To calculate the fill rate of a native ad programmed to generate affiliate traffic, divide the number of ads actually served by the total number of ad requests, then multiply by 100 to get a percentage. The formula is: Fill Rate = (Impressions / Ad Requests) × 100. For example, if a native ad receives 10,000 requests and serves 8,000 impressions, the fill rate is 80%. This metric is essential for affiliate marketers to gauge how effectively their inventory is being utilized. A low fill rate may indicate issues with ad relevance, demand partner performance, or geo-targeting mismatches. Monitoring fill rate helps optimize placements, improve user experience, and ensure affiliate campaigns are monetized efficiently by maximizing ad exposure and potential click-throughs.