r/chemistry
Reddit Chemistry - Read the sidebar
Founded March 2008 · Public — anyone can post
A community for chemists and those who love chemistry
Members
3,884,089
3.9M
Online now
—
not captured in the last snapshot
Posts per day
—
no sample yet
Comments per post
—
no sample yet
Growth · 7d
—
not enough history yet
Growth · 30d
+0.1%
+4.3K members · ≈28d
Published rules
10
2 mention promotion — quoted below
Last post
—
no sample yet
Distinct posters
—
no sample yet
Tracking since Sep 5 · growth spans are the real distance between snapshots, not rounded windows. Posts/day is measured from the community’s own newest posts on Reddit, not from what Prowlo happens to crawl.
Member growth
What works in r/chemistry
Every post in a recent sample, labelled by format. Share is how much of the sample used that format; average score is how it performed.
| Format | Share of posts | Avg score |
|---|---|---|
| Question | 48% | 1,141 |
| Show & tell | 17% | 3,102 |
| Discussion | 13% | 2,464 |
| News / link | 10% | 2,564 |
| Lessons / story | 6% | 1,763 |
| Rant | 3% | 1,687 |
| Promo | 3% | 875 |
Based on 69 posts sampled in September 2026. A sample, not the full history.
- Median score
- 603
- Top 10% score
- 4,037
- Text posts
- 22%
- Got no replies
- 3%
- Busiest windows
- Wed 01:00 UTC, Mon 18:00 UTC
Posting rules, in plain words
Self-promotion is judged case by case.
- (Self-) Promotion: If you want to promote something, be it an App, Website, Tutoring Course, Helpful Tool or even a PhD-Position, send a mod mail first. Failure to do so will result in the post being removed. Sharing Scientific Papers, both your own and ones you find interesting is always allowed, but we'd ask that you give a synopsis and explain, why you feel it's relevant to this subreddit.
Quoted from the community’s own published rules. Always re-read them before posting.
What a good comment looks like here
- — Provides direct, scientifically accurate answers or explanations.
- — Shares relevant personal experiences or anecdotes.
- — Offers practical safety advice.
- — Uses humor or wit, often with chemistry-related puns.
- — References established scientific principles or literature.
- — Engages in constructive debate or clarification.
What r/chemistry's rules say about promotion
2 of 10 published rules mention promotion, advertising or spam. Quoted from the community's own rules page, not summarised.
ChatGPT and AI Chemistry
rule 7 of 10
No "AI Bad at Chemistry" posts. Discussion around the positive usage of artificial intelligence in the field of chemistry is permitted. However, you should be aware of the limits of specific AI models and shouldn't follow synthesis routes they present without an understanding of the underlying chemistry. Additionally, job advertising posts for training AI/LLM-Models are explicitly banned.
Removal reason shown to posters: Unsafe use of Artificial Intelligence for Chemistry
(Self-) Promotion
rule 10 of 10
If you want to promote something, be it an App, Website, Tutoring Course, Helpful Tool or even a PhD-Position, send a mod mail first. Failure to do so will result in the post being removed. Sharing Scientific Papers, both your own and ones you find interesting is always allowed, but we'd ask that you give a synopsis and explain, why you feel it's relevant to this subreddit. Posts that have been approved by moderation will have a pinned comment by a member of the mod team denoting them as such.
The other 8
- Classwork, Homework, Exam, And Lab Questions
- Undergraduate and High School Chemistry
- Nefarious deeds
- Being a Jerk
- NSFW
- Zero-content material
- Medical Advice, Spills, Contamination and Mixing of Chemicals (e.g. Cleaning Agents)
- Use appropriate Megathreads
Read from r/chemistry’s published rules on Sep 5. Communities change their rules without notice and enforce requirements (karma, account age, flair) that may live in the sidebar or automod rather than here — the source page is the authority.
Similar by content
Communities that discuss what r/chemistry discusses.
See the full lists on similar subreddits.
r/chemistry — frequently asked
How many members does r/chemistry have?
r/chemistry has 3,884,089 members as of our most recent crawl on Oct 3. Prowlo re-checks tracked communities on a rolling schedule, so this figure moves rather than sitting frozen at whatever it was when a scraper last ran.
Is r/chemistry growing?
Over the last ≈28 days r/chemistry changed by +0.1% — a gain of 4.3K members. We compare against the nearest snapshot we actually hold and state the real span rather than rounding it to a clean "30 days".
How active is r/chemistry?
We don't have a reliable posting-rate sample for r/chemistry yet. Subscriber count alone is a poor guide to whether a community is active, so treat this one as unverified until the next sample lands.
When was r/chemistry created?
r/chemistry was founded in March 2008 and is a public — anyone can post community. Age matters: an older community with steady growth has survived Reddit's moderation churn; a young one with a spike may not.
Can I promote my product in r/chemistry?
r/chemistry publishes 10 rules and 2 of them address promotion. The first, “ChatGPT and AI Chemistry”, says: No "AI Bad at Chemistry" posts. Discussion around the positive usage of artificial intelligence in the field of chemistry is permitted. However, you should be aware of the limits of specific AI models and shouldn't… Read the full rule text on this page and the community's rules page before posting — moderator enforcement is the thing that actually decides.
How do I monitor r/chemistry for mentions?
Hit Watch on this page. Prowlo starts crawling r/chemistry into your Dataset — every new post indexed and embedded, searchable semantically, queryable by your AI agent over MCP, and able to trigger keyword alerts in Slack. Prowlo is read-only; it never posts on your behalf.
Can my AI agent read r/chemistry's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/chemistry's members, growth, promo tolerance and similar communities as typed JSON — free, no credits. Connect your agent to api.prowlo.com/mcp and it can vet the community and start watching it in the same conversation.
Read-only · Human-in-the-loop
Prowlo never posts for you
More free Prowlo tools
Subreddit Finder
Find subreddits by describing your product
Similar Subreddits
Discover related communities
Top Subreddits
The biggest communities we track
Reddit Search Builder
Operators, users, flair and dates
AI Writing Checker
Spot the tells before you post
Comment Humanizer
Make AI comments sound human
Reddit MCP Server
Give your AI agent Reddit access