How to use an Amazon FBA calculator
An FBA calculator estimates your true profit after Amazon takes its cut. You enter your sale price, product cost, and shipping details — the calculator returns your fees, margin, and ROI.
Calculate your Amazon FBA fees
See referral fees, fulfillment costs, and your net profit per unit.
This matters because Amazon's fee structure has multiple layers: referral fees, fulfillment fees, storage fees, and potential surcharges. Sellers who skip fee calculations before sourcing often discover their "profitable" product barely breaks even.
Try our free Amazon FBA Calculator — it includes 2026 fee rates for all categories and size tiers.
What the calculator needs from you
Required inputs
| Input | What to enter | Where to find it |
|---|---|---|
| Sale price | Your planned Amazon listing price | Research competitors on Amazon |
| Product cost | What you pay per unit (COGS) | Your supplier invoice |
| Category | Product category on Amazon | Amazon's category tree |
| Weight | Actual product weight (packaged) | Scale or supplier spec sheet |
| Dimensions | Length x Width x Height (packaged) | Measure the shipping-ready package |
| Shipping to Amazon | Cost to get inventory to FBA | Freight forwarder or carrier quote |
Optional inputs that improve accuracy
- Monthly units sold — Estimates storage fees more accurately
- Return rate — Category average is 5-15% (apparel is higher)
- PPC ad spend — If you plan to advertise (most sellers should)
- Prep/labeling costs — If using a third-party prep center
How Amazon FBA fees are calculated
The calculator combines three fee types:
1. Referral fee (8-15% of sale price)
Amazon's commission on every sale. Most categories pay 15%. Electronics pays 8%. Clothing pays 17%. See the full category table.
Example: $30 item in Home & Kitchen → $4.50 referral fee (15%)
2. FBA fulfillment fee ($3-10+ per unit)
Amazon's charge for picking, packing, and shipping your product. Based on size tier and weight.
Standard-size items:
- Small (under 1 lb): $3.06-$3.77
- Medium (1-3 lb): $4.99-$6.28
- Larger standard: $6.28 + $0.38 per additional lb
Oversize items: $9.61+ base, scaling with weight
Full breakdown: FBA fulfillment fee schedule
3. Monthly storage fee
- Jan-Sep: $0.78 per cubic foot
- Oct-Dec: $2.40 per cubic foot (3x peak season rate)
A product measuring 10" x 8" x 6" = 0.28 cubic feet → $0.22/month off-peak, $0.67/month peak.
Dimensional weight trap
Amazon charges based on the greater of actual weight or dimensional weight:
Dimensional weight = (Length x Width x Height) / 139
A 12" x 10" x 8" box weighing 1 lb has a dimensional weight of 6.9 lbs. Amazon charges based on 7 lbs, not 1 lb. This catches sellers who ship lightweight items in oversized packaging.
Step-by-step: Calculate profit on a real product
Let's walk through a $35 kitchen gadget weighing 1.2 lbs (Home & Kitchen category):
Sale price: $35.00
─────────────────────────────────────────────
Referral fee (15%): -$5.25
FBA fulfillment (1.25 lb tier): -$4.99
Monthly storage (est.): -$0.15
─────────────────────────────────────────────
Total Amazon fees: $10.39
─────────────────────────────────────────────
Product cost: -$8.00
Shipping to Amazon: -$1.50
─────────────────────────────────────────────
Net profit: $15.11
Profit margin: 43.2%
ROI: 159%
At $15.11 profit per unit, this product has healthy margins. But factor in returns (~5% in kitchen), PPC spend (~15% of revenue), and the real margin drops to ~25%. Still viable, but tighter than the headline number suggests.
Calculate your Amazon FBA fees
See referral fees, fulfillment costs, and your net profit per unit.
What's a good profit margin for FBA?
| Margin | Assessment | Notes |
|---|---|---|
| 40%+ | Excellent | Room for PPC, returns, and price drops |
| 30-40% | Good | Standard target for most FBA sellers |
| 20-30% | Tight | Works only with high volume and low return rates |
| Under 20% | Risky | One price war or fee increase wipes out profit |
Target 30%+ after all Amazon fees to leave room for:
- PPC advertising (10-25% of revenue for most sellers)
- Returns and refunds (5-15% depending on category)
- Price competition and seasonal fluctuations
- Amazon fee increases (happens annually)
Common calculator mistakes
1. Forgetting shipping to Amazon
Your product cost isn't just the unit price. Add:
- Freight from manufacturer to FBA warehouse
- Customs duties and import fees (if sourcing internationally)
- Prep center fees (if applicable)
A $5 product that costs $3 to ship and prep is really an $8 product.
2. Ignoring dimensional weight
If your package is bigger than it is heavy, Amazon charges by volume, not weight. Always check both and use the larger number.
3. Using off-peak storage rates year-round
Storage triples in Q4. If you stock up for holiday season (which you should), factor in $2.40/cubic foot, not $0.78.
4. Skipping the return rate
Returns cost money — you pay return shipping, potential restocking, and may not be able to resell the item. Budget 5-15% of units returned depending on category.
5. Not accounting for PPC
Most products need Amazon advertising to maintain rank. Budget 10-25% of revenue for PPC. A product that looks profitable at 35% margin becomes borderline at 15% after ad spend.
Amazon's Revenue Calculator vs. third-party tools
Amazon Revenue Calculator
Amazon provides a free Revenue Calculator in Seller Central. It's accurate for current fee rates but:
- Requires an active Seller Central account
- Only calculates one ASIN at a time
- Doesn't include PPC or return estimates
- Interface is clunky
Third-party FBA calculators
Our Amazon FBA Calculator and similar tools offer:
- No Seller Central login required
- Bulk calculations across multiple products
- PPC and return rate estimates
- Side-by-side comparison with other platforms
Use Amazon's official calculator for final verification, and third-party tools for initial product research and quick estimates.
FBA vs. FBM: When the calculator says "don't use FBA"
If your FBA profit margin is under 20%, consider Fulfillment by Merchant (FBM):
FBM saves money when:
- Products are large/heavy (oversize FBA fees are steep)
- Inventory turns slowly (avoiding storage and aged inventory fees)
- You have low-cost shipping options
- Margins are too thin for FBA's fee stack
FBA is worth the premium when:
- Products are small and lightweight (sub-$5 fulfillment fees)
- You want the Prime badge (20-40% conversion boost)
- You sell high volume (time savings compound)
- Products turn quickly (minimal storage costs)
Run both scenarios in the calculator and compare. Sometimes FBM adds $2-3 to your bottom line per unit.
FAQ
How do I calculate Amazon FBA fees?
Add your referral fee (8-15% of sale price by category) + FBA fulfillment fee ($3-10 based on size/weight) + monthly storage fee ($0.78-2.40 per cubic foot). Subtract this total plus your product cost from the sale price to get profit. Use our Amazon FBA Calculator for instant estimates.
What is the Amazon FBA profit calculator?
An Amazon FBA profit calculator is a tool that estimates your net profit after all Amazon fees. You enter your sale price, product cost, category, and product dimensions. The calculator returns your referral fee, fulfillment fee, storage cost, total fees, and profit margin. Our free calculator includes 2026 fee rates.
How do I calculate Amazon FBA revenue?
Revenue on Amazon FBA is your sale price minus all fees: referral fee (8-15%), FBA fulfillment fee ($3-10 per unit), and storage fees. For a $30 product in Home & Kitchen: $30 - $4.50 (referral) - $4.75 (fulfillment) - $0.15 (storage) = $20.60 net revenue. Subtract your product cost for profit.
Is there a free Amazon FBA fee calculator?
Yes. Amazon offers a Revenue Calculator inside Seller Central (requires account). Our Amazon FBA Calculator is free without login and includes 2026 fee rates, profit margin calculation, and category-specific referral fees.
What percentage does Amazon FBA take?
Amazon FBA typically takes 20-30% of your sale price in total fees. This includes the referral fee (8-15% by category), fulfillment fee ($3-10 per unit), and storage costs. The exact percentage depends on your product's size, weight, category, and how quickly it sells.
How do I know if a product is profitable on Amazon FBA?
Run the numbers in an FBA calculator before sourcing. Target 30%+ profit margin after all fees (referral, fulfillment, storage, product cost, shipping). Account for PPC advertising (10-25% of revenue) and returns (5-15% of units). If the margin drops below 20% after these factors, the product is risky.
Next steps
- Calculate your product's profit — Amazon FBA Calculator
- Understand all FBA fees — Complete FBA fee breakdown
- Check your category's referral fee — Referral fees by category
- Optimize your listing — Amazon Listing SEO Checklist
- Create optimized listings — AI Listing Generator for Amazon titles, bullets, and descriptions
Calculate your Amazon FBA fees
See referral fees, fulfillment costs, and your net profit per unit.
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