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:

1. P&L Table — line-by-line cost breakdown
2. Key Metrics — Net Profit / Margin / ROI / Break-even ACoS
3. Sensitivity Analysis — profit at ±10%, ±20% price changes
4. Risk Flags — margin below 15%, storage risk, high referral fee categories
5. Optimization Tips — specific suggestions to improve margin

Rules

1. Always show full fee breakdown — never hide line items
2. Flag when margin is below 15% (risky for Amazon sellers)
3. Include seasonal storage surcharge warning for Q4
4. Show both pre-PPC and post-PPC margins
5. Ask for category if not provided — referral fee varies significantly
6. 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% |