The 9:1 Self-Promotion Rule is Reddit's community-cited ratio for self-promotion: for every promotional post you contribute, you should contribute nine non-promotional ones. Phrased as both "9:1" and "90:10," it appears in 📝Reddit's official self-promotion wiki and is cited by individual 📝subreddit rules across the platform. Some communities enforce stricter ratios — 95:5 or "no self-promotion ever" — but 9:1 is the floor most subreddits use as default.
What the Rule Actually Says
Reddit's wiki phrases the rule as a heuristic, not a hard count. A Redditor whose contribution history is mostly something other than their own work is welcomed, even if some posts are self-promotional. A Redditor whose history is mostly self-promotion is treated as spam, even if individual posts are high-quality. The number 9:1 is the threshold most communities mentally apply.
The rule is about history, not scheduling. Reddit and its 📝Moderators look at your account's entire posting pattern, not the gap between your last promotional post and the next one.
Why 9:1 Works as a Community Norm
The ratio is high enough to ensure substantive participation. A brand that publishes nine non-promotional contributions for every promotional one has, by definition, become useful to the community before extracting from it. The rule encodes a culture of reciprocity — the same dynamic that makes 📝Authentic Contribution work.
A brand that treats 9:1 as a content calendar — "publish nine helpful posts to earn the right to promote" — is gameable and Reddit detects it. The fingerprint of manufactured contribution (posts on a schedule, posts only in subreddits where the product fits, low engagement on the non-promotional content) is exactly what Reddit's anti-spam systems target.
How Subreddits Enforce It
Reddit site-wide treats 9:1 as a guideline. Individual subreddits enforce it as a rule, and many publish stricter versions:
- Some require N-day participation before any link post is allowed
- Some ban all self-promotion regardless of ratio
- Some allow self-promotion only in designated weekly threads
- Some apply automod filters that block any URL outside an allowlist
Always read the subreddit sidebar before contributing. Sidebar rules are stricter than site-wide rules — never looser.
Related
For Reddit's full official self-promotion policy, see 📝Self-Promotion. For the brand-specific application, see 📝Reddiquette for Brands. For how Reddit and its communities draw the line between contribution and spam, see 📝Self-Promotion vs. Spam: How Reddit Distinguishes.