CPM — cost per mille, from the Latin for thousand — is the standard pricing unit for newsletter advertising. The formula: CPM = (Total Ad Spend ÷ Impressions) × 1,000. In newsletter advertising, impressions are typically measured as opens or sends, depending on what the seller and buyer agree. Sponsorship deals priced on opens are more defensible for advertisers (you're paying for people who actually saw the email); deals priced on sends favor publishers with high list sizes. CPM benchmarks vary significantly by niche. General interest, lifestyle, and personal essays: $5–$12. News and media: $10–$20. Consumer tech and software: $15–$35. Marketing, growth, and business: $20–$45. Finance, investing, and wealth: $30–$80. Developer and engineering: $35–$80+. B2B SaaS with enterprise buyers: $50–$120. The premium in finance and B2B reflects audience purchasing power and the direct economic value readers assign to edge information — a subscriber who makes investment decisions based on your content is worth more to sponsors than a subscriber who consumes for entertainment. Direct sponsorships command higher CPMs than programmatic ads. When a brand hand-picks a creator's newsletter and agrees a rate for a specific placement, they're paying for the audience relationship and editorial context — something a programmatic ad cannot replicate. This editorial adjacency premium justifies CPMs 2–4× higher than programmatic rates for the same audience size. Programmatic newsletter ads (served by platforms like InfluencersKit's ad network) fill at lower CPMs but require no sales effort and fill inventory that would otherwise go unmonetised. Pricing your own sponsorships: multiply your expected opens by your target CPM ÷ 1,000. A newsletter with 5,000 opens targeting $30 CPM would price a primary sponsorship at $150. Most newsletters sell primary (top-of-email) and secondary (mid or bottom) placements at different rates — primary is typically 1.5–2× secondary. Use InfluencersKit's sponsorship rate calculator to benchmark your pricing against similar newsletters. eCPM (effective CPM) is a related metric used to compare the yield of different monetisation channels. If your newsletter generates $300 from direct sponsorships and $120 from programmatic ads on a send with 8,000 opens, your blended eCPM is ($420 ÷ 8,000) × 1,000 = $52.50. Tracking eCPM across sends lets you measure whether your overall monetisation is improving even as your list grows and your send mix changes. Newsletters that add direct deals alongside programmatic typically see eCPM increase 40–70% compared to programmatic-only monetisation. Tracking eCPM monthly across all revenue streams is the clearest signal that your monetisation strategy is improving — it normalizes for list growth so you can see whether you're extracting more value per reader, not just more absolute revenue from a bigger audience.