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Cost Per Purchase

Définition

Cost Per Purchase is a Meta Ads metric that measures how much you spend on advertising to generate one purchase. Calculated by dividing total ad spend by the number of purchases attributed to your ads, it is the primary efficiency metric for e-commerce advertisers on Facebook and Instagram.

How to Calculate Cost Per Purchase

Cost Per Purchase = Total Ad Spend / Number of Purchases. In Meta Ads Manager, this metric appears when you select 'Purchase' as your conversion event. For example, spending $2,000 to generate 40 purchases gives you a $50 cost per purchase. Meta attributes purchases using click-through (7-day default) and view-through (1-day default) attribution windows. Understanding your attribution settings is critical because they directly affect how many purchases are credited to your ads.

Optimizing Cost Per Purchase

Lower your cost per purchase by improving every stage of the funnel. At the ad level, test creative variations (images, videos, carousels, UGC) to find what drives purchase intent. At the targeting level, use Lookalike audiences based on your best customers. At the landing page level, reduce friction in the checkout process, add trust signals, and ensure mobile optimization. Broad targeting with creative differentiation often outperforms narrow interest targeting on Meta because the algorithm excels at finding buyers within large audiences.

Cost Per Purchase Benchmarks

Typical Meta Ads cost per purchase ranges from $10-50 for consumer goods, $20-80 for fashion and apparel, and $30-100+ for high-ticket items. These benchmarks vary significantly by product price, competition, and season. Q4 holiday costs can increase 30-60% due to auction competition. Rather than benchmarking against industry averages, calculate your maximum allowable cost per purchase based on average order value, gross margin, and LTV. If your average order is $100 with 50% margin, any cost per purchase under $50 is profitable on the first order.

Tracking Cost Per Purchase with AdWhiz

AdWhiz monitors cost per purchase across your Meta ad campaigns, ad sets, and individual ads. The audit identifies which campaigns and creatives deliver the lowest purchase costs and which ones need optimization or pausing. By analyzing cost per purchase trends over time, AdWhiz detects creative fatigue and audience saturation early, giving you time to refresh campaigns before costs spiral upward.

Foire aux questions

A good cost per purchase depends on your product margins. If your average order value is $100 with 50% gross margin, anything under $50 is profitable on the first purchase. Factor in customer lifetime value for a more complete picture. Most e-commerce brands target a cost per purchase that is 20-30% of their average order value.

Rising cost per purchase typically signals creative fatigue (users have seen your ads too many times), audience saturation (your target audience is too small), or increased competition in the auction. Refresh your creative, expand your targeting, or test new audience segments to bring costs back down.

Meta's default 7-day click / 1-day view attribution window credits purchases that happen within 7 days of clicking or 1 day of viewing your ad. Changing to a narrower window (like 1-day click only) will report fewer purchases and a higher cost per purchase. Choose an attribution window that matches your typical purchase cycle.

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