r/Physics↗
For physicists and physics students. See the rules before posting, and the subreddit wiki for common questions. Basic homework questions are not allowed.
3.3M subscribers600 posts / mo in Sep 2026 (incl. ~2% by known bots)512 authors / mosince 2008
r/Physics has 3.3M members (+2.5% over the last 12 months). It gets about 600 posts a month from 512 people. Top topics: Physics Books, Physics Exams & Study and Space & Physics Engineering.
When to post on r/Physics
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How r/Physics has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/Physics
Top topics
Share of the subreddit's posts
- Physics Books0.9%
- Physics Exams & Study0.9%
- Space & Physics Engineering0.5%
- Dark Matter Mysteries0.4%
- Big Bang Theory0.4%
Brands people mention
Most-mentioned brands and sites, last 12 months
- arXiv.org e-Print archive
- Doi
- Zenodo
- American Physical Society
- Nature
Everything else about r/Physics
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research