About r/math
In its own words:
This subreddit is for discussion of mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.
Community guide
r/math (#239, about 4 million) is for discussion of mathematics—including practice, profession, and community topics. Rules require on-topic posts, discussion-sparking questions, and ban homework problems, career/education questions, and low-effort image/video posts; be excellent to each other. Text (~28.4 ppd).
Not a homework help desk
Homework problems are removed. Career or education-path questions are also out—keep to mathematical discussion.
Questions that spark discussion
Questions should invite discussion, not one-line answer checks. Low-effort image/video posts are banned.
Practical pointers
Stay on-topic; be excellent to each other.
SubMouse Editorial
The community was created on Jan 24, 2008, which makes it 18 years old. Since Oct 26, 2026, it has gained 1,044 subscribers (+0.03%). It sits just behind r/gameofthrones (#238) and ahead of r/Fantasy (#240) in our ranking.
What sets r/math apart
r/math is far more text-driven than most big subreddits: 72% of its recent posts are text posts, against a median of 34% across the Top 100. Its rhythm is strongly tied to time zones: the busiest hour (19:00 UTC) sees about 6.0× as many posts as the quietest (08:00 UTC).
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/math went up from 3,970,692 to 3,977,563 subscribers (+6.9K, +0.17%). That is about 156 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/math talks about
Looking at the titles of 169 recent posts (Oct 29–Nov 5), the words that come up most are “number”, “mathematics”, “proof”, “help” and “question”. Other frequent themes are maths, conjecture, came, hodge, complex and problem. Recurring phrases include “generate rational”, “rational approximations”, “square root” and “rational number”. By format, 72% are text posts, 15% are images and 5% are links.
Popular post flairs: LLMs/AI (6), Removed - add explanation (4), Image Post (2), Removed - try /r/learnmath (1), Removed - try /r/theydidthemath (1).
Activity and best time to post
r/math gets about 28 new posts a day. The public archive holds 337,948 posts and 2,954,545 comments in total, about 8.7 comments per post. Last week the busiest day was Thursday (36 posts) and the quietest was Saturday (20). Posting peaks around 19:00 UTC and is lowest around 08:00 UTC.
Rules of r/math
The moderators of r/math list 6 rules. In short:
- Stay on-topic
- Questions should spark discussion
- No homework problems
- No career or education related questions
- No low-effort image/video posts
- Be excellent to each other
How to join
Open reddit.com/r/math and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How big is r/math?
r/math has 3,977,563 subscribers (Nov 2, 2026), which makes it the #239 safe-for-work subreddit in the SubMouse ranking. It added 6,871 members between Sep 19, 2026 and Nov 2, 2026.
When was r/math created?
r/math was created on Jan 24, 2008, so it has been around for 18 years.
Is r/math still active?
Yes. r/math gets about 28 new posts a day (average of the last four weeks). Over its lifetime the archive counts 337,948 posts and 2,954,545 comments. In a sample of 169 recent posts we counted 151 different authors.
What is the best time to post in r/math?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Thursday and the quietest Saturday, and most posts arrive around 19:00 UTC, with the fewest around 08:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What kind of posts are on r/math?
The community describes itself as: “This subreddit is for discussion of mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.” Recent post titles often mention number, mathematics, proof, help and question. Most posts are text posts (72%).
Is r/math SFW?
Yes. Reddit does not mark r/math as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/math?
Join the community on Reddit first, then use “Create post”. r/math accepts both text and link posts, with images and galleries enabled. It has 6 posted rules, starting with: “Stay on-topic”; “Questions should spark discussion”; “No homework problems”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/math?
Communities with similar topics include r/theydidthemath (2.5M), r/Meditation (3.6M), r/cursedcomments (3.3M), r/nflmemes (1.2M) and r/bestof (5.4M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/math.