A standard-size FBA sale loses roughly 25–35% of the selling price before you even count your product cost: Amazon takes a 15% referral fee, charges a $3.06–$6.90 fulfillment fee per unit, and adds $0.87 per cubic foot in monthly storage that jumps to $2.40 during Q4. On a $19.99 item, that leaves about $8.78 in net profit before PPC — and most new sellers forget the ads. You can run the exact numbers yourself in our free FBA fee calculator in under 30 seconds, no signup.
Last month a seller told me he thought his $19.99 product was "printing money" at $5 landed cost. He ran the math backward after his first payout and found his real margin was 12%, not the 75% he had in his head. He had forgotten referral, fulfillment, and a 17% PPC bill. This guide breaks down every line item Amazon takes, with the exact 2026 numbers.
Every FBA transaction has three unavoidable costs. They are not optional, and they apply whether you sell one unit a month or ten thousand.
This is Amazon's cut for letting you sell on the platform. It is calculated as a flat percentage of the selling price, taken before anything else. General merchandise, home, kitchen, and toys all sit at 15%. Electronics is lower at 8%, which is why so many sellers flock to it — but the competition there is brutal. Beauty is 20%, and Amazon's own devices run up to 45%. The category preset you pick in a calculator changes your answer by hundreds of dollars a year, so confirm it on Seller Central before you trust an estimate.
This pays for picking, packing, shipping, and customer service. For standard-size items weighing 4 to 12 ounces, the fee lands in that $3.06–$6.90 band. Larger, heavier, or bulky items climb fast. The trap most new sellers hit is dimensional weight: a light but oversize box gets charged on its volume, not its actual weight. Rounding your package from 11 to 12 inches can push you into the next tier and nearly double the fee. Re-measure your real shipping box, not the product itself.
If your inventory sits in an Amazon warehouse, you pay for the space it occupies. For most of the year this is $0.87 per cubic foot, easy to ignore. But from October through December, the rate jumps to $2.40 per cubic foot, and aged-inventory surcharges apply to anything over 181 days. Sellers who overstock for a holiday rush and get it wrong sometimes pay more in storage than they make in profit.
| Fee component | Typical amount (2026) | What it pays for |
|---|---|---|
| Referral fee | 15% of sale price (8% electronics, 20% beauty) | Platform access and traffic |
| Fulfillment fee | $3.06 – $6.90 per standard unit | Pick, pack, ship, support |
| Monthly storage | $0.87/cu ft ($2.40 in Q4) | Warehouse space |
| PPC ads (separate) | 15–20% of sale price | Visibility in search |
Let's run the numbers from our FBA fee calculator with a real-looking product: a kitchen gadget priced at $19.99, landed cost $5.00 (product + shipping to Amazon), general category at 15% referral, and a $3.22 fulfillment fee for a small 6-ounce item.
That looks great on paper. But now subtract a realistic 17% PPC spend for a new listing — about $3.40 — and the net profit drops to $5.38, a 26.9% margin. Add a 5% return rate and occasional damaged inventory, and you are near the 20% floor most sellers consider break-even for a new product. The base calculator is the starting point, not the verdict.
A free FBA fee calculator is honest about referral, fulfillment, and storage, but four other costs quietly erode your margin:
PPC advertising. Unless you already rank organically, you pay for every click. New listings should plan on 15–20% of price going to ads. A product that looks profitable at 40% margin becomes unprofitable after ads. Budget for it before you order inventory, not after.
Returns and refunds. Amazon's return rate varies wildly by category — apparel can hit 20%+, accessories under 5%. When a customer returns, you pay the outbound shipping and often the return processing fee. Factor 3–8% of revenue into your break-even, depending on your category.
Q4 storage spike. The $0.87 → $2.40 per-cubic-foot jump is real. If you ship a 2-cubic-foot pallet in October and it sits until January, storage alone costs you roughly $14 versus $5. Plan your Q4 shipments so inventory turns fast.
Dimensional weight surprises. That "small" 7-ounce item in a 9×9×4 inch box may actually be billed as medium oversize. Measure the package you will actually ship to Amazon, not the product dimensions on the manufacturer's spec sheet.
Once you know where the fees go, three levers move the needle. First, pick small and light products: every ounce below a tier boundary saves you real fulfillment dollars. Second, keep your listing conversion rate high so PPC clicks actually buy — and that starts with sharp, properly sized product images. A listing with blurry, badly lit photos burns through ad spend faster than any fee, because every click that does not convert is money thrown away. We recommend running your photos through our free image compressor to keep pages loading fast, and using the product photo studio to clean up backgrounds without hiring a photographer. Aim for at least five images: a pure-white main shot, a lifestyle shot, a size reference, and a detail close-up. Third, re-measure and repack: shaving half an inch off your box or mailer is sometimes enough to drop a product back into a cheaper fulfillment tier.
| Tool | Price | Signup | Data privacy |
|---|---|---|---|
| SmartImgKit FBA Calculator | Free | No | Runs in your browser, nothing uploaded |
| Jungle Scout Calculator | $49/month | Required | Cost data sent to their servers |
| Helium 10 Calculator | $39/month | Required | Account login needed |
If you only need a quick profit-and-ROI number before placing a supplier order, the free calculator does the same math in 30 seconds. The paid platforms earn their price on product research and keyword tracking, not on the fee math itself. Once you are scaling to ten SKUs or more, the paid tools' analytics start to justify the monthly cost — but for validating a single new product idea, open the free calculator first.
Most standard-size items pay a 15% referral fee plus a $3.06–$6.90 FBA fulfillment fee, depending on weight and dimensions. Add roughly $0.87 per cubic foot monthly storage, which jumps to $2.40 during Q4.
Experienced sellers target 30%+ net margin after product cost, referral, and fulfillment fees. This buffer covers PPC ads (15–20% of price), returns, and unexpected fees that a base calculator does not include.
No. Any FBA profit calculator gives you base product profit only. Reserve 15–20% of your selling price for Amazon PPC, especially during a new product launch, or your real margin will look far worse than the estimate.
Most often it is dimensional weight: large but light boxes get charged on volume, not actual weight. Rounding a box from 11 to 12 inches can push you into the next size tier and nearly double the fee. Re-measure your package before blaming Amazon.
Yes. SmartImgKit's calculator runs entirely in your browser with no signup, no data upload, and no monthly fee, unlike Jungle Scout ($49/mo) or Helium 10 ($39/mo) which lock the same math behind an account.
Fee figures are 2026 estimates based on standard FBA rate bands published for sellers. Amazon updates fees periodically and exact charges depend on your item's precise size tier and category; always confirm final numbers in Seller Central. This guide is for estimation only and is not accounting advice.