Ad ACoS & ROAS Calculator
Enter your ad spend, the revenue those ads brought in and your profit margin; compute ACoS, ROAS and break-even ACoS in one step, and see the net effect of your Amazon/Trendyol advertising in TL.
Last updated: July 2026Calculation method and sources
The net margin left after commission, shipping and VAT, before ad cost. Verify your exact margin from your own panel.
ACoS
%20
- ROAS
- 5x
- Break-even ACoS
- %25
- Net effect of ads
- +₺125
Your ACoS (%20) is below the break-even ACoS (%25), so this advertising is profitable: after ad cost, roughly +₺125 is left.
ACoS and ROAS are two views of the same ratio: ROAS = 1 / ACoS. Below break-even ACoS the ads add profit; above it they erode it. Verify your exact figures from your own panel.
ACoS, ROAS and break-even ACoS
ACoS and ROAS are the two numbers every marketplace advertiser watches, and they measure the same thing from opposite directions. Both come from just two inputs — ad spend and the revenue those ads brought in:
- ACoS = ad spend / ad revenue × 100. The share of ad revenue eaten by ad cost. Lower is better.
- ROAS = ad revenue / ad spend. How many liras of revenue each lira of spend returns. Higher is better. ROAS = 1 / ACoS.
A concrete example: you spend 500 TL and the ads bring in 2.500 TL. From this:
| Measure | Formula | Result |
|---|---|---|
| ACoS | 500 / 2.500 | %20 |
| ROAS | 2.500 / 500 | 5x |
A %20 ACoS and a 5x ROAS describe the exact same campaign. Neither number alone tells you whether the campaign makes money — for that you need the break-even ACoS.
Break-even ACoS: the line between profit and loss
Break-even ACoS is the ACoS at which the profit from advertising is exactly zero, and it equals your profit margin. If your net margin before ads is %25, then any campaign running at %25 ACoS breaks even. Below that line the ads add profit; above it they eat into the margin and each sale loses money.
The net effect of ads makes this concrete: revenue × margin − spend. With 2.500 TL of ad revenue at a %25 margin and 500 TL of spend, the net effect is 2.500 × 0,25 − 500 = +125 TL. Since the %20 ACoS is below the %25 break-even, the campaign is profitable. Push spend until ACoS climbs past %25 and the same maths turns negative.
Getting the margin right
The whole result hinges on the margin you enter, so use the net margin before ads — what is left after commission, shipping/desi, service fee and VAT, but before the ad cost. Entering a gross margin (only product cost removed) inflates the break-even ACoS and makes a loss-making campaign look profitable. The exact rates and deductions vary by marketplace and category, so verify your true margin from the actual figures in your own panel.
To find that net margin per sale, use the Trendyol profit calculator, and to separate margin from markup take a look at the profit margin calculator.
Frequently Asked Questions
How is ACoS calculated?
ACoS (Advertising Cost of Sales) = ad spend / revenue from ads × 100. For example, if you spend 500 TL and the ads bring in 2,500 TL of revenue, ACoS = 500 / 2,500 = %20. In other words, for every 100 TL of ad revenue you paid 20 TL in ad cost. The lower the ACoS, the more efficiently your ads are working.
What is the difference between ACoS and ROAS?
They are two readings of the same relationship. ACoS divides spend by revenue (spend / revenue), while ROAS divides revenue by spend (revenue / spend). ROAS = 1 / ACoS. A %20 ACoS means a 5x ROAS. For ACoS lower is better, for ROAS higher is better; they express the same performance from two directions.
What does break-even ACoS mean?
Break-even ACoS is the ACoS level at which the profit from ads falls to exactly zero, and it equals your profit margin directly. If your net margin is %25, the break-even ACoS is %25: below %25 the ads add profit, above it they eat the margin and push you into a loss. That is why you should always keep your target ACoS below your margin.
What is a good ACoS rate?
There is no single right number; a good ACoS depends entirely on your profit margin. On a product with a %40 margin, a %30 ACoS is still profitable, while on a %15-margin product a %20 ACoS is already a loss. The rule is clear: as long as ACoS stays below your margin, advertising is profitable. Your benchmark is not the industry average but your own break-even ACoS.
How do I know whether an ad is profitable or loss-making?
Compare your ACoS with the break-even ACoS (your profit margin). If ACoS < margin the ad is profitable and the net profit from ads is positive. If ACoS ≥ margin the ad is loss-making; the ad cost exceeds the margin and every sale comes out of your pocket. This tool gives the net effect of ads (revenue × margin − spend) in TL and shows the direction in colour.
Which figure should I enter as the profit margin?
Enter your net margin before ads: the percentage left per sale after commission, shipping/desi, service fee and VAT, excluding ad cost. If you enter the gross margin (only product cost deducted), the break-even ACoS comes out too high and the ads look more profitable than they are. Verify your exact margin from the actual deductions in your own marketplace panel.
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See ad profitability alongside your real net profit
Verimle deducts commission, shipping, withholding tax and VAT from every sale and shows your real net margin per product and store — the exact margin you need to set an accurate break-even ACoS.
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