Questions we actually get asked
Every answer starts the same way: what to check before you change anything, then the approaches worth considering. No single “correct fix” — because there rarely is one.
tCPA Campaigns22
How many conversions is the campaign getting per week? Google's own rule of thumb is around 30 conversions in 30 days as the minimum for tCPA to learn reliably. Below that, "Learning" can drag on indefinitely — that's not a glitch, it's just not enough data yet.
Read moreCompare your target CPA to your actual CPA over the last 30–90 days (while running Maximize Conversions or a target close to current performance). A gap bigger than 20–30% usually means the target has drifted away from reality.
Read moreOver what timeframe is this "consistent"? A 30–40% miss over 7 days and the same miss over 60 days are two very different situations — short-term noise isn't a reason to act.
Read moreWhat's the campaign's current status — is it already flagged "Limited by budget" or still "Learning"? Lowering the target on a campaign that's already constrained is riskier — the effects will stack.
Read moreGoogle's own rule of thumb is that the learning cycle after a meaningful bid/target change takes about 1–2 weeks (7–14 days), during which performance can swing and won't reflect the strategy's real, settled behavior. But that's a time-based rule of thumb — the real deciding factor is how many conversions you've accumulated since the change (see below).
Read moreLook at CPA together with spend, not in isolation — if CPA stayed flat but conversions dropped, spend dropped too. The question is whether the strategy simply "underspent" or whether the budget itself was also cut around the same time.
Read moreBreak CPA down into its two building blocks: CPC (what you pay per click) and conversion rate (what share of clicks convert). CPA rising because CPC rose while conversion rate held steady points to bidding/auction dynamics. CPA rising because conversion rate dropped while CPC held steady points to traffic quality or the site itself.
Read moreHow many conversions does the campaign reliably deliver per week/month on Maximize Conversions? At low volume (roughly under 15–30 conversions in 30 days), switching to tCPA risks getting stuck in "Learning" for a long time without a clear payoff.
Read moreWhat's your actual (or expected) target CPA? A sensible minimum daily budget is usually estimated as a multiple of CPA — a common rule of thumb: your daily budget should cover at least 2–4 conversions at target CPA, or you'll accumulate stats too slowly.
Read moreDo both flags actually apply to the same time window? Sometimes one status is current and the other is a holdover from an earlier period that hasn't refreshed in the interface yet.
Read moreAre these "different conversion types" actually different in substance, or just different paths to the same outcome — for example, a sign-up form, a demo booking, and a phone call that all lead to the same kind of qualified lead?
Read moreHow many actual changes have been made to the campaign over the last month? Flip-flopping between statuses is almost always a sign of frequent edits (bids, budget, target, conversion actions, structure), not the algorithm "behaving erratically" on its own.
Read moreWhat does Auction Insights show for your core keywords? Overlap rate, outranking share, and impression share relative to competitors give you an indirect read on how aggressively they're bidding — but Google doesn't reveal a competitor's actual CPA.
Read moreIs the goal (target CPA and conversion type) really identical across the campaigns you're considering merging? If the targets formally match but the campaigns actually serve different products or audiences, merging could blend inconsistent segments into a single optimization.
Read moreDoes your business have clear year-over-year seasonality? Compare the current period not just to last month but to the same period last year, to tell a seasonal effect apart from a structural problem.
Read moreIs this clustering actually a problem, or just a reflection of real demand? If one segment (geo/device/audience) genuinely accounts for the bulk of paying demand in your niche, concentrating there may be correct algorithm behavior, not a distortion.
Read moreCheck the campaign's status in the interface — an explicit "Bid strategy constrained by target" or "Limited by search volume" flag, paired with spend running well under budget, is a direct sign the problem is the target, not a lack of demand in the niche.
Read moreHow long has the campaign been beating target? If it's not a one-off blip but a consistent pattern over several weeks, that's a strong signal of untapped potential, not just statistical noise.
Read moreWhat's the real median (and "tail") gap between click and conversion for this business? Check the Time Lag report in Google Ads (the day-by-day "click to conversion" distribution) — without this number, any judgment about a recent period will be premature.
Read moreWhich direction did the window change — wider or narrower? Widening the window (say, from 30 to 60 days) usually adds previously uncounted conversions retroactively, causing a sudden jump in the historical numbers. Narrowing does the opposite — it retroactively removes conversions that used to count.
Read moreIs there enough total traffic/conversion volume to split it into two halves (test and control) and still get a statistically meaningful read from each? An experiment needs roughly twice the data to reach the same confidence level as a direct change.
Read moreA quick primer: how tCPA compares to other bidding strategies
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