Of all the variables you can control in your ad waterfall, floor prices may be the single most impactful — and the most commonly neglected. A well-tuned floor price strategy can increase your overall ad revenue by 10 to 25 percent. A poorly set one can quietly drain it.
What Are Floor Prices?
A floor price is the minimum eCPM you are willing to accept for an impression. Any bid below the floor gets rejected, and the impression passes to the next demand source in your waterfall. Floors exist to prevent your premium inventory from being sold at bargain prices — but set them too high and you will reject bids that would have generated meaningful revenue.
The Floor Price Dilemma
This is the core tension every publisher faces: higher floors mean higher eCPMs on the impressions that do fill, but lower fill rates overall. Lower floors mean more impressions monetized, but potentially at prices well below what advertisers would have been willing to pay.
The optimal floor price sits at the intersection — high enough to push advertisers to bid competitively, but low enough that you are not leaving impressions unfilled.
Common Floor Price Mistakes
Setting and Forgetting
Advertiser demand fluctuates by season, day of week, and even time of day. A floor price that was optimal in January may be leaving money on the table in March. Floors should be reviewed and adjusted at least weekly.
Using the Same Floor Everywhere
A rewarded video impression from a user in the United States is worth dramatically more than a banner impression from a user in Southeast Asia. Applying the same floor across all formats, geos, and placements is one of the most common revenue leaks we see.
Setting Floors Based on Averages
If your average eCPM is eight dollars, setting a floor at eight dollars means you are rejecting roughly half of all bids. Floors should be set based on the distribution of bids, not the average. Typically, an effective floor sits at the 20th to 30th percentile of your bid distribution.
A Better Approach: Segmented Dynamic Floors
Segment by Geography
Create separate floor prices for Tier 1 markets (US, UK, Australia, Western Europe), Tier 2 markets (Japan, Korea, Middle East), and emerging markets (Southeast Asia, India, Latin America, Africa). The right floor for each tier can differ by a factor of five or more.
Segment by Ad Format
Rewarded video commands the highest floors, followed by interstitials, then native, then banners. Do not apply a banner-appropriate floor to your rewarded video inventory — you will leave significant revenue uncaptured.
Update Regularly
Review floor performance weekly. Look at two metrics: fill rate and average eCPM. If fill rate is above 95 percent, your floors are probably too low — raise them by 10 to 15 percent. If fill rate drops below 70 percent, your floors are too high — lower them incrementally until fill recovers.
The publishers who see the best results treat floor prices as a living variable, not a fixed setting. Small weekly adjustments compound into significant revenue gains over time.
How a Managed Partner Helps
Dynamic floor optimization requires continuous monitoring and adjustment across potentially dozens of segment and format combinations. A managed monetization partner automates this process, using historical performance data to adjust floors in near real-time — ensuring you are always capturing the maximum value from every impression without manual effort.