FBA Profit Calculator Guide 2026: Calculate True Amazon Profit

Q: Is 30% profit margin good for Amazon FBA?

Yes — 30% net margin (after all fees, COGS, and ads) is excellent for Amazon FBA. Most profitable sellers net 15-30%; below 10% is risky.

Q: What fees do FBA sellers pay in 2026?

Referral fee (8-15%), FBA fulfillment fee, monthly storage (Jan-Sep vs Oct-Dec peak rates), removal/disposal fees, and optional advertising. Long-term storage applies to units over 180 days.

Q: Are FBA fees calculated on size or weight?

Both. Amazon uses dimensional weight (length x width x height / 139) and charges based on the larger of actual or dimensional weight, within size tiers.

Last updated: August 8, 2026

Most Amazon sellers do not know their real profit per unit. They look at a $29.99 price, subtract $8 cost, and call it a $22 margin. Then Amazon's fee report arrives and the "profit" shrinks to $4. This guide gives you the exact 2026 fee structure and the formulas to calculate true FBA profit — so you can price with confidence and stop funding Amazon's warehouse with your margin.

1. The Complete FBA Profit Formula

Net Profit = Price − Referral Fee − Fulfillment Fee − Storage Fee − COGS − Shipping − Ads

Every term matters. Miss one — especially storage or ads — and your "profitable" listing can quietly lose money for months.

Cost element	How it is calculated (2026)	Example ($29.99 item)
Referral fee	8-15% of price (most categories 15%)	$4.50
FBA fulfillment	Size/weight tier based	$5.06
Storage	Monthly $/cubic foot	$0.40 (allocated)
COGS	Product + freight-in	$8.00
Inbound shipping	Carrier cost to FBA	$0.80
Advertising	Ad spend / units sold	$1.50
Net profit		$9.73 (32%)

2. 2026 Referral Fee Schedule (by Category)

Category	Referral fee	Min fee
Most categories (default)	15%	$0.30
Consumer electronics	8%	$0.30
Furniture	15% (up to $200 then 10%)	$0.30
Clothing & accessories	17% (first $40), 10% above	$0.30
Automotive	12% (parts under $100), 8% above	$0.30

2026 update: Clothing referral fee went up for the low-price band — apparel sellers must re-check margins on items under $40.

3. FBA Fulfillment Fees 2026 (US Small/Standard Size)

Tier	Weight	Fulfillment fee
Small standard	≤ 16 oz	$3.50 - $4.20
Large standard	1 - 2 lb	$5.50 - $6.20
Large standard	2 - 3 lb	$6.50 - $7.30
Large standard	3 - 5 lb	$8.00 - $9.30

Fees are dimensional-weight based: dimensional weight = (L × W × H) / 139. Amazon charges the greater of actual or dimensional weight. Oversized items jump to $9.50+ and can kill low-margin products — always model before sourcing.

4. Storage Fees: The Hidden Margin Killer

Monthly storage is charged per cubic foot. 2026 rates:

Period	Standard size	Oversize
Jan - Sep	$0.87 / cu ft	$0.56 / cu ft
Oct - Dec (peak)	$2.40 / cu ft	$1.40 / cu ft
Long-term (180+ days)	+$6.90 / cu ft or $0.15/unit	+$9.60 / cu ft

Warning: Peak storage fees triple. Inventory that sat all summer becomes a Q4 tax. Use inventory forecasting to keep turns above 3x/year.

5. Step-by-Step: Calculate Your True Profit

Get the exact fee: use Amazon's fee preview or our FBA fees calculator.
Add COGS including freight-in (import duty if applicable).
Allocate storage: estimate cubic feet per unit × monthly rate ÷ expected monthly sales.
Add per-unit ad cost from the last 30 days (spend / units sold).
Subtract everything from price. Target net margin ≥ 25% for sustainable growth.

6. Common Profit Calculation Mistakes

Forgetting peak-season storage spikes.
Using actual weight when dimensional weight applies.
Ignoring removal/disposal fees for stranded inventory.
Excluding ad spend per unit (ACoS contribution).
Not updating fees after Amazon's quarterly changes.

7. Tools to Track Profit Automatically

FBA Profit Calculator — per-unit profit model with live fee schedule.
Amazon Fees Calculator — referral + fulfillment + storage in one view.
Profit Dashboard — track net margin across your catalog over time.

Related reading: FBA Prep Guide (avoid rejection fees), Cost Tracking Guide.

Frequently Asked Questions

How do I calculate FBA profit?

Profit = selling price - referral fee - FBA fulfillment fee - storage fee - COGS - shipping cost - advertising spend. Use a profit calculator for exact numbers per unit.

What percentage does Amazon take from FBA sellers?

Referral fees are 8-15% (most categories 15%), plus FBA fulfillment fees of roughly $3.50-$9.00 per unit, plus monthly storage fees.

Is 30% profit margin good for Amazon FBA?

Yes — 30% net margin is excellent. Most profitable sellers net 15-30%; below 10% is risky.

What fees do FBA sellers pay in 2026?

Referral fee, FBA fulfillment fee, monthly storage (peak rates Oct-Dec), removal/disposal fees, and optional advertising. Long-term storage applies to units over 180 days.

Are FBA fees calculated on size or weight?

Both. Amazon uses dimensional weight (L x W x H / 139) and charges based on the larger of actual or dimensional weight, within size tiers.

Calculate your true margin now: FBA Profit Calculator