The FBA calculator that counts the costs the others skip
Most FBA calculators — including Amazon's own Revenue Calculator — stop at the referral fee and the fulfillment fee. Sellers then meet the rest of the stack on their settlement reports: the 3.5% fuel and logistics surcharge (live since April 2026), holiday peak fulfillment rates, inbound placement fees when Amazon splits your shipment, monthly storage, advertising, and the quiet cost of returns — a refunded sale still leaves you paying 20% of the referral fee as a refund administration fee, plus the product that comes back unsellable. Seller analyses put the gap between a naive calculator and a real settlement at 15–40% of profit. This calculator puts every one of those lines on the page, labelled with its basis, so the number you plan with is the number you keep.
The fulfillment fee comes from your package's size tier and billed weight — the greater of actual weight and dimensional weight (L×W×H ÷ 139). Expected returns cost spreads each refund's losses — refund admin fee, returns processing where it applies, and the unsellable share of product cost — across every unit sold.
Worked example
A $29.99 kitchen gadget in an 8×4×4 in box weighing 12 oz bills at its DIM weight of 0.92 lb as Large Standard — not the small tier its weight alone suggests. At the defaults on this page — with the peak-season toggles on, as they are today — it nets about $6.85 a unit after every cost. Drop the box to 0.75 in thick and the same product can qualify as Small Standard; the Dimensional Weight Calculator shows what box changes are worth.
How to use this calculator
- Enter your selling price and pick the category — tiered categories (Clothing, Beauty, Grocery, Jewelry…) apply their real band rules, including the clothing cliff where a $20.01 item pays 17% on the whole price.
- Measure your packaged product exactly. Amazon bills from its own measurements, and an inch of extra box can move you a whole tier.
- Add your true per-unit costs: product, freight to Amazon, prep, packaging, and your placement and storage reality.
- Set your ad spend and refund rate honestly — they are the two lines sellers most often leave at zero and regret.
- Read the break-even price: below it, every sale loses money no matter how many you sell.
Six FBA fee mistakes that quietly eat margin
1. Measuring the product instead of the package. Amazon tiers and weighs the packaged unit, and bills the greater of its actual weight and its dimensional weight (length × width × height ÷ 139). A light product in a generous box bills as a heavy one. The size tiers turn on small differences: Small Standard tops out at 15 × 12 × 0.75 inches and 16 oz; Large Standard at 18 × 14 × 8 inches and 20 lb. A box that comes in just over a threshold pays the next tier's fee on every unit, all year.
2. Ignoring the price bands. Since 2025 the fulfillment fee also depends on the item's price band — under $10, $10–$50, over $50 — and items under $10 qualify for reduced Low-Price FBA rates. A price change of a few cents across the $10 line changes the fulfillment fee as well as the referral fee, in opposite directions. Model both sides before you reprice.
3. Forgetting that a refund is not a full reversal. When a customer is refunded, Amazon returns the referral fee minus a refund administration fee — 20% of the referral fee, capped at $5. The fulfillment fee you already paid is not refunded, and if the unit comes back unsellable you lose the product cost as well. The calculator's returns fields exist because a 10% return rate is a fee line, not a footnote.
4. Letting inventory age past 181 days. Monthly storage is only the first storage charge. Units that sit in a fulfillment center for more than 180 days pick up an aged inventory surcharge on top — starting at $0.50 per cubic foot per month and rising steeply the longer stock sits (past 455 days it reaches $7.90 per cubic foot, or $0.35 per unit, whichever is greater). Slow stock does not just tie up cash; its carrying cost per unit climbs every month it stays.
5. Planning Q4 with January storage numbers. Standard-size storage costs $0.78 per cubic foot per month from January to September and $2.40 from October to December — just over three times as much — in the same weeks the holiday peak fulfillment rates apply (15 October to 14 January). Inventory built up early for the holidays is stored at the expensive rate while it waits.
6. Shipping everything to one center without checking the placement fee. When Amazon splits an inbound shipment across fulfillment centers, the per-unit placement fee applies; sending to a single location can cost more in freight instead. Neither is always cheaper — the calculator takes the placement fee as a per-unit input precisely so you can compare it against your freight quote rather than discovering it on the settlement.
The 2026 fee schedule used here
Referral rates follow Amazon's published table (unchanged for 2026), including the $0.30 minimum and the tiered categories. Fulfillment rates are the 2026 non-peak schedule with the three price bands (under $10, $10–$50, over $50); the 3.5% fuel surcharge and the holiday peak average of +$0.32 per unit (15 Oct 2026 – 14 Jan 2027) are separate toggles so you can model either season. Storage is $0.78 per cubic foot per month January–September and $2.40 in Q4 for standard-size items (oversize: $0.56 / $1.40). Published transcriptions of the fulfillment card disagree by a few cents at some weights and tiers, so treat every figure as a planning estimate and check your own settlement for the final word — Amazon's measured tier always governs.
Amazon referral fees by category
The referral fee is Amazon's commission, and it is the one fee every seller pays — FBA or not. Amazon charges it on the total price the buyer pays, including any shipping and gift-wrap charges (tax excluded), and most categories carry a $0.30 minimum per item. Rates below are Amazon's published US schedule, matching the categories in the calculator above.
| Category | Referral fee | Minimum |
|---|---|---|
| Most categories (Home & Kitchen, Toys, Sports, Office Products, Pet Supplies, Tools, Lawn & Garden…) | 15% | $0.30 |
| Consumer Electronics / Computers | 8% | $0.30 |
| Automotive & Powersports | 12% | $0.30 |
| Beauty, Health & Personal Care | 8% on the first $10, 15% above | $0.30 |
| Baby Products | 8% on the first $10, 15% above | $0.30 |
| Grocery & Gourmet Food | 8% on the first $15, 15% above | $0.30 |
| Clothing & Accessories | 5% up to $15 · 10% from $15–$20 · 17% above $20 | $0.30 |
| Electronics Accessories | 15% on the first $100, 8% above | $0.30 |
| Furniture | 15% on the first $200, 10% above | $0.30 |
| Jewelry | 20% on the first $250, 5% above | $0.30 |
| Watches | 16% on the first $1,500, 3% above | $0.30 |
| Media (Books, DVD, Music, Software, Video) | 15%, plus a $1.80 closing fee per item | — |
| Amazon Device Accessories | 45% | $0.30 |
Three consequences hide in that table. First, the tiered categories mean the effective rate is rarely the headline rate: a $300 jewelry item pays 20% on the first $250 and 5% on the last $50 — $52.50, an effective 17.5%. Second, the $0.30 minimum quietly raises the rate on cheap items: at 15%, the minimum takes over below a $2.00 price, so a $1.50 item pays $0.30 — an effective 20%. Third, media's $1.80 closing fee is charged on top of the 15%, which is why low-priced books and discs run thinner margins than their sticker rate suggests. The category in the calculator sets this fee for you; if your product sits near a tier boundary ($10, $15, $20, $100), test a price on both sides of it.
Source: Amazon's published referral fee schedule (sell.amazon.com/pricing), checked October 2026.
What the referral fee alone takes at common prices
Before fulfillment, storage or ads, here is the referral fee on its own at prices sellers actually use. It is also the fastest way to see the tier boundaries working.
| Selling price | Home & Kitchen (15%) | Consumer Electronics (8%) | Clothing (tiered) | Beauty/Health (tiered) |
|---|---|---|---|---|
| $4.99 | $0.75 | $0.40 | $0.30 (min. applies — 5% would be $0.25) | $0.40 |
| $9.99 | $1.50 | $0.80 | $0.50 | $0.80 |
| $14.99 | $2.25 | $1.20 | $0.75 | $1.55 |
| $19.99 | $3.00 | $1.60 | $2.00 | $2.30 |
| $29.99 | $4.50 | $2.40 | $5.10 | $3.80 |
| $49.99 | $7.50 | $4.00 | $8.50 | $6.80 |
Read the Clothing column slowly: the fee more than doubles between $14.99 and $19.99, and jumps again past $20, because the whole price moves into a higher tier structure — a $19.99 garment pays $2.00 while a $20.01 garment pays about $3.40 (17%). Pricing a clothing item at $19.99 instead of $21.99 gives up $2 of price but saves about $1.74 of fee on every unit ($2.00 instead of $3.74). The calculator's category dropdown applies the same tiers, so you can test both sides of a boundary with your real costs in place.
All figures are the referral fee only, on the item price with no shipping charged, computed from the schedule in the table above. The Beauty/Health column applies 8% to the first $10 and 15% to the remainder.