Estimate your FBA fees, net profit per unit, margin %, and monthly revenue in seconds. Updated for Amazon's 2025 fee schedule. No login, no email — completely free.
Enter your product details below. Results update in real-time as you type.
Every figure in your results comes from Amazon's official 2025 fee schedule. Here's exactly what you're paying for — and how Amazon calculates it.
A flat percentage of your selling price Amazon charges per sale. Ranges from 6% to 17% depending on category. Deducted automatically before payment.
Per-unit fee Amazon charges to pick, pack, and ship your product. Based on your size tier and the greater of actual weight or dimensional weight (L×W×H ÷ 139).
Monthly fee per cubic foot occupied in Amazon's warehouse. $0.87/cu ft (Apr–Sep), $2.40/cu ft (Oct–Mar). Allocated per unit based on your average inventory age.
Selling price minus COGS and all Amazon fees. ROI on cost = net profit ÷ COGS × 100. The true measure of whether a product is worth sourcing.
Use this table alongside the calculator to understand exactly which tier your product falls into and how fees are structured.
| Size Tier | Max Dimensions | Max Weight | Fee (2025) |
|---|---|---|---|
| Small Standard | 15×12×0.75 in | 0.75 lb | From $3.22 |
| Large Standard | 18×14×8 in | 20 lb | $4.75 – $6.10+ |
| Large Bulky | 60×30×— in | 70 lb | From $9.73 |
| Extra-Large (0–50 lb) | — | 50 lb | From $26.33 |
| Extra-Large (50–70 lb) | — | 70 lb | From $33.39 |
| Extra-Large (70–150 lb) | — | 150 lb | From $50.22 |
Dimensional weight = L × W × H ÷ 139. Amazon uses the greater of actual or dimensional weight.
| Category | Referral Fee | Min. Referral Fee |
|---|---|---|
| Most categories | 15% | $0.30 |
| Electronics | 8% | $0.30 |
| Personal Computers | 6% | $0.30 |
| Cameras & Photo | 8% | $0.30 |
| Beauty & Health | 17% | $0.30 |
| Clothing & Accessories | 15–17% | $0.30 |
Amazon's referral fees are deducted automatically from every sale before the balance is paid to your account.
Based on working with hundreds of FBA sellers across the US, UK, and India, these are the most impactful levers on your profitability.
The difference between Large Standard and Large Bulky is a $3–$5 jump per unit in fulfillment fees. A 1-inch reduction in packaging can shift your size tier and save thousands per month at volume. Always measure your final poly-bagged or boxed unit, not the product itself.
PPC advertising typically costs 10–25% of revenue for FBA sellers. If your net margin before ads is under 15%, you will be selling at a loss once ad spend is added. Use this calculator to model your product at different price points until you find a margin that absorbs your ad budget.
Amazon's storage fees nearly triple from October to March ($2.40 vs $0.87 per cubic foot). Products that sit in FBA warehouses for more than 60 days during peak season can see storage fees erase margins entirely. Model seasonal inventory separately.
Amazon frequently miscategorises products — applying the wrong size tier or using incorrect weight/dimension measurements. Fee overcharges affect thousands of sellers and are 100% recoverable when caught within the 60-day window. SeahorseDesk checks this daily.
This calculator shows your profit on clean sales. FBA products with high return rates (electronics, clothing) carry additional return processing fees. A product with a 15% return rate needs 15% more margin buffer than this calculator shows to account for those costs.
Profit margin shows what you keep per sale. ROI on COGS shows how efficiently you deploy capital. A product with a 20% margin on a $5 cost ($1 profit) has a 20% ROI. A product with a 15% margin on a $2 cost ($0.30 profit) has a 15% ROI. Higher-cost products need higher margins to deliver the same capital efficiency.
The majority of free Amazon FBA profit calculators online only account for the referral fee and a rough fulfillment estimate. They miss three things that routinely destroy seller margins:
Our calculator accounts for all of these. You enter actual package dimensions and weight, and the calculator determines your precise size tier, applies the dimensional weight check, and allocates realistic storage fees based on your average inventory age.
For complete accuracy, be aware this calculator excludes: PPC advertising spend, product returns processing fees, long-term storage fees (180+ days), removal and disposal fees, Amazon's Vine program costs, and any promotional discounts. These should be modelled separately when building your full P&L.
This calculator tells you what you should be paying in FBA fees based on your inputs. What it cannot tell you is what Amazon is actually charging your account — and for many sellers, those two numbers are not the same.
The calculator is a planning tool. A professional audit is what ensures the fees you're actually paying match what Amazon should be charging you.
Get Free Fee Audit →Answers to the questions FBA sellers ask most about fees, margins, and how to read this calculator.
Fee overcharges — wrong size tier, incorrect weight classification, wrong category — are one of the most common issues we find in seller accounts. They're invisible without a daily audit and 100% recoverable if caught within 60 days. SeahorseDesk audits your account for free and recovers overcharges on a performance-only basis.