Break-Even ACoS Calculator: How High Can Your ACoS Be on Amazon?

Break-even ACoS in 4 inputs

Enter four values per unit and the result appears instantly. The fields are pre-filled with made-up example numbers.

Selling price

$

Default: price without VAT or sales tax. Untick the box if your price includes 20% UK VAT; other rates are set in the “Calculate in detail” block. My price has no VAT/sales tax included (e.g. US)

All costs per unit combined

$

Purchase, shipping, Amazon fees, packaging. Without advertising, without VAT.

Return rate

%

Flat simplification, rather optimistic: profit is reduced by this share.

Desired profit after advertising

%

As a percentage of the price.

Quick result

Break-even ACoS

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Target range for your ACoS

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Break-even ROAS

–

Returns are a flat simplification in the quick result (profit × (1 − return rate)). This model is rather optimistic: for fees and unsellable stock on returns, plus cost per click and TACoS, use the “Calculate in detail” block.

Calculate in detail (itemized costs, returns, cost per click, TACoS)

Example values: This block calculates independently of the quick calculator, with its own example numbers, so the results can differ. Replace them with your own. Currency of your choice: the $ sign is only a placeholder, nothing is converted. Fees change: check the current Amazon fees for your category.

1. Selling price

How do you enter the price?

Price incl. VAT / tax (as shown to shoppers) Price excl. VAT / tax

Referral fee and ACoS refer to the price you enter here. In the Amazon advertising console, ACoS is usually shown on the price including VAT in countries with VAT. Check this in your console. No VAT on your price? Choose “excl. VAT” or set the rate to 0.

Selling price

$

VAT rate

%

Used to calculate net revenue. Example with 19% VAT; enter your rate (UK 20%, ES 21%, FR 20%, IT 22%).

2. Costs per unit (before advertising)

Cost of goods

$

Purchase or production cost per unit.

Shipping to the Amazon warehouse (inbound)

$

Per unit.

Amazon referral fee

%

Example value. Check the current Amazon fees for your category.

FBA fee

$

Example value. Check the current Amazon fees for your product.

Other costs

$

For example packaging, prep or storage, per unit.

3. Returns

Return rate

%

Share of sold units that come back.

Of these, not sellable again

%

Share of returns you can no longer sell.

4. Goal and advertising data

Desired profit after advertising

%

As a percentage of the price. This gives your profit-goal ACoS.

Conversion rate (optional)

%

Share of clicks that lead to an order. Used for the maximum cost per click.

Current ACoS (optional)

%

Shows your profit or loss per sale after advertising.

Current TACoS (optional)

%

Ad spend relative to total sales.

Reset example values Clear all fields

Detailed result

Break-even ACoS

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Suggested target range for your ACoS (profit-goal ACoS to break-even)

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Profit before ads per unit

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Margin before ads

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Break-even ROAS

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Maximum cost per click (break-even)

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Cost per click at profit goal

–

Important

Break-even ACoS is only a starting point: inventory, season, launch phase, TACoS and conversion change what a sensible target ACoS is for you.

How it is calculated

Quick calculator

1. Net price = price ÷ 1.20 (UK VAT of 20%) if the box is unticked. By default the box is ticked (price without VAT or sales tax, as in the US) and nothing is deducted.
2. Profit before ads = (net price − costs per unit) × (1 − return rate). Returns are a flat simplification: profit is reduced by the return rate. This model is rather optimistic (fees and unsellable stock on returns are missing).
3. Break-even ACoS = profit before ads ÷ the price you entered.
4. Target range = break-even ACoS − desired profit after ads (in % of the price) up to break-even ACoS.
5. Break-even ROAS = 1 ÷ break-even ACoS.

Calculate in detail

1. Net price = price ÷ (1 + VAT rate). If you enter the price without VAT, the net price equals the price.
2. Profit before ads = net price × (1 − return rate) − referral fee × (1 − return rate) − (cost of goods + inbound) × (1 − return rate + return rate × unsellable share) − FBA fee − other costs. The referral fee is fee % × the price you entered.
3. Margin before ads = profit before ads ÷ the price you entered.
4. Break-even ACoS = profit before ads ÷ the price you entered. It equals the margin before ads.
5. Break-even ROAS = 1 ÷ break-even ACoS.
6. Profit-goal ACoS = break-even ACoS − desired profit after ads (in % of the price). Your target range runs from the profit-goal ACoS up to the break-even ACoS.
7. Maximum cost per click = price × break-even ACoS × conversion rate. That is the profit before ads per order times the conversion rate. Using the profit-goal ACoS instead of break-even gives the cost per click at your profit goal.
8. Result per sale after ads = profit before ads − price × current ACoS.
9. Profit after ads relative to total sales = margin before ads − TACoS. The share of ad sales in total sales is TACoS ÷ ACoS.

Simplified assumptions: when an item is returned, the revenue is refunded and the referral fee is credited back (minus a refund processing fee, which is not calculated here), while the FBA fee still applies. Unsellable returns are lost; sellable returns go back into stock. How Amazon actually settles returns for you may differ. The breakdown shows your numbers live:

Privacy: the calculation runs entirely in your browser. The calculator stores nothing and sends no entries to a server.

Which numbers to look at besides your target ACoS

The calculator gives you a limit, not an instruction. Where your target ACoS should really sit depends on more than your margin. The examples below use made-up numbers so you can see the logic. Plug in your own values. The basics of the formula are in the article Calculate, Understand and Reduce Amazon ACoS. Why you should calculate per product is explained in Good ACoS, Still Losing Money?

Returns: the margin on paper is not the margin in your account

A return does not only cost you the revenue. If the item cannot be sold again, the purchase cost is lost too, and the FBA fee usually stays. Example numbers: price $30.00, cost of goods $8.00, 15% referral fee, $4.00 FBA fee, all calculated without VAT. Without returns you keep $13.50 profit before ads, and the break-even ACoS is 45.0%. With 10% returns, of which 30% cannot be sold again, that drops to $11.51 and 38.4%. If you forget returns, you bid toward a limit that has already shrunk.

TACoS and the organic effect: advertising works beyond ad sales

ACoS only sees the sales that advertising brings directly. Good advertising can also support organic sales. That is exactly what TACoS shows: ad spend relative to total sales. Example numbers: a product has a 28.6% margin before ads. At a TACoS of 12%, 16.6% of total sales remain as profit after ads. If ACoS is 25% at the same time, roughly half (48%) of sales come through ads and the rest organically. The organic effect is never guaranteed, though. Watch the TACoS trend over several weeks before you deliberately allow a higher ACoS. More in the article TACoS explained.

Inventory and days of cover: selling what you cannot deliver

A low target ACoS saves money, a high one brings sales. Both are bad if your inventory does not fit. Example numbers: if your stock lasts three more weeks at the current sales speed and replenishment takes six, it is smarter to pull back advertising than to bid up to break-even. A stock-out often costs ranking, which is more expensive than a few lost orders. The opposite applies with a lot of stock: then it can make sense to set the target ACoS closer to break-even, as long as storage and capital costs argue for it.

Season: cost per click and conversion move together

Before a peak season, cost per click and conversion often rise at the same time. Your maximum cost per click is the profit per order times the conversion rate. Example numbers: for the example product in the “Calculate in detail” block ($8.58 profit before ads), the maximum cost per click at 10% conversion is $0.86. In season at 14% conversion it is $1.20, and off-season at 6% only $0.51. A target ACoS that fits in December can be too high in February.

Campaign goal: launch, clearance or profit

The target range in the calculator runs from the profit-goal ACoS up to the break-even ACoS. Where you sit within it is a decision. During a launch you can even run above break-even for a limited time to build sales history. Set a limit for budget and duration. For clearance, your goal is closer to just below break-even, so the stock moves and something is still left over. If profit is your goal, stay at the lower end of the range, at the profit-goal ACoS.

Conversion rate: how many clicks do you need per order?

Break-even ACoS says nothing about whether your cost per click fits. Conversion decides that. Example numbers: at 10% conversion you need ten clicks per order on average. If a click costs $0.60, that is $6.00 of ad spend per order. With $8.58 profit before ads, $2.58 remains. If conversion drops to 6%, ad spend is $10.00 and you lose $1.42 per order, although the cost per click has not changed. So check your offer, images, price and reviews first before you only turn the bid dial.

How Sellantica helps with this

You use the calculator once per product. In daily business, prices, costs and returns keep changing. That is why Sellantica keeps the calculation running: you store your product costs and connect your Seller Central account, and optimization can aim at profit, not just at ACoS. Without product costs on file, Sellantica cannot calculate profit. The product P&L per ASIN shows what is left after costs and advertising, and FBA and FBM inventory planning shows your days of cover.

You decide how much control to keep: Sellantica makes suggestions with reasoning that you approve. Alternatively, the autopilot works with a safety net. In both cases, break-even ACoS stays your orientation, not your dogma.

Frequently asked questions about break-even ACoS