{"id":20271,"date":"2020-01-30T09:40:55","date_gmt":"2020-01-30T09:40:55","guid":{"rendered":"https:\/\/www.arimetrics.com\/glosario-digital\/cpa"},"modified":"2026-09-21T15:38:48","modified_gmt":"2026-09-21T15:38:48","slug":"cpa","status":"publish","type":"encyclopedia","link":"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cpa","title":{"rendered":"CPA"},"content":{"rendered":"<p><img decoding=\"async\" class=\"boxpad alignright size-full wp-image-14123\" style=\"margin-top:0;\" src=\"https:\/\/www.arimetrics.com\/wp-content\/uploads\/2020\/01\/cpa-coste_por_adquisicion.jpg\" alt=\"CPA - Cost per acquisition\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.arimetrics.com\/wp-content\/uploads\/2020\/01\/cpa-coste_por_adquisicion.jpg 300w, https:\/\/www.arimetrics.com\/wp-content\/uploads\/2020\/01\/cpa-coste_por_adquisicion-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><strong>Definition:<\/strong><\/p>\n<p><strong>CPA<\/strong>, or <strong>cost per acquisition<\/strong>, is a metric showing the average cost of obtaining a conversion attributed to a campaign or group of marketing activities. It is calculated by dividing the recorded cost by the number of acquisitions generated during the same period.<\/p>\n<p>An acquisition does not always have to be a sale or a new customer. It may be a purchase, registration, enquiry, call or another predefined <a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/conversion\">conversion<\/a>. The meaning of CPA therefore depends on which action is counted and how it is attributed.<\/p>\n\n<h2>What CPA measures<\/h2>\n<p>Four elements are needed to interpret a CPA:<\/p>\n<ul>\n<li><strong>Action or acquisition:<\/strong> the event the organization considers valid.<\/li>\n<li><strong>Included cost:<\/strong> advertising spend or the group of costs used in the calculation.<\/li>\n<li><strong>Period:<\/strong> the interval during which costs and conversions are recorded.<\/li>\n<li><strong>Attribution:<\/strong> the rule assigning each conversion to a campaign, channel or interaction.<\/li>\n<\/ul>\n<p>A CPA figure alone does not show whether a campaign is profitable. It must be compared with the economic value of the conversion, margin, result quality and business objectives.<\/p>\n<h2>CPA formula and example<\/h2>\n<p>The basic formula is:<\/p>\n<p><strong>CPA = attributable cost \/ number of acquisitions<\/strong><\/p>\n<p>The calculation requires the following steps:<\/p>\n<ol>\n<li><strong>Define the conversion:<\/strong> specify which event will count as an acquisition.<\/li>\n<li><strong>Set the cost boundary:<\/strong> decide whether to include only media spend or also production, technology and management.<\/li>\n<li><strong>Use the same period:<\/strong> costs and conversions must belong to a consistent window.<\/li>\n<li><strong>Divide cost by conversions:<\/strong> if a campaign spends EUR 2,400 and generates 80 valid registrations, its CPA is EUR 30 per registration.<\/li>\n<\/ol>\n<p>If some conversions occur after the click or require commercial validation, the result may change when the data is updated.<\/p>\n<h2>CPA as a cost-per-action payment model<\/h2>\n<p>CPA can also describe an advertising model in which the advertiser pays when an agreed action is completed. It is common in affiliate marketing, lead generation and performance-based agreements.<\/p>\n<ul>\n<li><strong>The action must be defined:<\/strong> a sale, validated lead, installation or another verifiable event.<\/li>\n<li><strong>The price may be fixed:<\/strong> each approved action generates a previously agreed commission.<\/li>\n<li><strong>Validation is required:<\/strong> duplicates, fraud, cancellations and invalid registrations may be excluded.<\/li>\n<li><strong>The model does not remove risk:<\/strong> volume, quality, margins and attribution conditions still affect the result.<\/li>\n<\/ul>\n<p>In this context, CPA may stand for <em>cost per action<\/em>. When used as a campaign metric, it commonly means <em>cost per acquisition<\/em>. The formula may be the same, but the commercial agreement and purpose are different.<\/p>\n<h2>Target CPA in advertising platforms<\/h2>\n<p><strong>Target CPA<\/strong> is a value used by certain automated bidding strategies. The system adjusts bids in an attempt to generate conversions around the stated average cost, using the signals and data available to it.<\/p>\n<ul>\n<li><strong>It is an average target:<\/strong> individual conversions may cost more or less than the configured amount.<\/li>\n<li><strong>It requires reliable measurement:<\/strong> duplicated actions, incomplete tags and poorly defined values distort optimization.<\/li>\n<li><strong>It depends on history and the market:<\/strong> competition, budget, audience and conversion rate influence the result.<\/li>\n<li><strong>It does not guarantee volume or profitability:<\/strong> an excessively low target may restrict participation, while a cheap conversion may have little value.<\/li>\n<\/ul>\n<p>Target CPA should be reviewed alongside conversion volume, quality and value rather than as an isolated figure.<\/p>\n<h2>CPA, CAC, CPL, CPC and CPM differences<\/h2>\n<ul>\n<li><strong>CPA:<\/strong> average cost of the action or acquisition defined for the analysis.<\/li>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cac\">CAC<\/a>:<\/strong> total cost associated with acquiring a new customer; it may include more costs and stages than advertising CPA.<\/li>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cpl\">CPL<\/a>:<\/strong> cost per generated lead, even if that lead has not become a customer.<\/li>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cpc\">CPC<\/a>:<\/strong> cost per click, regardless of whether the user subsequently completes a conversion.<\/li>\n<li><strong><a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/cpm\">CPM<\/a>:<\/strong> cost per thousand impressions, focused on advertisement exposure.<\/li>\n<\/ul>\n<p>The appropriate metric depends on the objective and the stage being observed. One campaign can record CPM, CPC, CPL and CPA simultaneously without those measures being interchangeable.<\/p>\n<h2>How to analyze and improve CPA<\/h2>\n<ul>\n<li><strong>Check measurement:<\/strong> verify events, deduplication, consent and attribution windows.<\/li>\n<li><strong>Segment the results:<\/strong> compare campaigns, audiences, devices, locations and conversion types.<\/li>\n<li><strong>Evaluate quality:<\/strong> distinguish valid actions from incomplete registrations, returns or customers with insufficient value.<\/li>\n<li><strong>Review the funnel:<\/strong> identify losses between click, page, form, sale and repeat activity.<\/li>\n<li><strong>Relate cost to value:<\/strong> compare CPA with margin, revenue, repeat business and <a href=\"https:\/\/www.arimetrics.com\/en\/digital-glossary\/roi\">ROI<\/a>.<\/li>\n<li><strong>Test controlled changes:<\/strong> modify the offer, creative, targeting or experience and measure the effect without automatically attributing it to a single variable.<\/li>\n<\/ul>\n<p>Reducing CPA does not always improve the business outcome. If optimization decreases the quality or volume of profitable acquisitions, a lower average cost may conceal a worse result.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What CPA or cost per acquisition is, how it is calculated, how it differs from CAC, CPL, CPC and CPM, and how to interpret target CPA.<\/p>\n","protected":false},"author":6,"featured_media":0,"template":"","encyclopedia-tag":[1229],"class_list":["post-20271","encyclopedia","type-encyclopedia","status-publish","hentry","encyclopedia-tag-advertising-costs"],"_links":{"self":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia\/20271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia"}],"about":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/types\/encyclopedia"}],"author":[{"embeddable":true,"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/users\/6"}],"wp:attachment":[{"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/media?parent=20271"}],"wp:term":[{"taxonomy":"encyclopedia-tag","embeddable":true,"href":"https:\/\/www.arimetrics.com\/en\/wp-json\/wp\/v2\/encyclopedia-tag?post=20271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}