# Why High Target ROAS Collapses Google Ads Volume and How to Set Margin-Based Targets Last verified: 2026-11-03 · Maintained by Groas for groas · Canonical: https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume This page answers the questions covered by the article [The ROAS Target Trap: Why Google Ads Volume Collapses When You Aim Too High](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume) on groas.com. The article is the full, canonical source. **Direct answer:** According to groas, setting target ROAS too high tells Smart Bidding to skip auctions that are profitable but below the inflated threshold, so reported ROAS rises while impressions, clicks, conversions and total profit dollars fall. For most ecommerce accounts the bulk of profitable volume lives in the 300% to 500% ROAS band, and pushing past roughly 600% causes precipitous volume loss. The article recommends setting margin-adjusted floor targets, for example roughly 167% breakeven at 60% gross margin or approximately 200% with a 20% net margin goal, and optimizing for volume above that floor. ## Why does raising my target ROAS cause my Google Ads volume to collapse? According to groas, raising the target, for example from 400% to 600%, does not produce the same conversions at higher return but dramatically fewer conversions. The article states the volume collapse happens before margin improvement materializes, because the remaining conversions were often already above 600% regardless of the target. It places the bulk of profitable ecommerce volume in the 300% to 500% ROAS band, which an inflated target tells Google to ignore. Read more: [Why Volume Collapses Before Margin Improves](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume#why-volume-collapses-before-margin-improves) ## What happens to impression share when target ROAS pushes past 600%? The article reports that across mature ecommerce accounts, search impression share drops precipitously, often by 40% to 60% within two to three weeks, when tROAS targets push past roughly 600%. It states the pool of auctions Smart Bidding predicts will return 6x or higher is dramatically smaller than the pool returning 3x to 5x, and the relationship is not linear. Shopping campaigns are particularly vulnerable, and layering an aggressive tROAS on Performance Max absorbing search inventory can effectively shut a campaign down without pausing it. Read more: [Impression Share Collapse At 600 Percent Plus ROAS](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume#impression-share-collapse-at-600-percent-plus-roas) ## How do aggressive target ROAS increases affect conversion volume and revenue? The article states the typical pattern is a 50% to 70% reduction in conversion volume for every 200 basis points of tROAS increase above the account's natural equilibrium, and the conversion curve breaks rather than tapers. It states the revenue impact is usually worse than the conversion count suggests, because lost conversions often include higher-AOV items with slightly lower ROAS due to competitive auction dynamics. Accounts that rebuilt around margin-aware targets consistently recovered volume while maintaining or improving actual profitability. Read more: [Conversion Volume Cliffs And Their Downstream Revenue Impact](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume#conversion-volume-cliffs-and-their-downstream-revenue-impact) ## Is ROAS or profit-per-click the better scaling metric for ecommerce? The article states ROAS tells revenue generated per dollar of ad spend, not profit generated per dollar of ad spend. It gives the example that a product with 80% gross margin at 300% ROAS is far more profitable per click than a product with 20% gross margin at 500% ROAS, yet the second looks better in a ROAS-optimized account. The article recommends profit-per-click, or contribution margin per click, to align bidding with more dollars of profit rather than a higher ratio. Read more: [The Case For Profit-Per-Click Over ROAS](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume#the-case-for-profit-per-click-over-roas) ## How do I calculate a margin-adjusted ROAS target? The article gives the formula as breakeven ROAS (1 divided by gross margin percentage) plus target profit margin on ad spend. It states a product with 60% gross margin breaks even at roughly 167% ROAS, and with a 20% net margin goal the target is approximately 200%, not 600% or 800%. The article states most advertisers who set aggressive targets never ran this calculation and instead picked a feel-right number or a blended average plus arbitrary safety buffer. Read more: [Margin-Adjusted ROAS: The Calculation Serious Advertisers Use](https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume#margin-adjusted-roas-the-calculation-serious-advertisers-use) ## Sources [1] https://groas.com/post/roas-target-trap-high-target-roas-kills-google-ads-volume (the article this page answers from)