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Metrics type: Key Metrics • Category: Ad Platform
Earliest signal of broken tracking, landing-page regression, or auction-side shift.

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At a glance

Real-time alert that fires when daily conversions fall sharply against a same-day-of-week baseline. The earliest signal of broken pixel-tracking, a landing-page regression, or an auction-side shift. Read this card BEFORE making any “ROAS dropped” decisions, often the conversion drop is measurement, not performance.

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Calculation

Calculated automatically from your Google Ads data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

A UK fashion brand. Tuesday 14 Apr 26, 18:00 local time. The alert fires. Spend was £905 today vs £880 same Tue last week. Clicks were 1,124 today vs 1,080 same Tue last week. So: What this pattern tells the analyst:
  1. Spend and clicks are normal, conversions cratered. This is the textbook signature of a tracking break. If targeting/auction had shifted, clicks or spend would have moved too.
  2. The ROAS card will look catastrophic (1.5x vs 4.2x baseline). The instinct is to pause campaigns. Do NOT pause campaigns yet. Run the diagnostic checklist:
    • Step 1: Pixel check. Open the brand’s checkout success page in incognito, complete a £1 test order, watch Tag Assistant or the GTM debugger for the conversion fire. Most likely cause: a developer pushed a code change to the checkout page yesterday and broke the conversion tag.
    • Step 2: GA4 cross-check. Look at GA4 Realtime > Conversions for the last 4 hours. If GA4 also shows the drop, the conversion broke. If GA4 shows normal conversions, only the Google Ads pixel broke.
    • Step 3: Commerce platform check. Look at Shopify or BigCommerce orders for the same window. If orders held normal volume, only Google’s measurement broke; revenue is fine. If orders also dropped, traffic is converting in real life too, this becomes a real performance issue.
    • Step 4: Attribution model check. Tools > Attribution. If someone switched DDA -> Last click overnight, conversions get re-attributed away from Google Ads to other channels. Real conversions, just credited elsewhere.
  3. Don’t pause until you’ve cleared steps 1-3. A spurious pause based on broken measurement costs more than a few hours of accurate measurement.
  4. If steps 1-3 all show normal conversion behaviour, the issue is between Google’s reporting and your account. Wait for the next ingestion cycle (typically 4 hours). Some Google Ads conversion-pipeline lags do produce one-day-only “ghost drops” that resolve overnight.
  5. If steps 1-3 confirm a real drop, then check landing-page status (down? slow? was a Magento/Shopify deploy at the same time?), then check competitor activity (CPC spike?), then promo timing (did a 30%-off promo end yesterday?). In that order.
Quick reaction protocol:
  • Pixel check first, always.
  • Don’t restructure campaigns on a single-day alert.
  • 7-day rolling average is the rebound test, if today is a one-day blip, wait.
  • If the alert fires three days in a row, escalate (the gap is structural).
  • If it fires on a Monday after a sale ended Sunday, expected, not actionable.

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Sibling cards merchants should reference together

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Reconciling against the vendor’s own dashboard

Where to look in Google Ads UI: Google Ads > Overview shows daily conversions on the main chart. Hover the latest day to see today’s count vs trailing average. Google Ads > Reports > Predefined > Time > Day gives the day-by-day tabular view this card runs over. Filter to last 14 days, compare today vs same-DOW prior week. Google Ads > Tools > Conversions > Status shows pixel-fire status per conversion action; this is where a tag-break shows up FIRST as “No recent conversions” warnings. Other Google Ads views that look like the same number but aren’t:
  • All conversions trend: includes view-through. A primary-conversion drop with All-conversions stable suggests one specific conversion action broke (often the primary purchase pixel), not all of them.
  • Conversions by conversion action: per-action breakdown. If one specific action dropped to zero while others held, that’s the broken pixel. Diagnostic gold.
  • Search Lost IS: a coverage metric, not relevant to a conversion drop unless lost-IS-budget shows a budget-cap kicked in.
  • Conversions modelled vs observed: Google’s modelled conversions can fluctuate independently. A drop in observed but stable modelled may indicate a Consent Mode issue, not a tag break.
Why our number may differ from Google Ads UI (rare): Why the BUSINESS metric often differs (the IMPORTANT one): A “conversion drop” in Google Ads can mean any of:
  • Tag broke but real orders held (most common; cross-check commerce platform).
  • Real demand dropped (promo ended, season turned, competitor launched).
  • Attribution shifted (someone switched DDA <-> Last click; some channels lost credit, others gained).
  • Conversion action was disabled in Google Ads (someone toggled it off; orders are still happening, just not tracked).
  • Consent Mode v2 denial rate increased (more EU/UK users opted out; observed conversions drop, modelled conversions fill some gap).
The BUSINESS question is “did real orders drop?” That is answered by the commerce platform, not this card. Cross-connector reconciliation:

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Known limitations / merchant FAQs

The alert just fired. What’s the FIRST thing I should do? Open Clicks vs Conversions. If clicks held but conversions dropped, you have a tag-break, fix the pixel. If both clicks and conversions dropped, it’s an auction or demand issue, different fix path. This 30-second triage saves hours of misdirected investigation. Why doesn’t the alert fire on Mondays? Mondays after a weekend sale routinely show 25%+ drops because the sale ended. The same-DOW comparison helps: Monday 14 Apr is compared to Monday 7 Apr (also after a weekend). But if last weekend had no sale and this weekend did, the comparison can still trigger. We suppress duplicate alerts within 24 hours, so a follow-on Tuesday won’t double-fire. My alert fired but our orders are normal in Shopify, what’s going on? That’s the textbook tag-break signature. Real revenue is fine; only Google Ads’ measurement of it is broken. Action: check the conversion pixel on the order-confirmation page (Tag Assistant in Chrome makes this 60 seconds of work). A developer pushed code somewhere that removed or broke the tag. Once fixed, conversions will start flowing again, but you typically lose 24-72 hours of attribution data while the gap is closed. Can I trust this alert if I just changed my attribution model? No. Switching DDA <-> Last click rewrites which channel gets credit for past clicks; conversions can drop sharply on Google Ads while rising elsewhere. The alert may fire spuriously for 7-14 days after a model change. Note the date of any model switch and treat alerts in that window with extra scepticism. Why does this alert use 25% and not 10%? Conversion data is noisy at the daily level, especially for accounts with < 50 conversions/day. A 10% threshold would fire constantly on noise. 25% catches the structural drops without the noise floor. Larger accounts (200+ conversions/day) might want a tighter threshold, but the standard is 25% to keep false-positives down. What if I have very low daily conversion volume (< 10/day)? This alert will fire often by chance, the day-to-day variance is high. For low-volume accounts, the 7-day rolling Conversion Rate Trend is more reliable than the per-day alert. Adjust the alert threshold to 40-50% drop or disable for very low-volume accounts. My PMax campaign drop fires often, can I exclude it? PMax has higher inherent volatility because it shifts spend across channels (Search, Display, YouTube) without exposing it. A PMax conversion drop may reflect Google reallocating spend rather than performance regression. Cross-check with PMax campaign trends and look at PMax asset-group reports inside Google Ads. The alert fires, but I think it’s seasonal demand, what do I do? Cross-check (1) GA4 channel revenue (does it show the same pattern?), (2) commerce-platform total orders (are they down too?), (3) prior-year same-period (was last year similar at this time?). If all three say “real demand drop”, document it and don’t pause campaigns, you’d just hand share to competitors. Multi-currency setup? The alert is conversion-count-based, currency-independent. Each Google Ads account fires independently per its own conversion stream. Can I tune the alert window? Default 7-day same-DOW baseline. For accounts with weekly cycles (B2B, weekend-heavy DTC), this is right. For accounts with strong daily noise, a 14-day same-DOW or 21-day rolling baseline is more stable. Raise this with VortexIQ support to adjust.

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Tracked live in Vortex IQ Nerve Centre

Conversion Drop Alert is one of hundreds of KPI pulses Vortex IQ tracks across Google Ads and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.