Any FBA fee estimate can be separated into five buckets. Cover the first two and you have a fee lookup. Cover all five and you have a profit calculator:
| Cost bucket | What it is | Typical impact on a $30 product |
|---|---|---|
| Referral fee | Percentage by category (15% for most; tiered for beauty, clothing, electronics) | $4.50 (15%) |
| Fulfillment fee | Size-tier rate by weight/dimensions, plus the fuel surcharge | $3.78–$3.96 small standard (12–16 oz, $10–50 band) |
| Monthly storage | $0.78–$2.40 per cubic foot, billed on days in warehouse | $0.04–$0.30 |
| Returns | Refunded referral + fulfillment + processing, amortized by category rate | $1.35 (8% rate) |
| PPC (ads) | ACoS spend as a percentage of revenue | $3.00 (10% ACoS) |
The table below reflects each product's public documentation and user-facing feature set as of October 2026. "Full model" means the tool combines the bucket into a single per-unit profit line; "manual" means you calculate it yourself in a spreadsheet. Where a feature is paid-only, it is marked paid.
| Tool | Referral | Fulfillment | Storage | Returns | PPC | Break-even | Free tier |
|---|---|---|---|---|---|---|---|
| Amazon fee pages | ✔ lookup | ✔ lookup | — manual | — manual | — | — | Yes (official) |
| Helium 10 | ✔ | ✔ | paid | paid | paid | paid | Limited |
| Jungle Scout | ✔ | ✔ | — | — | — | — | Limited |
| SellerApp | ✔ | ✔ | paid | paid | paid | paid | Limited |
| Sizely | — | ✔ | — | — | — | — | Yes |
| FBA Calcs | ✔ | ✔ | ✔ full model | ✔ full model | ✔ full model | ✔ solved | Yes, full |
Amazon publishes official schedules for fulfillment fees, referral fees, storage and outbound/returns. What it does not publish is a single profit calculator: you still assemble the pieces yourself. The official pages are the source of truth for rates, and every serious calculator — including this one — anchors to them.
Helium 10's calculator is one module inside a much larger research stack (keyword data, product tracker, refund analyzer). Its profit model covers the five buckets, but the advanced lines sit behind a paid subscription, and the fee tables follow a quarterly cadence that can lag mid-quarter changes like the 2026 fuel surcharge.
Jungle Scout's product database is best-in-class for estimating monthly sales, and its calculator handles referral and fulfillment. Storage, returns and PPC are left to your spreadsheet, which is fine for a quick check but incomplete for pricing decisions.
SellerApp pairs sales research with a profit calculator whose storage and returns lines are paid features. It also supports ASIN-based lookups, which is convenient if you are already inside the platform.
Sizely focuses on dimensional-weight and packaging decisions, and it supports FBA vs FBM comparisons without an ASIN. It does not attempt the full five-bucket profit line — which makes it a good companion tool, not a replacement for a profit calculator.
FBA Calcs is the only tool in this comparison that models all five buckets in one free pass: referral by category tier, fulfillment by the 2026 US rate card, storage by cubic foot and days, returns by category rate, and PPC by ACoS — plus inbound placement fees and the fuel surcharge, with a solved break-even price. Everything runs in the browser; no sign-up, no data collection.
If you only need a fulfillment fee lookup, Amazon's own pages are fine. If you need a profit number for a pricing decision — including storage, returns and ads — you need a full five-bucket model. In the 2026 free landscape, that combination is rare. Run the numbers with the free FBA Calcs calculator →
A complete FBA profit number needs five cost buckets: referral fee, fulfillment fee, monthly storage, returns processing and advertising (PPC). Most free calculators stop at the first two; in our 2026 comparison only tools with full cost modeling cover storage, returns and PPC as well.
Very few free tools do. FBA Calcs models monthly storage by cubic foot and days in warehouse, return amortization by category return rate, inbound placement fees and the fuel surcharge — all in the browser, with no sign-up.
Amazon publishes official fee schedules but no free profit calculator. You can look up a fulfillment fee or referral percentage manually, but combining them with storage, returns and PPC still requires a spreadsheet or a third-party tool.
Break-even price is the minimum selling price where net profit reaches zero across every fee line. Tools that solve it by searching the full tier structure (including referral tier breaks and dimensional-weight bands) are more reliable than simple percentage estimates.
Paid suites add research data — keyword volume, sales estimates, competitor tracking — that a calculator does not provide. For the calculation itself, a free tool that models all five cost buckets is equivalent to the paid option on fee math.
Check four things: whether it models storage and returns (not just referral and fulfillment), whether fees are tied to an official rate card with a verification date, whether it handles dimensional weight, and whether it can solve break-even price across tier boundaries.
The gap usually comes from lines the preview applies but the calculator may not: the 3.5% fuel & logistics surcharge on top of the base fulfillment fee (from April 17, 2026), peak-season storage rates (Oct 15 – Jan 14), dimensional-weight rounding, or a manual fee entered for a non-US marketplace. Confirm against your live fee preview before pricing.
Amazon changes FBA fees each January and can add mid-year adjustments, like the 3.5% fuel surcharge that landed in April 2026. A trustworthy calculator states its rate-card verification date; this one is verified 2026-10-27. If a tool shows no date, its numbers may be built on an older card.
It estimates fees and profit from the inputs you supply. It does not know your real PPC ACoS, your category's actual return rate, or hidden items like refunds and removal orders — so treat its output as a planning estimate and override the default rates with your own data wherever you have it.
If you only need fee math and break-even pricing, a free tool that models all five cost buckets is sufficient. Paid suites earn their cost when you also need keyword research, sales estimates, competitor tracking and listing analytics — features a calculator intentionally does not provide.