fee is read from the cell where the weight ladder and the price band meet.
The boundary
What this calculator does not model
A fee estimate is only as good as its stated edges. The figure above is the non-peak fee for a standard, non-apparel unit, and these charges sit outside it:
Amazon's per-tier, per-month storage rates: the storage line here is a single blended estimate
Inbound placement service fees
The low-inventory-level fee
Returns processing fees
Aged-inventory surcharges
The calculator also names the programme ladders it defers, apparel and dangerous goods among them, beside its result. Confirm the full stack in Seller Central's fee preview before you commit stock.
Fees you already paid
How FBA reimbursements affect your real profit
The dimensional-weight mechanics above are where fee overcharges start. When Amazon's recorded dimensions for a SKU are larger than the physical unit, the unit bills in a higher size tier than it belongs in, and that difference keeps being charged for as long as the record stays uncorrected. Modelling fees protects margin going forward; most sellers are also losing money backwards, to overcharged fees, lost inventory and return discrepancies. Leviathan Recon, our inventory reconciliation platform, rebuilds your unit ledger per FNSKU from reports you export yourself, and our reimbursement recovery service files claims manually inside Amazon's 60-day window.
Common questions
FBA calculator FAQs
Yes. This page calculates in USD using inches and pounds, on Amazon's rate card effective 15 January 2026. Dimensional weight is length × width × height ÷ 139, and the calculator bills whichever is greater, dimensional or actual weight, except on Small Standard and Extra-Large above 150 lb, where Amazon uses unit weight alone. It detects the size tier for you: Small Standard, Large Standard, Small Bulky, Large Bulky and Extra-Large. Both 2026 changes are applied. Fulfillment fees are read from the price band your product falls into, under $10, $10 to $50, or over $50, so the same physical unit can cost different amounts to fulfill depending on what it sells for. The 3.5% fuel and logistics surcharge that starts on 17 April 2026 is calculated on the fulfillment fee and shown as its own line rather than folded into the total. Referral is applied per category, including the rates that change with price. What the page does not model: the separate ladders for apparel and dangerous goods, Low-Price FBA, and Ships in Product Packaging. Confirm your exact fees in Seller Central's Fee Preview.
Yes, each on its own page. Amazon UK is at /fba-calculator/uk, which reads the UK rate card: envelope, parcel and oversize tiers, Low-Price FBA, dimensional weight on the UK divisor, the fuel and logistics surcharge, and storage that rises in the October to December peak. Amazon India is at /fba-calculator/india, which reads the India rate card: price-banded referral including the zero-referral band, the closing fee, pick and pack, and storage. India's weight handling is not priced on that page and it says so beside the result. Each page calculates in that marketplace's own currency and units, and the switcher above the calculator moves between them.
It includes the four costs that decide FBA profitability: the referral fee (category percentage of selling price versus the marketplace minimum), the FBA fulfillment fee (from auto-detected size tier and billable weight), monthly storage cost (cubic volume × blended rate × days stored), and optional PPC spend as a percentage of price. It does not model VAT/GST settlement, peak-season or aged-inventory surcharges, or removal fees. Confirm those in Seller Central before finalising a purchase order.
Amazon's official Revenue Calculator is accurate but requires you to look up one ASIN at a time, per marketplace. This calculator needs no login and no ASIN: you can stress-test a product idea before it exists on Amazon, switch instantly between US, UK, and India fee schedules, and model PPC spend and monthly projections that Amazon's tool does not include. Use this one to shortlist products fast, then validate the finalists against Amazon's live fee preview.
FBA fees are based on size tier and billable weight, whichever is higher between actual weight and dimensional weight (length × width × height ÷ 139 for US in inches; ÷ 5000 for UK and India in cm). Each tier is a weight ladder rather than a single price, so crossing a tier boundary can move the fee sharply. The three marketplaces differ structurally: the US prices by size tier and weight, and from January 2026 also by selling-price band; the UK prices by envelope or parcel tier and then by weight band inside it; India prices by weight band, shipping distance and seller programme tier. This calculator detects your tier automatically but applies simplified per-tier rates, so its fulfillment figure is an estimate rather than a quote.
Target at least 20% net margin after all fees and product cost, before PPC spend. Margins below 15% leave insufficient room for advertising, returns, and fee changes. Use the PPC toggle in this calculator to model your ad spend impact.