Calculate Your FBA Profit & Fees Instantly
Enter your product details below. Results update in real-time. Switch between Amazon US, UK, and India marketplaces using the tabs.
What Each Fee in the Calculator Means
Every figure in your results comes from Amazon’s official 2025 fee schedules. Here’s exactly what you’re paying for — and how Amazon calculates it.
Referral Fee
A flat percentage of your selling price Amazon charges per sale. Ranges from 6% to 17% depending on category. Deducted automatically before payment.
Fulfillment Fee
Per-unit fee for pick, pack and ship. Based on your size tier and the greater of actual weight or dimensional weight (L × W × H ÷ 139 for US).
Storage Fee
Monthly fee per cubic foot in Amazon’s warehouse. $0.87/cu ft (Apr–Sep), $2.40/cu ft (Oct–Mar) for US. Blended annual average used per unit.
Net Profit & ROI
Selling price minus COGS, all Amazon fees and optional PPC spend. ROI on cost = net profit ÷ COGS × 100. The true measure of whether a product is worth sourcing.
Amazon FBA Size Tiers & Referral Fees — 2025
Exact size tier boundaries and referral fee rates for US, UK and India marketplaces. Used by the calculator above.
| 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 (longest) | 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 |
DIM weight = L × W × H ÷ 139. Amazon uses the greater of actual or dimensional weight.
| Category | Referral Fee | Min. 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 |
| Automotive | 12% | $0.30 |
| Furniture | 15% | $0.30 |
Storage: $0.87/cu ft (Apr–Sep) • $2.40/cu ft (Oct–Mar). Blended avg: ~$1.63/cu ft/mo.
| Size Tier | Max Dimensions | Max Weight | Fee (2025) |
|---|---|---|---|
| Small Envelope | 33 × 23 × 2.5 cm | 100 g | From £1.71 |
| Standard Envelope | 33 × 23 × 2.5 cm | 460 g | From £2.23 |
| Large Envelope | 33 × 23 × 3.2 cm | 900 g | From £2.74 |
| Small Parcel | 35 × 25 × 12 cm | 1 kg | From £3.00 |
| Standard Parcel | 45 × 34 × 26 cm | 12 kg | From £3.74 |
| Large Parcel | 61 × 46 × 46 cm | 23 kg | From £5.21 |
| Extra-Large | > Large Parcel | 31.5 kg | From £10.19 |
UK uses metric dimensions (cm) and weight (g/kg). DIM divisor is 5000 cm³ per kg.
| Category | Referral Fee | Min. Fee |
|---|---|---|
| Most categories | 15% | £0.25 |
| Electronics | 7% | £0.25 |
| Personal Computers | 7% | £0.25 |
| Cameras & Photo | 7% | £0.25 |
| Beauty & Health | 15–8% | £0.25 |
| Clothing & Accessories | 15% | £0.25 |
| Sports & Outdoors | 15% | £0.25 |
Storage: £0.51/cu ft (Jan–Sep) • £1.21/cu ft (Oct–Dec). Blended avg: ~£0.73/cu ft/mo.
| Size Tier | Max Dimensions | Max Weight | Fee (2025) |
|---|---|---|---|
| Standard (0–500 g) | 30 × 15 × 12 cm | 500 g | From ₹27 |
| Standard (500 g–1 kg) | 45 × 34 × 26 cm | 1 kg | From ₹37 |
| Standard (1–2 kg) | 45 × 34 × 26 cm | 2 kg | From ₹57 |
| Advanced (0–5 kg) | 72 × 44 × 44 cm | 5 kg | From ₹76 |
| Advanced (5–12 kg) | 72 × 44 × 44 cm | 12 kg | From ₹115 |
| Heavy & Bulky (>12 kg) | No limit | >12 kg | From ₹195 |
India uses metric dimensions (cm) and weight (g/kg).
| Category | Referral Fee | Min. Fee |
|---|---|---|
| Most categories | 8–15% | ₹5 |
| Electronics | 7% | ₹5 |
| Mobile Phones | 4% | ₹5 |
| Clothing & Accessories | 15% | ₹5 |
| Jewellery | 20% | ₹5 |
| Grocery & Gourmet | 9% | ₹5 |
| Books | 15% | ₹5 |
Storage: approx. ₹20–40 per cubic foot per month depending on season.
How to Improve Your FBA Margins
Based on working with FBA sellers across the US, UK, and India, these are the highest-impact levers on your profitability.
Optimise Your Packaging Dimensions
The difference between Large Standard and Large Bulky is a $3–$5 jump per unit in the US alone. 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.
Target 20%+ Net Margin Before Ads
PPC advertising typically costs 10–25% of revenue. If your net margin before ads is under 15%, you will likely be selling at a loss once ad spend is added. Use the PPC field in the calculator above to model your product at your expected ad spend rate.
Watch Storage Duration — Especially Q4
Amazon’s US storage fees nearly triple from October to March ($2.40 vs $0.87 per cubic foot). Products sitting in FBA warehouses for more than 60 days during peak season can see storage fees erase margins entirely. Model seasonal inventory separately.
Verify Amazon Is Charging the Right Fees
Amazon frequently miscategorises products — applying the wrong size tier or incorrect weight measurements. Fee overcharges are 100% recoverable when caught within the 60-day window. SeahorseDesk checks this daily for every client account.
Factor In Returns and Their Cost
This calculator shows profit on clean sales. FBA products with high return rates carry additional return processing fees. A product with a 15% return rate needs 15% more margin buffer to account for those costs.
Use ROI to Compare Products, Not Margin
Margin shows what you keep per sale. ROI on COGS shows how efficiently you deploy capital. Higher-cost products need higher margins to deliver the same capital efficiency. Compare products using ROI, not just margin %.
The Most Complete Free Amazon FBA Calculator for 2025 Sellers
Why Most FBA Calculators Give You the Wrong Number
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:
- Storage fees — especially for slow-moving inventory in Q4
- Dimensional weight — your product may be charged by DIM weight, not actual weight
- Correct size tier — being in Large Bulky vs Large Standard changes fees by $3–$5 per unit
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.
What the Calculator Does Not Include
For complete accuracy, note this calculator excludes: product returns processing fees, long-term storage fees (180+ days), removal and disposal fees, Amazon Vine program costs, and promotional discounts. These should be modelled separately in your full P&L.
Calculator vs Professional Audit
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.
- → Wrong size tier charges go undetected
- → Incorrect weight measurements persist
- → Fee overcharges compound over time
- → Claims expire after 60 days
- → Daily fee classification check
- → Overcharges identified and claimed
- → All claims filed within 60 days
- → Performance-based — pay only on recovery
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 →Common Questions About Amazon FBA Fees & Profitability
Answers to the questions FBA sellers ask most about fees, margins, and how to read this calculator.
Are Amazon’s Actual Fees Eating More Than the Calculator Shows?
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 on a performance-only basis.