Plain answer
Target ROAS and Target CPA are Google's smart-bidding strategies. You name the return or cost per conversion you want, and the algorithm sets every bid to hit it. They work only when fed enough clean conversion data — and a target set too aggressively simply chokes off your traffic.
How Target ROAS and Target CPA actually work
Both are automated bid strategies with one instruction each. Target CPA: "get me conversions at this cost or better." Target ROAS: "get me this much revenue per dollar or better." The algorithm then bids differently on every single auction — more for the searcher it predicts will convert, less or nothing for the one it doesn't.
| Target CPA | Target ROAS | |
|---|---|---|
| The instruction | "Conversions at this cost or better" | "This much revenue per dollar or better" |
| Fits | Lead generation — every conversion worth roughly the same | E-commerce — a $900 order deserves a higher bid than a $30 one |
| Needs | Steady conversion volume | Revenue data flowing back into the platform |
Why do smart-bidding targets fail?
Two usual causes:
- Starved data. The algorithm learns from your conversions, and an account with a handful a month gives it almost nothing — predictions become guesses.
- Impossible targets. Demand a CPA far below what your account has ever achieved and the algorithm doesn't try harder — it bids on fewer auctions. Traffic dries up and the campaign starves politely.
What this means for your ads
Fix conversion tracking before handing bidding to a target — the algorithm can only chase what it can see. Set the first target near your account's real recent numbers, then tighten in steps, the way you'd cool a room a degree at a time. A target is a steering wheel, not a wish: turn it gradually and watch what the traffic does.
Want this handled for you? Bytown fixes tracking first, then sets bidding targets from your account's real numbers instead of wishes.
Bytown launches campaigns across Google, Meta, and LinkedIn from one chat, its intelligence learns your business before it writes a word, and a human marketer reviews everything before a dollar moves. First month is 30% off.
Try Bytown — 30% off