How do I measure Performance Max for sports nutrition?
If you sell sports nutrition, measure Performance Max on new customers, not total conversions. Reorders can fill its report with buyers who would have come back anyway. Split new and returning buyers, keep brand searches out of its count, and test before you raise the budget.
By Joris van Huët, Founder & CEOUpdated 5 min read
Run the numbers for your store: the free break-even ROAS calculator.
If you sell sports nutrition, measure Performance Max on new customers, not total conversions. Reorders of protein and supplements can fill its report with buyers who would have come back anyway. Split its results into new and returning customers, keep your brand searches out of its count, and test it before you raise the budget.
If you sell sports nutrition
Your products run out. A tub of protein, a bottle of creatine or a box of bars lasts a few weeks, then the buyer needs another. Regulars come back on that clock, with or without an ad. Some type your address. Others search your brand or the exact flavour, and some click whichever Shopping ad sits on top.
Performance Max is built to stand in that path. It serves on Search and Shopping, and its ads using product data include dynamic remarketing on the Display Network. A regular who clicks on the way to a reorder becomes a Performance Max conversion. First orders look different: if a new buyer compares ingredients, reviews and prices, the journey runs longer and touches more.
What one store's export shows
Store A is one store's anonymised GA4 export, 1 January 2024 to 21 August 2026. It holds shares of revenue only: no ad spend, no order counts. Nothing in it says the store sells sports nutrition. It does not mark first or repeat orders either, so treat it as a shape to compare.
| What the export shows | Share of revenue | Source cell |
|---|---|---|
| Journeys with 1 touch (0.5 days to buy) | 79.5% | Journeys sheet, 1 touch row |
| Direct, in last click, first click and touched views | 57.7% | Channels sheet, Direct row |
| Journeys with 10 or more touches (16.0 days to buy) | 3.0% | Journeys sheet, 10+ touches row |
On the Journeys sheet, one-touch journeys hold 79.5% of revenue, and they close in 0.5 days. If your reorders look like that, they need no persuading: one visit, one checkout. Any ad standing in that visit collects the credit.
On the Channels sheet, Direct holds 57.7% of revenue in every view. If your regulars type your address, Performance Max has nothing to claim. If they search your brand instead, it can.
At the far end of the Journeys sheet, journeys of 10 or more touches hold 3.0% of revenue at 16.0 days to buy. That is the shape a careful first order might take. If your new customers buy like that, a test shorter than their buying time will undercount what a campaign started.
The export cannot say which purchases were reorders. For that you need Google's customer segments, or Shopify's counts of new and returning customers.
What changes for a sports nutrition store?
- Judge it on new customers. With a customer acquisition goal on, Google splits conversions into new and returning. Under auto-detection, anyone who bought in the last 540 days counts as returning, so regular reorderers land there.
- Your list beats Google's guess. Google auto-detects existing customers from tracked purchases, and you can add your own customer list. Google notes that a list under 1,000 members may hold back new customer acquisition.
- New Customer Only is a blunt tool. Google recommends it only with strict acquisition budgets, and says to run a separate campaign for existing customers. If reorders pay your bills, measure both campaigns, not just the new one.
- Brand and flavour searches. Brand exclusions keep Performance Max off your brand on Search, Shopping and YouTube search. If you tick the box that allows Shopping ads on excluded brands, reorders can still arrive through Shopping.
- Promotions bend tests. If a sale runs during a test, the test measures the sale too. Keep tests clear of your biggest promotion weeks.
What to do this week
- Add the New vs. returning customers segment. In the Campaigns table, click Segment and choose New vs. returning customers; it needs a customer acquisition goal and purchase optimization. Pass: new customers are a real share of Performance Max purchases. Fail: most are returning, so the campaign mostly resells to regulars.
- Give Google your existing customers. Go to Conversions in the Goals menu, click Edit goal in the Customer lifecycle optimization section and pick your customer list. Pass: a list of 1,000 or more members is selected. Fail: no list, or a smaller one, so Google is guessing who is new.
- Check Shopify's view of Google buyers. In Shopify admin, go to Growth and click View channel report. Add the new customers and returning customers metrics, then read the Google row. Pass: first-time customers from Google sit near Google's own new customer count. Fail: Shopify shows mostly returning customers, whatever Google says.
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
Sources, 1 October 2026: About Performance Max channels (Google Ads Help); Measure your lifecycle goals campaigns (Google Ads Help); How customer lifecycle goals detect customer segments (Google Ads Help); About customer lifecycle goals (Google Ads Help); Apply brand exclusions to Performance Max or Search campaigns (Google Ads Help); Measuring marketing performance (Shopify Help Center).
Related answers
Frequently asked questions
Does Performance Max count reorders as conversions?
Yes. A repeat purchase after an ad interaction counts like any other. With a customer acquisition goal on, Google splits them out, and treats a buyer as returning after a purchase within the last 540 days.Should a supplement store use New Customer Only?
Only with a strict acquisition budget, by Google's own advice. Google also says to run a separate campaign for existing customers in that mode. If your revenue leans on reorders, measure both campaigns, not just the new one.How does Google know who my existing customers are?
By default it auto-detects them from up to 540 days of tracked purchases. You can add a customer list or a tag-based list in your lifecycle goal settings. Google warns that a list under 1,000 members may limit new customer acquisition.
Go deeper: Incrementality testing, explained.
Sixty-second versions of these ideas: Causality Engine on YouTube Shorts.
Keep reading
Terms in this article
- Ad SpendAd Spend is the total amount invested in advertising campaigns. It is measured against Return on Ad Spend (ROAS) to evaluate campaign effectiveness.
- AttributionAttribution identifies user actions that contribute to a desired outcome and assigns value to each. It reveals which marketing touchpoints drive conversions.
- CausalityCausality is the relationship where one event directly causes another, essential for identifying specific actions that drive desired outcomes in marketing.
- ConversionConversion is a specific, desired action a user takes in response to a marketing message, such as a purchase or a sign-up.
- Customer acquisitionCustomer acquisition attracts new customers to a business. For e-commerce, this means driving the right traffic to the website.
- Google AdsGoogle Ads is an online advertising platform where advertisers bid to display ads, service offerings, and product listings.
- IncrementalityIncrementality measures the true causal impact of a marketing campaign. It quantifies the additional conversions or revenue directly from that activity.
- MetricsMetrics are quantifiable measures that track and assess business process status. They evaluate campaign performance and inform attribution analysis.