Ad Insertion Calculator

Mid-roll breaks are only added at fixed intervals — roughly every 15 minutes after the first 10 — so revenue increases in discrete jumps each time a new mid-roll slot becomes available, not gradually as duration rises. An episode that's 44 minutes long earns the same mid-roll revenue as one that's 46 minutes long, until it crosses the next 15-minute boundary.

Post-roll ads run after the episode content ends, so a meaningful share of listeners have already stopped listening by the time they play, reducing effective impressions and advertiser interest relative to a pre-roll spot everyone hears. This calculator applies a 50% discount to the pre-roll CPM as a standard planning assumption, not a measured figure from your specific audience.

Only up to the point where it crosses another mid-roll threshold. Between those thresholds, adding a few more minutes of content does not add any new ad inventory in this model, so revenue stays flat. The bigger lever for revenue is downloads per episode, which scales every ad slot's payout directly and continuously.

CPM stands for cost per mille (per thousand impressions) — the price an advertiser pays for every 1,000 times their ad is heard. This calculator divides your downloads per episode by 1,000 and multiplies by the relevant CPM rate for each ad slot type, then sums pre-roll, mid-roll, and post-roll revenue into the total.