{"id":574,"date":"2026-03-18T19:45:09","date_gmt":"2026-03-18T17:45:09","guid":{"rendered":"https:\/\/www.genecy.com\/resources\/?p=574"},"modified":"2026-03-18T19:46:38","modified_gmt":"2026-03-18T17:46:38","slug":"how-to-estimate-inventory-size-in-google-ad-manager","status":"publish","type":"post","link":"https:\/\/www.genecy.com\/resources\/574-how-to-estimate-inventory-size-in-google-ad-manager\/","title":{"rendered":"How to Estimate Inventory Size in Google Ad Manager"},"content":{"rendered":"\n<p>When sales teams ask about inventory size, they usually want one simple answer: <strong>&#8220;<\/strong><em>How many impressions can we sell?<\/em><strong>&#8220;<\/strong><\/p>\n\n\n\n<p>In Google Ad Manager, this is not one fixed number. Inventory depends on traffic, demand, and setup. This article explains how to use <strong>historical reports<\/strong> to understand inventory size for planning, and how to use this data correctly.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Inventory Size vs Available Inventory<\/strong><\/h2>\n\n\n\n<p>First, it is important to separate two terms.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>Inventory size<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list detail-list\">\n<li>Shows how many impressions an ad unit usually delivers<\/li>\n\n\n\n<li>Based on historical data<\/li>\n\n\n\n<li>Used for planning and packaging<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>Available inventory<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list detail-list\">\n<li>Shows how many impressions are still free in the future<\/li>\n\n\n\n<li>Based on current demand and reservations<\/li>\n\n\n\n<li>Calculated only in Forecasting<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>This article focuses on <strong>inventory size for planning<\/strong>, not final availability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Historical Reports Are Useful for Planning<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>Historical reports show what really happened on the site. They help ad ops and sales teams understand:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Which ad units are strong<\/li>\n\n\n\n<li>Which ad units are saturated<\/li>\n\n\n\n<li>How stable traffic is month by month<\/li>\n\n\n\n<li>What volumes are realistic to discuss with clients<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>This data is often used <strong>before<\/strong> running a forecast.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Recommended Report Setup<\/strong><\/h2>\n\n\n\n<p>Sign in to your Google Ad Manager account, go to <strong>Reporting<\/strong>, and select <strong>&#8220;Interactive reports.<strong>&#8220;<\/strong><\/strong> Then click<strong> <strong>&#8220;<\/strong>Create my own report.<strong>&#8220;<\/strong><\/strong> By default, this creates a <strong>Historical report<\/strong>, which is what you need. Please make sure that the selected report type is <strong>Historical<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"527\" src=\"https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-1024x527.jpg\" alt=\"\" class=\"wp-image-588\" srcset=\"https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-1024x527.jpg 1024w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-300x155.jpg 300w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-768x396.jpg 768w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-1536x791.jpg 1536w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports-1200x618.jpg 1200w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_interactive_reports.jpg 1963w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/figure>\n\n\n\n<p>To understand inventory size by ad unit, use a <strong>Historical report<\/strong> with these settings:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Dimension<\/strong><\/td><td>&#8211; Ad unit (all levels) or Placement<\/td><\/tr><tr><td><strong>Metrics<\/strong><\/td><td>&#8211; Total ad requests<br>&#8211; Total impressions<br>&#8211; Total fill rate<\/td><\/tr><tr><td><strong>Date range<\/strong><\/td><td>&#8211; Last 3 <strong>full <\/strong>months or last 6 <strong>full <\/strong>months<br>&#8211; Split by month<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Select the period from the <strong>first day of the month to the last day of the selected month<\/strong>. This is important because the &#8220;split by month&#8221; option splits by calendar months, not by ~30-day periods.<\/p>\n\n\n\n<p>If you select something like the last 90 days, the report will usually be split into 5 months, where the first and last months are only partial.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"327\" src=\"https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-1024x327.jpg\" alt=\"\" class=\"wp-image-586\" srcset=\"https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-1024x327.jpg 1024w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-300x96.jpg 300w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-768x246.jpg 768w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-1536x491.jpg 1536w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1-1200x384.jpg 1200w, https:\/\/www.genecy.com\/resources\/wp-content\/uploads\/2026\/03\/gam_inventory_size_1.jpg 1927w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/figure>\n\n\n\n<p>This setup gives a clear picture of capacity and demand.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using Averages for More Accurate Planning<\/h2>\n\n\n\n<p>To get more stable numbers, it is recommended to export the report to Excel (or Google Sheets) and calculate averages.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>Steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Export the report<\/li>\n\n\n\n<li>Calculate the average impressions per ad unit<\/li>\n\n\n\n<li>Optionally calculate average fill rate and ad requests<\/li>\n<\/ul>\n\n\n\n<p>This helps to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smooth out traffic spikes<\/li>\n\n\n\n<li>Avoid planning based on one strong or weak month<\/li>\n\n\n\n<li>Get a more reliable baseline for sales discussions<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to Read the Numbers<\/strong><\/h2>\n\n\n\n<p>These numbers should be treated as a working baseline, not as guaranteed inventory.<\/p>\n\n\n\n<p>Each metric shows a different part of inventory.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>Total Ad Requests<\/strong><\/h3>\n\n\n\n<p>This is the <strong>theoretical maximum<\/strong>.<\/p>\n\n\n\n<p>It shows how many times an ad unit was requested.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>High ad requests mean:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Strong traffic<\/li>\n\n\n\n<li>Potential for growth<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Total Impressions<\/strong><\/h3>\n\n\n\n<p>This shows <strong>real delivered inventory<\/strong>.<\/p>\n\n\n\n<p>It is the most important number for planning.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>This answers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This shows the typical monthly volume of the ad unit.<\/li>\n\n\n\n<li>What volume sales can work with<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Fill Rate<\/strong><\/h3>\n\n\n\n<p>Fill rate shows how much of the inventory is already used.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High impressions + high fill rate \u2192 saturated placement<\/li>\n\n\n\n<li>High requests + low fill rate \u2192 growth opportunity<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Fill rate helps understand pressure on inventory.<\/p>\n\n\n\n<p>If your fill rate is already high, the next step is not more demand, but better-performing creatives. You can explore formats like <a href=\"https:\/\/www.genecy.com\/gam\/templates\/parallaxer\/\">Parallaxer<\/a> to increase CTR and revenue per impression.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Using Viewability as a Bonus Metric<\/strong><\/h2>\n\n\n\n<p>If you sell premium or viewable inventory, add <strong>viewability rate<\/strong> to the report.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>Recommended metrics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Active View measurable impressions<\/li>\n\n\n\n<li>Active View viewable impressions<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Viewability shows the <strong>real sellable quality<\/strong> of inventory.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>Example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3M impressions<\/li>\n\n\n\n<li>65% viewability<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>In reality, only ~2M impressions are viewable.<\/p>\n\n\n\n<p>This is important for planning premium campaigns.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How Sales and Ad Ops Use This Report<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>Sales teams use it to:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Build media kits<\/li>\n\n\n\n<li>Package placements<\/li>\n\n\n\n<li>Set realistic expectations<\/li>\n\n\n\n<li>Discuss monthly volumes<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Example: &#8220;This mobile top ad unit usually delivers around 2.5-3M impressions per month.&#8221;<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>Ad ops teams use it to:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Validate deal sizes<\/li>\n\n\n\n<li>Spot risky ad units<\/li>\n\n\n\n<li>Compare with forecasting results<\/li>\n\n\n\n<li>Avoid overpromising inventory<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>This report is often the first step before forecasting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What This Report Does NOT Do<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>This report does not:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Show future available inventory<\/li>\n\n\n\n<li>Replace Forecasting<\/li>\n\n\n\n<li>Guarantee delivery<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Before confirming any campaign, inventory must always be checked in <strong>Forecasting<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Common Mistakes<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<ul class=\"wp-block-list\">\n<li>Calling this &#8220;available inventory&#8221;<\/li>\n\n\n\n<li>Using only one month of data<\/li>\n\n\n\n<li>Ignoring fill rate or viewability<\/li>\n\n\n\n<li>Promising volumes without forecasting<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Historical data is for planning, not booking.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Final Thoughts<\/strong><\/h2>\n\n\n\n<p>Historical reports are a strong tool to understand inventory size. They help teams plan, package, and communicate better.<\/p>\n\n\n\n<div class=\"wp-block-group detail-block\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p>One simple rule to remember:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use historical reports to understand capacity.<\/strong><\/li>\n\n\n\n<li><strong>Use forecasting to confirm availability.<\/strong><\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>Used together, they help avoid delivery problems and unrealistic promises.<\/p>\n\n\n\n<p>Want to get more revenue from the same inventory?<br>Explore ready-to-use <a href=\"https:\/\/www.genecy.com\/gam\/templates\/\">rich media templates for Google Ad Manager<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When sales teams ask about inventory size, they usually want one simple answer: &#8220;How many impressions can we sell?&#8220; In Google Ad Manager, this is not one fixed number. Inventory depends on traffic, demand, and setup. This article explains how to use historical reports to understand inventory size for planning, and how to use this &hellip; <a href=\"https:\/\/www.genecy.com\/resources\/574-how-to-estimate-inventory-size-in-google-ad-manager\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;How to Estimate Inventory Size in Google Ad Manager&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":608,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[137],"tags":[],"class_list":["post-574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gam-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Estimate Inventory Size in Google Ad Manager - Google Ad Manager Tutorials &amp; Resources | Genecy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.genecy.com\/resources\/574-how-to-estimate-inventory-size-in-google-ad-manager\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Estimate Inventory Size in Google Ad Manager - Google Ad Manager Tutorials &amp; Resources | Genecy\" \/>\n<meta property=\"og:description\" content=\"When sales teams ask about inventory size, they usually want one simple answer: &#8220;How many impressions can we sell?&#8220; In Google Ad Manager, this is not one fixed number. 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