Metaculus Platform Guide (2026)
Metaculus is the leading non-monetary forecasting platform — 1,000+ questions, a rigorous calibration scoring system, public API, and no real money at stake. Here's how it works, who uses it, and how it compares to real-money prediction markets.
Cost
Free
Markets
1000+
US Legal
All states
API
Public
Our Take
Metaculus occupies a unique position: it's the best platform for building and demonstrating forecasting track records without financial risk. If you want to develop prediction market skills, practice calibration, or contribute to research-grade forecasting, Metaculus is excellent. If you want to profit financially from your forecasting edge, you'll need a real-money platform like Kalshi or Polymarket. Many serious forecasters use both — Metaculus to sharpen skills and track records, real-money platforms to capitalize on them.
Key Strengths
Completely free — no money at stake
No deposits, no fees, no financial risk. Participate from any US state (or anywhere in the world) without regulatory restrictions.
Rigorous calibration scoring
The logarithmic scoring system rewards accurate probability assessment, not just binary correctness. It's the gold standard for measuring forecasting skill.
Builds a verifiable track record
Your historical forecasting accuracy is public and auditable. Serious forecasters use Metaculus records to demonstrate skill to employers, researchers, and trading firms.
1,000+ diverse questions
1000+ questions spanning science, AI, politics, economics, health, and more — including long-horizon questions that real-money markets rarely cover.
Public API access
Metaculus provides a public API for accessing question data, forecasts, and historical results. Widely used in academic research on forecasting and crowd wisdom.
Community and tournaments
Active forecasting community with organized tournaments, research-sponsored challenges, and leaderboards based on calibration rather than luck.
Key Considerations
No financial upside
The core limitation: you cannot profit from being right. For traders who want returns on their forecasting edge, real-money platforms are necessary.
No cash value or payouts
Metaculus is a reputation and forecasting platform, not a trading venue. Its scoring system is useful for track records, but it does not pay cash returns or create redeemable balances.
No mobile app
No dedicated mobile app — mobile web experience only.
Different skill set than trading
Being a great calibrated forecaster doesn't automatically translate to being a great real-money prediction market trader. Liquidity, position sizing, and market mechanics are separate skills.
Resolution timelines can be long
Some Metaculus questions have resolution dates years in the future. The platform is better for long-horizon forecasting than the weekly/monthly timeframes of most real-money markets.
Compare Platforms
See how Metaculus stacks up
What Is Metaculus?
Non-monetary forecasting platform overview
Metaculus is a non-monetary forecasting platform where participants make probability estimates on real-world questions — without any financial stakes. Unlike real-money prediction markets, users earn Metaculus Points (MP) based on how well-calibrated their predictions are.
The platform hosts 1000+ questions across science, AI, politics, economics, health, and more. Participants — from students to professional researchers — submit probability estimates, and the platform aggregates them into a community forecast — you can compare Metaculus accuracy to real-money exchanges using public resolution data. After events resolve, everyone's score is updated based on accuracy.
Because no real money changes hands, Metaculus is available in all US states and internationally without legal restrictions. It's free to use, no deposit required, and open to anyone.
No deposit, no fees, no financial risk
No legal restrictions — open globally
Active and historical forecasting questions
How Metaculus Scoring Works
Logarithmic calibration scoring explained
Metaculus uses a scoring system centered on Baseline and Peer scores, with Relative scores still used in some tournaments. The system is designed to reward calibration: the alignment between your stated confidence and the actual frequency of outcomes.
The Key Insight: Confidence Matters
A well-calibrated forecaster:
- Says 90% on things that happen ~90% of the time
- Says 30% on things that happen ~30% of the time
- Never says 99% unless truly certain
A poorly-calibrated forecaster:
- Always says 90%+ on things they don't really know
- Gets penalized heavily when wrong at high confidence
- Under-represents uncertainty systematically
Scoring Examples
You forecast 85% for an event that happens
High confidence on a correct outcome earns strong positive points.
You forecast 50% for an event that happens
A 50% forecast means 'I don't know' — you're not penalized or rewarded much.
You forecast 15% for an event that happens
Being confidently wrong (15% confident on something that happened) earns a negative score.
You forecast 95% for an event that happens
Maximum reward for being very confident on something that actually occurred.
Why Logarithmic Scoring Beats Binary
Binary scoring ("right or wrong") rewards reckless confidence. Logarithmic scoring is calibration-aware: the optimal strategy is always to report your honest probability estimate. There's no incentive to game the system by over- or under-stating confidence. This is why Metaculus scores are trusted by researchers as reliable forecasting measures.
Question Categories
Topics covered on the platform
Metaculus covers a broader range of topics than most real-money prediction markets, including long-horizon questions and research-grade topics that financial markets rarely cover.
Science & Technology
- AI milestones
- Climate targets
- Space missions
- Biotech breakthroughs
Politics & Geopolitics
- Election outcomes
- Policy decisions
- International relations
- Conflict outcomes
Economics & Finance
- Recession probability
- Central bank decisions
- Market milestones
- Employment data
Health & Medicine
- Disease spread
- FDA approvals
- Clinical trial outcomes
- Pandemic forecasts
Metaculus Tournaments
- Forecasting championships
- Research-sponsored tournaments
- Accuracy competitions
- Community challenges
AI Forecasting
- Model capability benchmarks
- AI safety milestones
- Deployment timelines
- Research breakthroughs
Who Uses Metaculus?
Core community and use cases
Metaculus serves a different audience than real-money prediction markets. The core community includes researchers, policy professionals, and serious forecasters who prioritize track record quality over financial returns.
Academic Researchers
Metaculus questions and forecasting data are used in peer-reviewed research on crowd wisdom, calibration, and forecasting accuracy. The public API makes large-scale analysis straightforward.
Policy Professionals
Government analysts, think tank researchers, and NGO policy teams use Metaculus for structured scenario analysis and to track forecasting consensus on policy-relevant questions.
AI Safety Researchers
Metaculus has become a major hub for AI capability and safety forecasting — tracking milestones like model performance benchmarks, deployment timelines, and safety-relevant events.
Competitive Forecasters
Serious forecasters use Metaculus to build a verifiable public track record — useful for demonstrating forecasting skill to employers, grant committees, or research collaborators.
Forecasting Learners
People learning forecasting use Metaculus as a risk-free training ground. The scoring system provides genuine feedback on calibration without any financial consequences for mistakes.
Prediction Market Traders
Real-money prediction market traders use Metaculus to practice calibration and validate their probability estimates before deploying capital on Kalshi or Polymarket.
Public API & Research Access
Data access for researchers and developers
One of Metaculus's major advantages for researchers and serious forecasters is its public API. Unlike most prediction marketprediction market platforms where data access is gated, Metaculus's historical forecasting data is openly accessible.
Question Data
Access full question details, resolution criteria, current community forecasts, and historical forecast distributions.
Historical Forecasts
Retrieve historical forecast trajectories — how the community prediction changed over time as new information became available.
Resolution Outcomes
Access resolution data for completed questions — enabling large-scale calibration analysis and retrospective accuracy studies.
Research Use Case
Several published academic papers have used Metaculus data to study forecasting accuracy, information aggregation, and superforecasting. The platform's calibration scores and resolution data provide a unique dataset for studying crowd wisdom at scale.
How to Get Started on Metaculus
Step-by-step onboarding guide
Create a Free Account
Visit metaculus.com and sign up with an email address. No deposit, no KYC — just email verification.
Explore Questions
Browse the question list by category. Start with topics you know well. Each question has resolution criteria, background context, and current community forecasts.
Make Your First Forecast
Select a question and submit a probability estimate (0–100%). The interface shows the current community median so you can compare your view.
Update as New Information Arrives
One of Metaculus's key features: you can update your forecast as events develop. Revising your estimate when new information arrives is rewarded, not penalized.
Wait for Resolution
When the question's resolution date arrives and the outcome is known, your score is updated. The platform tracks your historical accuracy across all your forecasts.
Build Your Track Record
Over time, your calibration score — measuring how well-aligned your stated probabilities are with actual outcomes — becomes your forecasting credential.
Metaculus vs Kalshi vs Polymarket
Side-by-side platform comparison
Metaculus and real-money platforms aren't competitors — they serve different purposes. Many serious forecasters use all three.
| Feature | Metaculus | Kalshi |
|---|---|---|
| Real Money | No (reputation points only) | Yes (USD / USDC) |
| Regulation | Not regulated (reputation-based forecasting platform, no real money) | CFTC-regulated DCM + DCO (Designated Contract Market and Derivatives Clearing Organization) |
| US Legal | Nationwide | Most states |
| Fees | Free | ≤1.75¢/contract (formula-based) |
| Market Count | 1000+ | 500+ |
| Scoring System | Logarithmic calibration score | P&L (profit/loss) |
| API Access | Yes (public API) | Yes |
| Mobile App | Mobile-responsive web | Yes |
| Min Deposit | Free | $1 |
| Best For | Calibration practice, track records, research | Regulated US event contract trading |
The Power User Strategy
Many top forecasters use Metaculus to build and validate their probability estimates, then trade those same questions on Kalshi or Polymarket when the market price diverges from their Metaculus forecast. The non-monetary practice sharpens the skill; the real-money markets monetize it.
Who Should Use Metaculus?
Best-fit audience assessment
Best For
People building forecasting skills
Metaculus is the best risk-free training ground for calibration. You get real feedback on your probability estimates with zero financial downside.
Researchers needing a track record
A public Metaculus calibration score is a verifiable credential. Useful for academic researchers, forecasting tournaments, and quantitative roles.
Prediction market traders wanting practice
If you want to trade real money on Kalshi, Metaculus is where you sharpen your probability estimates before committing capital.
Anyone in a state without prediction market access
No state restrictions — Metaculus is accessible everywhere in the US and internationally.
Not Ideal For
Traders seeking financial returns
Metaculus Points have no monetary value. If you want to profit from forecasting skill, use Kalshi or Polymarket.
Short-term event traders
Metaculus questions often have weeks or months to resolution. For trading 24-hour news cycles, real-money platforms with fast-resolving markets are better.
Mobile-first users
No dedicated mobile app — the experience is primarily web-based.
Sports market traders
Sports questions exist on Metaculus, but real-money sports market platforms (FanDuel, DraftKings, Kalshi) have far better sports coverage.
Sources & References
Last updated: March 2026. Informational only — not financial advice.
Frequently Asked Questions
6 common questions answered
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