Measuring the impact of charity ads on your website can be challenging, but it's important to track the results to assess the effectiveness of your efforts. Some metrics you can use to measure impact include click-through rates (CTR), conversion rates, and the number of donations or contributions generated. You can also use tools like Google Analytics to track user behavior and engagement with your site. It's crucial to set specific goals and benchmarks before implementing charity ads on your website and regularly evaluate your performance against them.