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.
Then add the terms of a managed partnership further down and run the same figures against them, so you can see whether paying for growth clears its own cost or eats the margin.
Referral rates follow Amazon’s 2026 US schedule. Tiered categories are shown at their headline rate — adjust the field if your price sits in a lower band. FBA is a size-tier estimate and drops the small-item discount automatically under $10.
- Per month
- $0
- Per unit
- $0.00
TACoS is total ad spend as a share of total sales, not just ad-attributed sales.
Fee estimates use 2026 Amazon rate schedules and are for modeling purposes only. Actual fees vary by product, account tier, and program. Not affiliated with or endorsed by Amazon.com, Inc. or its affiliates. Always verify fees in Seller Central before making business decisions.
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.
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.
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. |
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.
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.
At six moments:
- 01 Product research
- 02 Before a purchase order
- 03 Whenever Amazon changes fees
- 04 After a price change
- 05 Before a promotion
- 06 During any SKU review
Only when the growth or the fee savings exceed what the agency costs. The partnership panel above 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.
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