Target ROAS, explained properly.
What is Target ROAS?
Target ROAS (Target Return On Ad Spend) is a Google Ads [Smart Bidding](/ppc-glossary/smart-bidding) strategy. You set a target ratio of revenue to spend, and Google automatically adjusts bids to maximise conversion value at that ratio. For example, a Target ROAS of 500% means you want 5 pounds of revenue for every 1 pound spent on ads. Google then prioritises clicks likely to generate higher-value conversions.
How Target ROAS works
You set a target like 400% ROAS (4 pounds in revenue for every 1 pound spent). Google's machine learning then sets each individual bid in real time, factoring in: - The user's likelihood to convert. - The expected conversion value (some users convert at higher prices than others). - Auction competitiveness. - Historical conversion value patterns. Google aims to hit your target ROAS on average across all conversions. Some conversions will deliver lower ROAS, others higher; the average is the goal.
Target ROAS vs Target CPA
- **[Target CPA](/ppc-glossary/target-cpa):** best when all conversions have the same value, like a lead form submission. - **Target ROAS:** best when conversions have variable values, like ecommerce orders of different sizes. The difference matters: a 500 pound sale and a 50 pound sale should not bid the same way, which is what Target CPA effectively does. Use Target ROAS for ecommerce and value-aware accounts, and Target CPA when conversions are roughly equal in value (lead generation, app installs, sign-ups).
What ROAS should I target?
Start with your current actual ROAS from historical data. Know your break-even ROAS first, which is 1 divided by your product margin. If your margin is 30%, your break-even ROAS is 333%. Set your target above this to remain profitable.
What Target ROAS needs to work
1. **Conversion value tracking.** Smart Bidding cannot optimise for value if you are not tracking it. Most ecommerce platforms send purchase value automatically; lead-gen accounts need to assign values manually. 2. **Sufficient conversion volume.** Google recommends at least 50 conversions in the previous 30 days. Below that, the algorithm cannot stabilise around a value pattern. 3. **Realistic targets.** Setting a 1000% ROAS target on a campaign that historically returns 300% causes underdelivery. Start near your historic average; push down gradually. Our [PPC service](/services/ppc-packages) ensures conversion value tracking is set up correctly before enabling Target ROAS, because the strategy is only as good as the data feeding it.
Take this further
Ready to apply this to your own account? [Book a free discovery call](/discovery-call), or explore our [PPC packages](/services/ppc-packages).
Target ROAS: common questions.
Target ROAS vs Target CPA, which is better?
Target ROAS for ecommerce and value-aware accounts. Target CPA when conversions are roughly equal in value (lead generation, app installs, sign-ups). The difference matters: a 500 pound sale and a 50 pound sale should not bid the same way, which is what Target CPA effectively does.
How do I set the right Target ROAS?
Look at historic ROAS for the campaign over the last 30 to 60 days. Start with Target ROAS close to that historic average. Once Smart Bidding stabilises (after 2 to 4 weeks), gradually increase the target by 10 to 20 per cent at a time.
Why is my Target ROAS not getting volume?
The most common reason is that the target is too high relative to the auction's reality, so Google cannot find enough opportunities at that ROAS. Ease the target down by 10 to 20 per cent. Other causes are insufficient conversion value data, broken tracking, or recent account changes that reset learning.
Can Target ROAS work in lead generation?
Yes, when you assign meaningful conversion values. Different lead types should be worth different amounts (a phone call from a service-area customer might be 200 pounds, a newsletter signup 5 pounds). With value tracking in place, Target ROAS becomes a powerful lever even outside ecommerce.
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