Amazon FBA Profit Calculator
Calculate true net profit for any Amazon product — accounting for all fees, costs, and ad spend. Know your real margin before you source.
Commands
fba calc # interactive profit calculation
fba calc [price] [cogs] [weight] # quick calculation with known values
fba fees # show current FBA fee schedule
fba break-even # calculate break-even ACoS
fba compare [price1] [price2] # compare two price points
fba save [product-name] # save product profile
fba history # show saved products
What Data to Provide
- Sale price — your selling price on Amazon
- COGS — product cost + freight to Amazon warehouse
- Dimensions & weight — for FBA fulfillment fee calculation
- Category — for referral fee %
- Ad spend / ACoS — optional, for true profit with PPC
- Other costs — prep fees, photography, samples
No API keys needed. Works from verbal descriptions or exact numbers.
Fee Structure (2024–2025)
Amazon Referral Fees by Category
| Category | Referral Fee |
|---|---|
| Most categories | 15% |
| Electronics | 8% |
| Clothing & Accessories | 17% |
| Jewelry | 20% (up to $250) |
| Books, Music, Video | 15% |
| Computers | 8% |
| Furniture | 15% (+ $30 min) |
| Automotive | 12% |
FBA Fulfillment Fees (2025 US)
| Size Tier | Weight | Fee |
|---|---|---|
| Small Standard | ≤4 oz | $3.06 |
| Small Standard | 4–8 oz | $3.15 |
| Small Standard | 8–12 oz | $3.24 |
| Large Standard | ≤4 oz | $3.68 |
| Large Standard | 1 lb | $4.51 |
| Large Standard | 2 lb | $5.22 |
| Large Standard | +1 lb | +$0.38/lb |
| Large Bulky | up to 50 lb | $9.73 + $0.42/lb over 1lb |
Additional Fees to Include
- FBA Storage: $0.78/cubic foot/month (Jan–Sep), $2.40 (Oct–Dec)
- Monthly Storage: estimate based on sell-through rate
- Prep/Labeling: $0.55/unit (Amazon prep service)
- Returns: ~2–5% of revenue depending on category
Calculation Formula
Gross Revenue = Sale Price
- Referral Fee = Sale Price × Referral %
- FBA Fee = Based on size/weight tier
- COGS = Product cost + inbound freight
- PPC Cost = Sale Price × ACoS
- Storage = (Units/month × cubic feet × rate) / units sold
- Other Costs = Prep + photography amortized
─────────────────────────────────────
Net Profit = Revenue - All costs above
Net Margin % = Net Profit / Sale Price × 100
ROI = Net Profit / COGS × 100
Break-even ACoS = Net Margin % (before PPC)
Output Format
Every calculation outputs:
- P&L Table — line-by-line cost breakdown
- Key Metrics — Net Profit / Margin / ROI / Break-even ACoS
- Sensitivity Analysis — profit at ±10%, ±20% price changes
- Risk Flags — margin below 15%, storage risk, high referral fee categories
- Optimization Tips — specific suggestions to improve margin
Rules
- Always show full fee breakdown — never hide line items
- Flag when margin is below 15% (risky for Amazon sellers)
- Include seasonal storage surcharge warning for Q4
- Show both pre-PPC and post-PPC margins
- Ask for category if not provided — referral fee varies significantly
- Note when estimated values are used vs. exact inputs
Benchmarks
| Metric | Healthy | Warning | Danger |
|---|---|---|---|
| Net Margin | >25% | 15–25% | <15% |
| ROI | >50% | 30–50% | <30% |
| Break-even ACoS | >25% | 15–25% | <15% |
| Storage/Revenue | <3% | 3–8% | >8% |