r/AskPhysics has 1.6M members (+4.7% over the last 12 months). It gets about 1,284 posts a month from 1,027 people. Top topics: Physics Exams & Study, Big Bang Theory and Space & Physics Engineering.
When to post on r/AskPhysics
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How r/AskPhysics has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/AskPhysics
Top topics
Share of the subreddit's posts
- Physics Exams & Study0.8%
- Big Bang Theory0.7%
- Space & Physics Engineering0.6%
- Physics Books0.5%
- Solar System Scale & Planets0.2%
Brands people mention
Most-mentioned brands and sites, last 12 months
- arXiv.org e-Print archive
- Massachusetts Institute of Technology
- Stack Exchange
- The Theoretical Minimum
- Doi
Everything else about r/AskPhysics
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