Amazon FBA Pricing: Hit Your Real Margins, Not the Dashboard Ones

Why Amazon's profit estimate misleads

The "Revenue Calculator" inside Seller Central shows margin after:

Sale price
Amazon referral fee (~15%)
FBA fulfillment fee
Storage fee (estimated)

It does NOT account for:

PPC ad spend (often 15-25% of sales for established listings)
Inbound shipping to Amazon's warehouses
Returns and customer service costs
Long-term storage fees (slow movers get whacked)
Removal/disposal fees when products don't sell
PPC for ranking (you can't compete without ads in most categories)
Sales tax and 1099-K reporting overhead

Our FBA Profit calculator includes the ones that matter most for the per-unit decision.

The Iron Triangle: COGS, Fees, ACoS

Three numbers determine whether an FBA product is viable:

COGS + shipping in as a % of sale price → target 25-35%
Amazon fees (referral + FBA) → typically 30-35% on a $25 product
ACoS (ad cost ÷ ad sales) → target under 20% for most categories

If these three add up to over 90%, you have no margin for returns, storage, or any pricing pressure.

Worked example

A $30 product:

COGS: $8 (27%)
Inbound shipping: $1.50 (5%)
FBA fee: $5.25 (17.5%)
Referral fee 15%: $4.50 (15%)
PPC (20% ACoS): $6.00 (20%)
Return loss (3%): $0.45 (1.5%)
Total cost: $25.70 (86%)
Net profit: $4.30 (14% margin, 54% ROI on COGS)

That's a viable product. A common rookie mistake: pricing the same product at $25 thinking they'll undercut competitors. Same costs, $0.70 profit. Not viable.

When to raise prices

Raise prices when:

Your ACoS is consistently under 15% (demand exceeds supply at current price)
You have less than 30 days of inventory left
Competitors are out of stock
Your reviews trend better than peers'

A $1 price increase on a 14% margin product nearly doubles your per-unit profit.

When to cut COGS instead

If your margins are tight, attack COGS before price:

Negotiate with current supplier (always ask for 5-10% discount)
Get quotes from 2-3 backup suppliers
Order in larger quantities (often 20-30% cheaper at 1K vs 100 units)
Switch to sea freight for non-urgent restocks (vs air freight)
Reduce packaging weight to lower FBA fee dimensional weight category

A 10% COGS reduction on the example above adds $0.80 to per-unit profit — same as nearly $1 of pricing power.

Bottom line

Build a model BEFORE you order inventory. If margins look thin at the desktop, they'll be thinner in reality. Our calculator helps but the real risk is the costs you don't think to include.