Profit Margin & ROI Calculator
Enter your price and costs to see profit, margin, markup and ROI together — plus your break-even price. Works for Amazon, Etsy, Walmart or your own store. Fill in what you have; it updates as you type.
Your results
Enter a selling price and your costs to see profit, margin, markup and ROI.
Margin vs markup vs ROI: the difference
Three numbers come from the same profit, divided by something different each time:
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Profit margin Profit ÷ selling price. The share of the sale you keep. $10 profit on a $40 sale is a 25% margin.
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Markup Profit ÷ cost. How much you add on top of cost. $10 on a $30 cost is a 33% markup.
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ROI Profit ÷ the money invested (your product cost). How hard your cash works. $10 on $30 invested is a 33% ROI.
The trap: a 50% markup is not a 50% margin. A $20 cost plus 50% markup sells for $30 — but the margin is only 33%, because margin is measured against the selling price. Confusing margin with markup is a classic pricing mistake.
Why margin and markup get confused
Markup is measured from cost, margin from price — so the same markup always shows a smaller margin number:
| Markup | Equivalent margin |
|---|---|
| 25% | 20% |
| 50% | 33% |
| 75% | 43% |
| 100% | 50% |
| 150% | 60% |
If a supplier or competitor says "50% markup", the real margin is 33%. Always confirm which one they mean before you set a price.
What's a healthy margin and ROI?
It depends on your model — rough guideposts for product sellers:
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Margin under 10% Thin — vulnerable to rising costs or fees.
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Margin 10–20% Typical for retail and marketplace selling.
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Margin 20–40%+ Healthy — room for advertising and shocks.
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ROI under 50% Slow to recoup unless volume is high.
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ROI 100%+ Strong — your capital doubles each cycle.
Margin is the health of a sale; ROI is the speed your cash comes back. A high-margin but slow-selling product can tie up more money than a thin-margin fast seller.
How the calculation works
A $50 sale with $30 all-in cost — one sale, three different percentages, which is exactly why it matters which one you mean.
How to improve your margin and ROI
Profit responds to a few levers more than any others:
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Lower your landed cost Negotiate supplier price, freight or order volume — the most direct lever on both margin and ROI.
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Count marketplace fees precisely Underestimated selling fees quietly eat margin. Get the exact figure, then add it as a cost here.
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Raise price where the market allows Even a small increase flows straight to profit.
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Turn inventory over faster Higher velocity lifts ROI without changing your margin at all.
Get exact marketplace fees: Amazon Fee Calculator · Etsy Fee Calculator
Margin, markup & ROI: FAQ
No. Margin is profit ÷ selling price; markup is profit ÷ cost. The same profit always shows a smaller percentage as margin than as markup.
It depends on the model, but 20%+ is generally healthy for product sellers, while under 10% is risky once costs or fees move against you.
Margin measures profit against the sale; ROI measures it against the money you invested — and it also reflects how fast that cash returns once you factor in how quickly stock sells.
Only if you enter them as a cost. Work out the exact figure in the relevant fee calculator, then add it here for an accurate margin and ROI.
