Why TikTok CPMs Have Shifted 30% Since Last Year (With the Data)

Platform-level CPM shifts are one of the fastest-moving inputs into fair-rate calculations, and they're also the easiest to miss if your last benchmark is more than a quarter old.

Across Harpper's index, TikTok CPMs have moved roughly 30% year over year, driven by three factors visible in the placement data:

Ad load increased. More paid inventory competing for the same feed real estate pushes organic-adjacent creator content to work harder for the same attention, which shows up as lower effective reach per post at a given rate.

Algorithm changes redistributed reach toward larger accounts. A shift that favored established creators over emerging ones concentrated impressions among fewer accounts, pushing up rates for the creators best positioned to benefit.

Brand demand on the platform grew faster than creator supply in several categories, particularly fitness and beauty, which pushed asking rates up independent of any change in actual delivered value.

The result: a rate that looked fair twelve months ago can be meaningfully stale today, in either direction. A benchmark that isn't refreshed continuously will systematically mis-price deals on fast-moving platforms — usually in the creator's favor, since asking rates tend to update faster than brand budgeting cycles do.

This is the argument for a live index over a quarterly rate card: platform shifts don't wait for your next planning cycle, and neither should your pricing.

Harpper's rate index updates continuously. Price against this quarter's market, not last year's.