Say an ad set has a daily budget of $200 and contains five ads. Ad networks rarely split spend evenly. Unless you set rules otherwise, they send more budget to the ads they predict will perform best.
| Ad | Spend |
|---|---|
| Ad 1 | $100 |
| Ad 2 | $50 |
| Ad 3 | $25 |
| Ad 4 | $20 |
| Ad 5 | $5 |
| Ad set total | $200 |
Formula: Ad Spend = Sum of the cost charged for each ad in the period.
Ad Spend for the ad set is $100 + $50 + $25 + $20 + $5 = $200. Ad 1 took half of it. That tells you the network favoured Ad 1. It does not tell you whether Ad 1 earned its share, so check conversions or revenue for each ad before moving budget.
