Chief Marketplace Officer

Amazon Margin Calculator

See what you actually keep after Amazon takes its cut. Enter your price, cost and volume once, and get monthly net profit, net margin and profit per unit in real numbers.

Business Inputs

Shared starting point for both scenarios

Product Economics

Average sale price

per unit

Monthly units sold

orders / month

COGS

per unit, landed cost

Amazon Costs

Product category

Referral fee

% of sale price

FBA size tier

FBA / fulfillment fee

per unit — override if needed

Referral fee auto fills from your category using 2026 Amazon rates. The FBA figure is a size tier estimate. Both fields are editable, so override either one with the exact figure from your fee preview.

How do you use the Amazon margin calculator?

Enter five numbers and the calculator does the rest. Your sale price, monthly unit volume, landed cost per unit, product category and ad spend. Referral and FBA fees fill in automatically from the category and size tier you pick.

Landed cost is where most sellers understate the number. If you enter only the factory invoice price and leave out freight and duty, your margin will read two to four points higher than it really is.

What counts as a good profit margin on Amazon?

Above 25% net is strong, 15% to 25% is healthy, and under 10% leaves no cushion for a fee change or a returns spike. Helium 10 puts the workable band at 15% to 20% and treats anything under 5% as unsustainable.

Above 25%

Strong

Room to fund ads, discounts and inventory growth.

Push volume, the unit economics can carry it.

15% – 25%

Healthy

Healthy for a well run private label SKU.

Protect it. Watch ad waste and returns monthly.

10% – 15%

Thin

One fee change or undercut hurts.

Attack COGS and ad efficiency before adding volume.

5% – 10%

Fragile

Capital tied up for very little return.

Reprice, renegotiate, or cut the SKU.

Under 5%

Not Viable

Not viable once storage and returns land.

Fix or exit. Volume will not save this.

Margin also moves by category. Electronics runs thin because competition compresses price, while health and personal care and industrial supplies hold wider spreads. Judge your number against your own category, not a blended average.

Which costs does this calculator include, and which does it miss?

It covers the four costs that decide most of your margin: referral fee, FBA fulfillment fee, landed COGS and advertising. It does not cover storage, returns, inbound freight billed separately, or the smaller program fees.

Cost	Included	Note
Referral fee	✅ Yes	Auto fills from category at 2026 rates, editable.
FBA fulfillment fee	✅ Yes	Estimated from size tier, editable per unit.
Landed COGS	✅ Yes	Enter unit cost plus freight and duty.
Advertising	✅ Yes	TACoS percentage or a flat monthly figure.
Monthly storage	❌ No	Varies by season and cubic feet held.
Returns and refunds	❌ No	Add your return rate to COGS to approximate it.
Aged inventory surcharge	❌ No	Only bites on slow moving stock.
Low inventory level fee	❌ No	Triggered by short supply cover on standard size units.

Quick workaround: raise your entered COGS by two to four percent of sale price to stand in for storage and returns. That usually brings the output within a point of the Seller Central figure.

Why does this number not match Seller Central?

Three reasons, in order of how often they show up.

Wrong FBA size tier. Amazon prices from packaged dimensions and dimensional weight, not the bare product. Pull the real fee from your fee preview and type it in.
Landed cost. Factory price alone understates true unit cost, often badly on heavy or bulky goods.
Missing fees. Storage, returns and program fees sit outside this model, so the output reads slightly optimistic by design.

How do you improve an Amazon profit margin?

Six levers, ordered by how fast they move the number.

Lever	Effect	Time to show up
Renegotiate COGS at higher volume	Largest single gain available	One order cycle
Shrink packaging into a lower FBA tier	Cuts fulfillment fee per unit	Next inbound shipment
Test a small price increase	Direct gain if conversion holds	Two to three weeks
Cut wasted ad spend	Lowers TACoS without cutting sales	Two to four weeks
Reduce returns with clearer listings	Recovers margin lost to refunds	One to two months
Clear aged inventory	Removes surcharges, frees capital	One promotion cycle

The common mistake: sellers cut ad spend hard to rescue margin, lose rank, lose organic sales, and end up worse off. Cut waste, not spend.

When should you recalculate your margin?

At six moments: product research, before a purchase order, whenever Amazon changes fees, after a price change, before a promotion, and during any SKU review.

Does paying an agency actually improve net margin?

Only when the growth or the fee savings exceed what the agency costs. The second panel exists to test that rather than assume it.

Enter the retainer, the commission rate and a lift you would consider fair. If the model still shows lower net profit than your current setup, the partnership is not worth it at those terms. Run it with a conservative lift first. If the numbers only work at a 40 percent growth assumption, the case is being made by the assumption, not by the math.

FAQs

How do I calculate my Amazon profit margin?

Subtract landed COGS, the referral fee, the FBA fulfillment fee and ad spend from your sale price. Divide what is left by the sale price and multiply by 100. That percentage is your net margin. The calculator above runs it across a full month of units.

How much does Amazon take from each sale?

Referral fees generally run 8 to 15 percent of the sale price depending on category, and FBA fulfillment adds a flat per unit charge set by size and weight. Combined, Amazon commonly takes 30 to 50 percent of the listing price before goods or ads.

What is a good profit margin for an Amazon seller?

Fifteen to 25 percent net is healthy and above 25 percent is strong. Below 10 percent there is no cushion for a fee increase or a returns spike. Helium 10 treats anything under 5 percent as unsustainable over the long term.

Is FBA or merchant fulfillment better for margin?

FBA usually wins on small, light, fast selling items where the fee is low and Prime placement lifts conversion. Merchant fulfillment tends to win on heavy or oversized goods that sell slowly, where size tier and storage fees erode the spread.

Does this calculator include storage and return costs?

No. It covers referral fees, FBA fulfillment, landed COGS and advertising. Storage, returns, aged inventory surcharges and low inventory fees sit outside the model. Add two to four percent of sale price to your COGS input to approximate them.

Why is my margin different from what Seller Central shows?

Usually a wrong FBA size tier, a landed cost that leaves out freight and duty, or the fees this model does not carry. Pull your exact fulfillment fee from the fee preview and type it in to close most of the gap.