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Free Amazon Seller Calculators
No signup, no spreadsheet. Free calculators for Amazon sellers — use them here, or embed any of them on your own blog or site.
FBA Fee & Profit Calculator
Estimate Amazon's referral fee, FBA fulfillment fee, and net profit per unit from a sale price, category, and weight.
Open calculatorProfit Margin & Break-Even Calculator
Plug in your real costs — COGS, Amazon fees, shipping, prep — and see net profit, margin, ROI, and break-even price.
Open calculatorPPC ACOS & ROAS Calculator
Enter ad spend and ad sales to see ACOS and ROAS instantly, checked against your break-even ACOS.
Open calculatorWhy Sellers Use These Numbers Before They List
The three calculators above cover the math that decides whether a product is worth sourcing in the first place.
Catch fee surprises before you order
Amazon's referral and FBA fulfillment fees vary by category, size tier, and weight. Running the numbers before you commit to inventory avoids margin surprises after the fact.
Know your real break-even price
COGS, shipping, prep, and Amazon fees all eat into margin differently per product. The break-even price tells you the lowest price you can sell at without losing money.
Set a PPC budget you can defend
ACOS and ROAS only mean something next to your break-even ACOS. Knowing that number first keeps ad spend from quietly turning a profitable listing into a loss.
Frequently Asked Questions
What's included in Amazon's referral fee?
The referral fee is Amazon's cut of each sale, charged as a percentage of the item price and set per category — it typically runs 8-15% for most categories, with some categories (like media) running higher. The FBA Fee & Profit Calculator above applies the correct rate automatically based on the category you select.
How is the FBA fulfillment fee calculated?
FBA fulfillment fees are based on a product's size tier and weight, not its price — a light, small item costs less to pick, pack, and ship than a large or heavy one. That's why two products at the same sale price can have very different net profit per unit.
What's a good ACOS for Amazon PPC?
There's no universal target — a "good" ACOS is whatever sits below your break-even ACOS, which depends on your margin. A product with a 40% margin can profitably support a higher ACOS than one with a 15% margin. That's why the ACOS & ROAS Calculator checks your numbers against your own break-even, not a generic benchmark.
Are these calculators really free, with no account required?
Yes — all three run entirely in your browser with no sign-up, no email capture, and no usage limit. They're also embeddable on your own blog or site if you want to share them with your audience.
Go Deeper Than the Math
Calculators tell you if a product's margin works. These help with everything else.
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Full access, no credit card required. No hidden fees. Built to help Amazon sellers grow faster with clarity.
