For Amazon FBA Sellers Who Import Products
See your true cost
from factory to customer.
Finally.
Most Amazon sellers overestimate their margins by 30-50%. MarginStack reveals every hidden cost between your supplier's invoice and your actual profit, including duties, freight, and Amazon's cut.
The margin you calculate is not the margin you keep.
Most sellers calculate margin as: Selling Price minus Product Cost minus Amazon Referral Fee. That misses freight, customs duties, brokerage fees, FBA fulfillment, and storage costs. The result? You think you're making 75%. You're actually making 56%.
WHAT MOST SELLERS CALCULATE
3 line items. Looks great. Feels profitable.
WHAT MARGINSTACK SHOWS YOU
$4.78 per unit you didn't know you were losing.
Your complete cost waterfall, in seconds.
Enter your product details. MarginStack calculates duties, freight, and Amazon fees, then shows you exactly where every dollar goes.
Example Product
Silicone Phone Case
Imported from China, sold at $24.99
True Margin
$13.96
55.9%
Full Cost Calculator
Enter your product details and get a complete cost breakdown in seconds. FOB, freight, duties (MFN + Section 301 + IEEPA), Amazon referral, FBA fulfillment, and storage. Nothing hidden.
Open CalculatorCountry Comparison
Compare landed cost across China, Vietnam, India, Mexico, and Thailand side-by-side. See exactly how sourcing country affects your duties, freight, and true margin.
Compare CountriesDuty Stack Explained
Understand exactly how MFN base duties, Section 301 tariffs, IEEPA surcharges, and Section 232 tariffs stack on top of each other. Plain English, no legal jargon.
Learn About DutiesStop guessing. Start calculating.
Your competitors are pricing based on incomplete data. Know your true cost, set your price with confidence.
Calculate Your True MarginFree for your first 5 calculations. No credit card. No signup.