The chart displays the US Online Video Ad Spending by Length from 2015 to 2025, showing a significant and continuous increase in spending across all three ad lengths. 30-second Ads (USD billions) consistently receive the largest ad spend, starting at 5.8 billion USD in 2015 and projected to nearly triple to 14 billion USD in 2025. 15-second Ads (USD billions) are the second largest format, growing from 4.2 billion USD in 2015 to 10.5 billion USD in 2025. 5-second Ads (USD billions) have the lowest spend, increasing from 1.5 billion USD in 2015 to 6 billion USD in 2025. The total ad spend on 30-second Ads in 2025 is more than double the spend on 5-second Ads in that same year ($\mathbf{14 \text{ billion USD} / 6 \text{ billion USD} \approx 2.33}$), indicating a strong preference for longer video formats for ad placement.
| Labels | 5-second Ads (USD billions) | 15-second Ads (USD billions) | 30-second Ads (USD billions) |
| 2015 | 1.5 | 4.2 | 5.8 |
| 2016 | 1.8 | 5.4 | 6.5 |
| 2017 | 2.1 | 6 | 7 |
| 2018 | 2.5 | 6.8 | 8.2 |
| 2019 | 3 | 7.5 | 9 |
| 2020 | 3.5 | 8 | 9.5 |
| 2021 | 4 | 8.5 | 10 |
| 2022 | 4.5 | 9 | 11 |
| 2023 | 5 | 9.5 | 12 |
| 2024 | 5.5 | 10 | 13 |
| 2025 | 6 | 10.5 | 14 |
