21 Online Communities for Forecasters
Updated 10/28/2026
Metaculus Discord
on discord
The official Metaculus Discord server for discussing forecasts, prediction methodology, and community tournaments.Chat25 views / month
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Polymarket
A decentralized prediction market platform on Polygon where users trade on real-world event outcomes using USDC.30K members
ForumChat20 views / month

r/predictionmarkets
on reddit
A community for discussing the power of prediction markets. Talk all things forecasting, futarchy and betting on beliefs. Polymarket, Kalshi, PredictIt, Manifold Markets, Smarkets and more!14K members
Forum28 views / month

r/forecasting
on reddit
The art and science of making numerical predictions and later checking their accuracy and calibration to test and improve your models of the world941 members
Forum12 views / month
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Long Now Foundation
An organization focused on long-term thinking and forecasting, with a forum for discussing long-range predictions and trends.ForumEvents
Forecasting Discord
on discord
A Discord server dedicated to forecasting, prediction markets, and improving probabilistic thinking through collaborative discussion.Chat14 views / month
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Foresight Institute Forum
A forecasting and futures studies community focused on emerging technologies, long-term prediction, and strategic foresight.ForumEvents9 views / month

r/SampleSize
on reddit
A place for surveys and polls to be posted. Research studies for school purposes are welcome as well as opinion polls We are also a place for people who enjoy responding to surveys to gather and help people obtain responses for their research. Questions about a mild level of statistics or wording of surveys are also permitted.272K members
Forum![Community Placeholder]()
Metaculus
A prediction platform where users make and evaluate forecasts about future events across science, tech, politics, and more.20K members
ForumChat![Community Placeholder]()
Manifold Markets
A prediction market platform where users trade on the outcomes of future events using play money and real rewards.15K members
Forum10 views / month
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Good Judgment Open
A forecasting platform from the Good Judgment Project where users answer geopolitical and economic forecasting questions and track their accuracy.10K members
Forum![Community Placeholder]()
PredictIt
A real-money prediction market platform where users trade shares in the outcomes of political and current events.50K members
Forum![Community Placeholder]()
Kalshi
A regulated event contract exchange where users can bet on the outcomes of economic and political events within CFTC oversight.Forum![Community Placeholder]()
LessWrong
A community blog and forum dedicated to rationality, Bayesian reasoning, and improving forecasting skills through discussion and debate.25K members
Forum12 views / month
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Astral Codex Ten
A community blog and forum focused on forecasting, rationality, AI safety, and prediction markets as a tool for truth-seeking.5K members
Forum
r/cognitivebias
on reddit
Reddit community discussing cognitive biases and debiasing techniques relevant to improving forecasting accuracy.360 members
Forum9 views / month

r/rational
on reddit
A place for discussion of rational fiction.29K members
Forum![Community Placeholder]()
Machine Intelligence Research Institute
MIRI hosts discussions on AI forecasting and existential risk prediction, with an active research community.Forum
r/futurology
on reddit
A subreddit devoted to the field of Future(s) Studies and evidence-based speculation about the development of humanity, technology, and civilization. -------- You can also find us in the fediverse at - https://futurology.today21.7M members
Forum
Poly Research & Robotics
on discord
Poly Research & Robotics is a research collective and toolset for people building automated trading bots on prediction markets, primarily Polymarket. Free Discord community, bot-building guides, trader reports, and historical order-book / TWAP datasets.Chat26 views / month

DeskBot HQ
on telegram
DeskBot HQ is a Telegram group for people trading Kalshi's 15-minute event markets and using desktop automation to do it. Members swap notes on market structure, fees and breakeven, paper-mode testing, and setup questions for the DeskBot app. Discussion is about trading, not tips or signals, and nobody promises results; trading can lose money. Not affiliated with Kalshi.30 members
Chat12 views / month
FAQ
Community size
- Tiny: 0 communities (<20 members)
- Small: 1 communities (20-100 members)
- Medium: 2 communities (100-1,000 members)
- Large: 1 communities (1,000-10,000 members)
- Huge: 8 communities (10,000-100,000 members)
- Massive: 1 communities (100,000-1M members)
- Gigantic: 1 communities (1M+ members)
Community features
Community platforms
- Reddit: 6 communities
- Discord: 3 communities
- Telegram: 1 communities
