Glossary/Target ROAS
What is Target ROAS?
Target ROAS is the revenue-to-ad-spend ratio a seller sets as the objective of an automated marketplace campaign, such as Shopee GMV Max or a Target-ROAS keyword campaign. Setting it to 5 instructs the platform to keep bidding for impressions and clicks as long as each baht of ad spend is expected to return at least five baht of attributed sales. It is a bidding instruction, not a profitability guarantee: the ratio is denominated in gross attributed revenue, so whether a given Target ROAS makes money depends entirely on the contribution rate of the products the campaign sells.
01/Formula
Formula
Minimum Target ROAS = break-even ROAS = 1 / contribution rate Target ROAS to keep net margin m = 1 / (contribution rate − m)
Example
A SKU with a 15% contribution rate before ads. Break-even Target ROAS = 1 / 0.15 = 6.67, so set no lower than 7. To keep 10% net after ads: 1 / (0.15 − 0.10) = 20. Set at the platform-suggested 5 instead: true return = 5 × 0.15 = ฿0.75 per ฿1 of spend — a ฿250 loss on every ฿1,000 of ad budget.
02/In detail
How do you set Target ROAS correctly?
Work from the product, not the platform. Compute the contribution rate for the SKUs the campaign will actually promote, invert it to get the break-even ROAS, then add the net margin you intend to keep by using the target-margin form of the formula. Round up rather than down: the platform optimizes toward the target on its own attribution and its own forecast, and both are noisier than they look at the campaign level. Then split campaigns by contribution band. A single Target ROAS across products with 40% and 15% contribution guarantees that one group is over-bid and the other is starved, and the platform has no way of knowing which is which because it cannot see your costs.
Why does a higher Target ROAS reduce spend?
Because the target is a filter on the auction, not an outcome the system can conjure. Raising it tells the platform to bid only where its forecast says the return clears the higher bar, so it declines more impressions, wins fewer clicks, and spends less. The trade is real: higher target, higher efficiency, lower volume. This is the mechanism behind the most common complaint about automated campaigns — that raising Target ROAS “killed the campaign”. It did not; it correctly refused to buy traffic that would not clear the bar you set. If the resulting volume is unacceptable, the honest fix is on the cost side, not the target side.
Does the platform need a learning period?
Yes, and the practical consequence is that a Target ROAS changed every few days never gets measured. Shopee documents that automated campaigns run a learning phase before performance stabilises, and every large ad platform behaves the same way, because the bidder is re-estimating a conversion model on the new constraint. Changing the target restarts that process. The workable cadence is to set a target derived from margin, leave it long enough to accumulate a meaningful number of conversions, and judge it on true ROAS rather than on the first week of noise.
03/Why it matters
The trap, in one paragraph.
Target ROAS is the one ad control that is both easy to change and directly connected to profit, which makes it the highest-leverage number in a marketplace ad account and the most commonly mis-set. Sellers routinely accept a platform-suggested value, or copy one from a competitor, and then interpret the resulting sales growth as evidence the setting was right. Growth is not evidence. A target set below break-even reliably produces growth, because buying revenue at a loss is easy.
Common mistake
Reading Target ROAS as if it were a profit multiple. A Target ROAS of 5 is not “five times my money back”. It is five baht of gross attributed revenue, out of which COGS, commission, payment fees, vouchers, and shipping still have to be paid. Multiply the target by your contribution rate before deciding whether it is ambitious or suicidal.
04/In DataGlass
How Target ROAS is used in DataGlass.
DataGlass derives a per-SKU break-even ROAS from reconstructed order economics and shows it next to the Target ROAS actually configured on the Shopee campaign, so a target set below the line is visible immediately rather than after a month of settlement reports.
05/Sources
- [1] Shopee Ads Thailand — Target ROAS setup and optimization
How Shopee automatic keyword selection and bid adjustment optimize toward a seller-defined ROAS target, including the campaign learning window.
- [2] Shopee Ads Thailand — ROAS definition
Confirms that the ROAS the target is denominated in is ad-attributed sales over ad spend — gross revenue, before any seller cost.