How do you calculate gross impressions?

Gross impressions are calculated by multiplying the total number of times an advertisement is displayed (impressions) by the number of unique placements or platforms where the ad appears. For example, if an ad is shown 1,000 times on a website and 500 times on social media, the gross impressions would be 1,000 + 500 = 1,500. This metric helps advertisers understand the overall reach of their campaigns across various channels.