How the chemistry communities compare
Membership is concentrated: the three largest communities hold 97% of all members on this list, so most of the chemistry conversation happens in a handful of places. r/chemistry is both the biggest and the busiest, with about 29 new posts a day. Per member, the liveliest is r/chemhelp: 14 posts a day from 88.9K members — a smaller crowd, but an engaged one. The oldest is r/chemistry, founded in 2008, and every community here is more than five years old — this is a long-established corner of Reddit.
5 chemistry subreddits by member count
r/chemistry 3,887,915 members · ~29 posts/day · +890 since Oct 26 · since 2008A community for chemists and those who love chemistry
- Cr/chemistrymemes ↗ 108,867 members · ~4.7 posts/day · since 2017
The Alchemist's Meme Lab A subreddit where science meets silliness! Dive into a bubbling cauldron of periodic puns, reaction-related roasts, and lab-life laughs. Whether you’re bonding over titration troubles, cracking up at expl…
- Or/OrganicChemistry ↗ 93,684 members · ~8.1 posts/day · since 2009
Synthetic Organic Chemistry
- Cr/chemhelp ↗ 88,865 members · ~14 posts/day · since 2010
r/chemhelp has made the decision to go dark in light of recently announced reddit API changes. To follow news of the blackout, please check here: https://www.reddit.com/r/ModCoord/comments/1476fkn/reddit_blackout_2023_save_3rd_pa…
- Cr/cursed_chemistry ↗ 28,146 members · ~0.9 posts/day · since 2019
Featuring severe steric strain
Choosing where to post
For beginner questions, r/chemhelp is the natural first stop — it exists for advice, and roughly 14 new threads a day keep it moving. Asking the same thing in r/chemistry often gets it removed or lost among the 29 daily posts. Jokes and memes have their own home in r/chemistrymemes; the serious communities tend to remove them, so keep the two apart.
A simple rule of thumb: ask questions in the specialised communities and share your best finds in the big ones, where they can reach the most people. Always read the rules in the sidebar first — each community is run by its own volunteer moderators. Our guide to searching Reddit explains how to dig through any of these communities, and the subreddit info tool gives you the stats of one we don't list.
Frequently asked questions
Which chemistry subreddit has the most members?
Of the communities listed here, r/chemistry is the largest, with 3,887,915 members, followed by r/chemistrymemes (108.9K) and r/OrganicChemistry (93.7K).
Where are the most new chemistry posts?
By new posts per day, r/chemistry leads with about 29, ahead of r/chemhelp (14). Counts are averages over the last seven days.
Which chemistry subreddit is best for questions?
r/chemhelp is the one built around questions and advice, with about 14 new posts a day. Check its rules and search it first — common questions have usually been answered.
How many chemistry communities are on this list?
We list 5 safe-for-work chemistry communities with at least 25,000 members each, 4.2M members in total (people can be in several). Reddit has many smaller ones too; our guide on searching Reddit shows how to find them.
What is the oldest chemistry subreddit?
r/chemistry, created on Mar 13, 2008.
Are these chemistry subreddits safe for work?
Yes. Every community on this page is public and not marked 18+ by Reddit, and we filter out communities whose name or description points to adult content.
Data: Reddit's public subreddit search and the Arctic Shift archive (Nov 7, 2026), growth from SubMouse's weekly snapshots. Member counts of communities outside our Top 1000 come from the archive and can lag a little. Not affiliated with Reddit.