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Amazon FBA Profitability Calculator

Enter your product cost, Amazon fees, PPC spend, and return rate — get true net margin, ROI on inventory, break-even sale price, and a side-by-side FBA vs FBM comparison.

Where this fits

📦 Business & Seller OpsSeller OSSellersFounders

This tool lives inside Seller OS and is most useful for sellers and founders.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr

Net Profit / Unit

$11.29

Net Margin

37.7%

ROI on Inventory

167.3%

Monthly Profit

$1,693.92

Recommendation

FBM — FBM saves $3.45 per unit — viable if you can self-fulfill reliably

Product & FBA Inputs

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FBM Comparison Inputs

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hrs
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FBA vs FBM — Unit Economics

Line ItemFBAFBM
Sale Price$29.99$29.99
COGS($6.00)($6.00)
Referral Fee($4.50)N/A
FBA / Outbound Shipping($3.22)($5.50)
Inbound Shipping($0.75)—
Storage / Packaging($0.30)($0.75)
PPC / Labor($3.00)($3.00)
Returns($0.93)—
Net Profit$11.29$14.74
Net Margin37.7%49.1%
ROI167.3%245.7%

Monthly P&L (150 units)

Revenue$4,498.50
Referral Fees($674.78)
FBA Fulfillment Fees($483.00)
Storage Fees($45.00)
PPC Advertising($449.85)
Return Costs($139.45)
COGS($900.00)
Inbound Shipping($112.50)
Net Profit$1,693.92
Annual projection$20,327.04
Seller playbook · Scale, not just survival

FBM is currently protecting more margin than FBA.

At 150 units per month, this product is tracking toward $1,693.92 in monthly profit and $20,327.04 annualized. FBA margin is 37.7%, ROI on landed capital is 167.3%, and your current sale price is $15.68 above break-even.

What To Do Next

Lean on FBM while you fix the size-tier, PPC, or return issues that are making FBA too expensive.

You have $15.68 of room above break-even. Decide in advance how much of that cushion you are willing to spend on growth.

Compare this product with your next best alternative before tying up more inventory capital.

Recommendation

FBM

FBM saves $3.45 per unit — viable if you can self-fulfill reliably

Net margin

37.7%

$11.29 per unit after all modeled costs

ROI on inventory

167.3%

Capital efficiency on landed cost

Price cushion

$15.68

Break-even price $14.31

Build Your Seller Stack

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Amazon Seller Fee Calculator

Calculate your true Amazon profit before listing. Enter product category, sale price, weight, dimensions, and COGS to get a full FBA or FBM fee breakdown — referral fee, fulfillment fee, storage fee — plus net profit per unit, monthly profit, annual profit, margin %, and breakeven price.

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Inventory Reorder Point Calculator

Know when to reorder, how much to buy, and how much cash the next PO needs. Includes safety stock, days of cover, and a suggested order quantity.

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1

Referral Fee

= $4.50

Amazon charges a referral fee (% of sale price) varying by category. Typical range: 8–15% for most; 45% for Amazon Device Accessories.

2

FBA Fulfillment Fee

= $3.22

Pick-and-pack fee covers storage retrieval, packing, and shipping. Standard non-media items: $3.06–$7.00+ depending on size/weight.

3

Storage Cost per Unit

= $0.30

Amazon charges per cubic foot per month. Jan–Sep: $0.78/cf; Oct–Dec: $2.40/cf. Spread across units sold.

4

PPC Advertising Cost

= $3.00

Pay-Per-Click spend as % of revenue. Competitive categories: 8–20%. Organic rank reduces this over time.

5

Return Cost (Blended)

= $0.93

When a buyer returns, Amazon refunds the buyer and you absorb the loss plus a return processing fee. Blended across all units sold.

6

Total Fees Per Unit

= $11.95

The full Amazon fee stack. Every fee is a fixed cost that makes raising your sale price more effective than cutting COGS.

7

Net Profit Per Unit

= $11.29

What you actually keep after Amazon takes its cut and you recover your investment.

8

Net Margin

= 37.7%

Healthy FBA margin: 20–30%+. Below 15% leaves little room for fee increases, returns spikes, or price competition.

9

ROI on Inventory

= 167.3%

ROI measures capital efficiency. Target 50%+ for FBA. Low ROI means slow inventory turns or too much working capital tied up.

10

Break-Even Sale Price

= $14.31

The minimum price at which you break even. Price cushion = sale price − break-even. Tight cushion = high sensitivity to fee changes.

11

Monthly Net Profit

= $1,693.92

Total monthly take-home after all fees, COGS, and advertising across your sales volume.

12

Annual ROI on Capital

= 2007.6%

Annual return on inventory investment. Healthy target: 100%+ (double your money annually). Below 50% suggests the capital could work harder elsewhere.

#ShowYourWork

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