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Explain ROAS for Meta Ads

EasyMetrics00:00
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Your question is Explain ROAS for Meta Ads. Take a moment with it on the right.

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Problem

Business Context

A mid-market ecommerce advertiser spends heavily on Meta Ads across Facebook Feed, Instagram Reels, and Stories. After a recent campaign review in Meta Ads Manager, the client says ROAS fell from 3.8x last month to 2.9x this month, even though total purchases increased.

Metric Scenario

The client spent $120,000 last month and attributed $456,000 in purchase value, for a 3.8x ROAS. This month, spend increased to $180,000 and attributed purchase value increased to $522,000, producing 2.9x ROAS. In the same period, purchases rose from 3,800 to 4,350, average order value fell from $120 to $100, and CPM increased from $14 to $18. The Account Executive wants you to explain ROAS clearly, show how it should be interpreted, and identify what additional cuts of the data would help explain the decline.

Requirements

  1. Define ROAS in plain business terms for a client using Meta Ads.
  2. Calculate ROAS for both months and explain why ROAS can decline even when revenue and purchases increase.
  3. Decompose the change into likely drivers such as spend, conversion efficiency, and average order value.
  4. Explain what caveats you would mention around attribution windows, incrementality, and campaign mix.
  5. Recommend 3 specific follow-up analyses in Meta Ads Manager or supporting data to diagnose the drop.

Data Available

  • Meta Ads Manager campaign report: campaign_id, objective, spend, impressions, clicks, purchases, purchase_value, placement, attribution_setting
  • Meta Pixel / Conversions API events: event_time, user_id, event_name, purchase_value, device_type, country
  • Shopify order table: order_id, order_time, customer_id, gross_revenue, net_revenue, discount_amount, product_category
  • Creative performance table: ad_id, format, audience, frequency, CTR, CPC, CPM, landing_page_views