ROAS and margin: buyer questions answered
14 buyer questions about ROAS and margin, each answered from the platforms' own help pages: a short answer, a step-by-step walkthrough with menu paths, and for some questions a version for one store type.
By Joris van Huët, Founder & CEOUpdated 4 min read
Run the numbers for your store: the free break-even ROAS calculator.
Each answer below takes one buyer question about ROAS and margin and answers it from the platforms' own help pages, read on 1 October 2026. Read the short answer first. If you need to act in GA4, Shopify, Meta or Google Ads, the step-by-step version gives the menu paths.
The questions
What is a good ROAS for a Shopify store?
- The short answer: What is a good ROAS for a Shopify store?
- Step by step: How to set a good ROAS target for Shopify, step by step
- For one store type: What is a good ROAS for a health and beauty Shopify store?
What is the difference between ROAS and ROI?
- The short answer: What is the difference between ROAS and ROI?
- Step by step: ROAS vs ROI: how to calculate both, step by step
What is MER in ecommerce?
- The short answer: What is MER in ecommerce?
- Step by step: How to calculate MER for your store, step by step
- For one store type: What does MER tell a home goods store?
Is a 3x ROAS good?
- The short answer: Is a 3x ROAS good?
- Step by step: How to check if a 3x ROAS is profitable, step by step
How do I calculate ROAS?
- The short answer: How do I calculate ROAS?
- Step by step: How to calculate ROAS in Google Ads, Meta and GA4
- For one store type: How do I calculate ROAS for a pet products store?
What ROAS should I target on Meta ads?
- The short answer: What ROAS should I target on Meta ads?
- Step by step: How to set your Meta ads ROAS target, step by step
What ROAS should I target on Google Shopping?
- The short answer: What ROAS should I target on Google Shopping?
- Step by step: How to set a Google Shopping target ROAS, step by step
- For one store type: What Google Shopping ROAS suits a food and drink store?
Why is my ROAS high but I am not profitable?
- The short answer: Why is my ROAS high but I am not profitable?
- Step by step: High ROAS but no profit: how to find the leak, step by step
What is blended ROAS?
- The short answer: What is blended ROAS?
- Step by step: How to calculate blended ROAS, step by step
- For one store type: What is blended ROAS for a consumer electronics store?
Should I scale an ad with 2x ROAS?
- The short answer: Should I scale an ad with 2x ROAS?
- Step by step: How to check a 2x ROAS ad before scaling, step by step
How do margins change my target ROAS?
- The short answer: How do margins change my target ROAS?
- Step by step: How to reset target ROAS when your margin changes
- For one store type: How do margins change a fashion store's target ROAS?
What is contribution margin for ecommerce?
- The short answer: What is contribution margin for ecommerce?
- Step by step: How to calculate contribution margin in Shopify
What is POAS?
- The short answer: What is POAS?
- Step by step: How to calculate POAS for your store, step by step
- For one store type: What is POAS for a sports nutrition store?
How do returns affect ROAS?
- The short answer: How do returns affect ROAS?
- Step by step: How to calculate ROAS after returns, step by step
How to read these answers
Each answer opens with the short version in bold. Most then set one store's anonymised GA4 export next to the usual answer. That export describes one store, not a benchmark, and holds shares of revenue only.
Every other figure comes from a platform's own help page, linked inside the answer, or is a worked example labelled as one. Each answer ends with three checks you can run this week, with what a pass and a fail look like.
Check the homework. Your GA4 Attribution paths export already holds the evidence. Causality Engine reads that one file and shows what each channel caused next to what last-click gave it, in 1 to 2 minutes, for €99 once (excluding VAT), refundable within 30 days. Check the homework
Related answers
Frequently asked questions
Where do the facts in these ROAS and margin answers come from?
From the platforms' own help pages, read on 1 October 2026 and linked inside each answer, and from one store's anonymised GA4 export. That export holds shares of revenue only, and it describes one store, not a benchmark.Which ROAS and margin answer should I read first?
Start with the question closest to the decision in front of you. Read the short answer first. If you need to act in the platform, the step-by-step version gives the menu paths.Can I check these ROAS and margin answers on my own store?
Yes. Every answer ends with three checks you can run this week in Shopify, GA4 or the ad platform, each with what a pass and a fail look like.
Go deeper: Causal attribution, explained.
Sixty-second versions of these ideas: Causality Engine on YouTube Shorts.
Keep reading
Terms in this article
- AttributionAttribution identifies user actions that contribute to a desired outcome and assigns value to each. It reveals which marketing touchpoints drive conversions.
- Attribution ModelAn Attribution Model defines how credit for conversions is assigned to marketing touchpoints. It dictates how marketing channels receive credit for sales.
- CausalityCausality is the relationship where one event directly causes another, essential for identifying specific actions that drive desired outcomes in marketing.
- Google AdsGoogle Ads is an online advertising platform where advertisers bid to display ads, service offerings, and product listings.
- Google ShoppingGoogle Shopping is a Google service allowing users to search for products and compare prices from online retailers.
- IncrementalityIncrementality measures the true causal impact of a marketing campaign. It quantifies the additional conversions or revenue directly from that activity.
- Incrementality TestingIncrementality Testing measures the additional impact of a marketing campaign. It compares exposed and control groups to determine causal effect.
- RevenueRevenue is the total income generated by the sale of goods or services related to a company's primary operations.