Amazon FBA ROI Calculator

Return on every dollar you put into inventory — per unit, per dollar, and annualized by how fast your stock turns. Free, no signup.

Your investment (per unit)
The sale
Your capital's speed

How many times a year a dollar of inventory comes back as cash. Restocking every two months ≈ 6 turns.

Return on investment (per unit)

Landed cost (your investment)
Net profit
Net margin (on price)
ROI (on landed cost)
Cash back per $1 invested
Simple annualized ROI

Annualized = per-unit ROI × turns, ignoring compounding and restock lead time — a comparison yardstick, not a forecast.

Want the full per-unit picture — breakeven ACOS, every fee line, saved records? Use the complete FBA profit calculator. Not sure what your fulfillment fee is? The FBA fee calculator looks it up from Amazon's 2026 rate card.

How FBA ROI is calculated

Landed cost = supplier unit price + freight + prep & labeling

Net profit = sale price − landed cost − referral − fulfillment − storage − ads − returns

ROI = net profit ÷ landed cost

The denominator is what makes ROI the seller's number. Margin tells you how much of the customer's money you keep; ROI tells you what your own money earned. When you're deciding where to put the next $5,000 of inventory budget, ROI is the comparison that matters.

ROI vs. margin: same profit, different question

Both start from the same net profit. Margin divides it by the sale price; ROI divides it by your landed cost. With the default numbers above, a $3.91 profit is a 15.7% margin but a 60% ROI — one deal, two very different-sounding numbers. Neither is wrong; they answer different questions. Compare products with ROI, judge pricing health with margin.

What's a good FBA ROI?

Rules of thumb, not laws: retail-arbitrage and wholesale sellers often demand 100%+ per unit, because their capital cycles quickly and each deal is short-lived. Private-label sellers commonly accept 30–60%, trading a lower per-unit return for volume and durability. The tiebreaker is speed — which is why this calculator annualizes: a 40% ROI turned 6 times a year (~240% simple annual return) beats a 100% ROI turned once. Enter your own turns and let the numbers argue.

Frequently asked questions

How do you calculate ROI for Amazon FBA?

ROI = net profit ÷ landed cost. Landed cost is everything paid to get one sellable unit into Amazon's warehouse: supplier price, freight, prep. Net profit is the sale price minus landed cost and all selling costs.

What is a good ROI for Amazon FBA?

Arbitrage and wholesale sellers often target 100%+; private label commonly runs 30–60%. The honest answer depends on turns — see above.

What is the difference between ROI and profit margin?

Same numerator, different denominator: margin is profit ÷ price, ROI is profit ÷ landed cost. The profit calculator shows both side by side.

Why does annualized ROI matter more than per-unit ROI?

Per-unit ROI ignores time. Multiply by inventory turns to compare products fairly — and to compare Amazon against any other use of the money.