Online selling

Amazon FBA Profit Calculator

FBA fees and storage can erase margin on thin products.

Last updated June 2, 2026

Enter unit economics and monthly volume for net profit.

When to use this calculator

  • You sell on Amazon FBA part time and need net after fees, storage, and PPC.
  • You compare one SKU unit economics before ordering inventory.
  • You weigh FBA against eBay or self-fulfilled resale.

Inputs you need

  • Sale price, landed product cost, inbound shipping per unit.
  • FBA fee percent estimate, monthly units, storage, ad spend.
  • Tax reserve percent.

Expenses people forget

  • Returns and unsellable inventory write-offs.
  • Peak-season storage rate increases.
  • Listing photography and compliance labeling time.
  • Inventory cash tied up before first sale.

Your numbers

Example values are shown so you can see how it works. Replace them with your own.

Estimated net monthly profit
$1,177
  • Gross monthly revenue$4,800
  • Total costs and fees- $3,415
  • Estimated tax reserve- $208
  • Net monthly profit$1,177
  • Profit margin24.5%
  • Annualized net$14,127
Worth testing
Probably worth testing

The margin is workable. Watch fees and returns closely as volume grows, since they scale with you.

Suggested next steps

  1. Re-run with your worst month's costs, not your best.
  2. Track fees and returns separately as volume grows.
  3. Raise price before scaling ad spend.

Estimates only, based on the numbers you enter. Nothing is saved to the page address. Tax figures are rough planning numbers, not filing advice.

Assumptions this calculator makes

  • Revenue and costs are steady monthly averages.
  • Tax reserve is a rough set-aside, not tax advice.

This is an estimate, not advice

Every result here is a rough model based only on the numbers you enter. Sidequity is an informational tool and does not provide professional, tax, legal, investment, or financial advice, and it makes no income guarantees. Any tax set-aside is a planning placeholder, not a tax calculation.

How to interpret the result

Net monthly is what you can plan around.

Thin margin leaves no room for a bad month.

What this calculator does not know

  • Category-specific referral and fulfillment tiers.
  • Long-term storage or removal fees.
  • Multi-SKU catalog complexity.

Common mistakes

  • Ignoring marketplace fees.
  • Forgetting ad spend.
  • Using gross revenue as profit.

Suggested next steps

  • Run with PPC at zero and at your current spend.
  • Read is Amazon FBA worth it for inventory timeline notes.
  • Compare ebay-reselling-profit on the same category.

Estimates only. Not tax, legal, or financial advice.

Frequently asked questions

Is profit guaranteed?

No. This is an estimate from your inputs.

What tax reserve should I use?

A rough planning set-aside, often 20 to 30 percent of profit. Confirm with a tax professional.

Why are margins thin?

Fees, ads, returns, and unit costs stack on every sale.

How do I improve margin?

Raise price, cut input cost, or reduce fees and ad spend.

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Amazon FBA Profit Calculator last updated June 2, 2026. Back to all calculators.