Metaculus

What Metaculus is, and what it is not

Metaculus is an online forecasting platform and aggregation engine, founded in 2015 and based in Santa Cruz, California. Its purpose is to improve collective reasoning on questions of consequence, from science and technology to economics and world events. Where a money exchange lets you buy and sell a contract whose price moves like a probability, Metaculus asks you to do something quieter and, in its own way, more demanding: state your honest probability, write down why, and then live with the score when the question resolves.

That single difference, money versus reputation, shapes everything else about the platform. There is no order book, no bid and ask, no balance to fund or withdraw, and no house. On a question such as whether a named agency will report a particular figure by a given date, you submit a probability, the platform aggregates many forecasters into a community estimate, and when reality arrives you are scored on how close you were. The currency is a track record, built one resolved question at a time. It is best understood as a forecasting credential rather than a place to make money, which is exactly why it appeals to people who care about being right for the right reasons.

Metaculus supports several kinds of question. Binary questions ask whether a defined event will happen. Numeric and continuous questions ask you to give a full probability distribution over a range, for instance a figure or a count, rather than a single number. Date questions ask when something will occur. Conditional questions ask what you expect if some other event happens first. This range lets the platform pose precise, resolvable questions, which is the raw material that good scoring depends on. A vague question cannot be scored fairly, so careful question design is part of what Metaculus sells to the institutions that sponsor its work.

How the scoring works

Scoring is the heart of Metaculus, and it uses proper scoring rules, the family of rules designed so that your best move is always to report your true belief. Per the Metaculus scores documentation as of June 2026, the platform reports two main measures. A Baseline score compares your forecast against an impartial baseline, so it tells you whether you beat a naive reference. A Peer score compares you against all other forecasters on the same question, so it tells you whether you beat the room. Tournaments add a Relative score used to rank entrants for prizes. The older Metaculus points system is now treated as obsolete, though it is still computed and visible.

Accuracy across many forecasts is often summarized with a Brier score, a standard measure where you square the gap between your probability and the outcome, and lower is better. Metaculus has published strong figures here; its aggregated Metaculus Prediction recorded a Brier score of about 0.107 on a set of questions resolved by 2021, per Metaculus, where a lower number means greater accuracy. Numbers like that are a useful signal, but they describe the aggregate over time, not a promise about any single question, and the exact figure depends on which questions are counted. The honest reading is that the community aggregate has a good record, not that any individual forecast is guaranteed.

Two design choices reward genuine skill rather than noise. Forecasting earlier, before the consensus forms, generally counts for more, because an early correct call is harder than a late one. And updating as new information arrives is encouraged rather than penalized, because the goal is calibration over time, not a single lucky guess. The table below sets out the main measures and what each one is really telling you.

Tournaments, and where cash does enter

Although the everyday platform involves no money, money does appear in one specific place, and it is worth being precise about it because it is easy to misread. Metaculus runs tournaments, usually organized around a theme and often in collaboration with a nonprofit, a government body, or a company. Per the Metaculus FAQ as of June 2026, cash prizes and medals are awarded to the most accurate forecasters in many of these tournaments, with the prize pool divided according to forecasting performance. The more you forecast, and the more accurate you are, the larger the share you can receive.

The crucial distinction is the source of that money. You do not deposit funds, you do not buy a contract, and you cannot lose your own stake, because there is no stake. The prizes are funded by the sponsoring organization as a reward for accuracy, not paid out of other forecasters' losses. That makes a tournament closer to a skill competition than to trading. It also means there is no withdrawable balance in the way a money exchange has one; if you win a prize, it is paid to you as a prize. For anyone comparing Metaculus to a venue like a regulated exchange, this is the line that matters, and the comparison panel and table below lay it out plainly.

Regulation, custody, and risk

Because no money is staked or traded on the core platform, Metaculus is not a regulated exchange and is not overseen by the CFTC as a designated contract market, as of June 2026. That is not a gap in its compliance; it is a consequence of what it is. The regulatory framework that governs venues like Kalshi and other event contract exchanges exists to protect people who put money at risk. With no money at risk, that framework simply does not apply, which is why our guide to the role of the CFTC draws the line where it does.

The practical upside is real. There is no financial custody, so there is no exchange balance to be frozen, no withdrawal to be delayed, and no insolvency that could trap your funds, the kinds of concerns our pages on platform custody of funds and counterparty and exchange risk describe for money platforms. The trade off is that there is also no regulator to appeal to and no protected balance, because there is nothing financial to protect. If you join a sponsored tournament with a cash prize, read that tournament's own rules, since the prize terms and any eligibility limits are set per tournament rather than by a single platform wide policy.

Who Metaculus suits, and who it does not

Metaculus suits the person who wants to get better at forecasting and to prove it. If you care about calibration, enjoy reasoning through hard questions, and want a measured, public track record, it is one of the best places on the internet to build one. Researchers, analysts, students, and anyone who wants the discipline of writing down a probability and being scored on it will find the platform serious and rewarding. The community and the question quality are strengths, and the absence of money keeps the focus on accuracy rather than on chasing a return.

It will not suit the person who wants to trade. If your goal is to take a position with money, to enter and exit as a price moves, or to hedge a real exposure, Metaculus is not built for that and does not pretend to be. There is no liquidity to trade against and no contract to sell. For that, a regulated money exchange is the right tool, and our platform ratings compare those venues. A fair way to hold the two in mind is that Metaculus measures forecasting skill, while a money exchange lets you act on it. Many thoughtful people use a forecasting platform to sharpen judgment and a separate, regulated venue when they want to put money behind a view, only where it is legal for them to do so.

The verdict

Metaculus earns its place in this index as the clearest example of a forecasting platform rather than a market. Our illustrative score of 69 out of 100 reflects that split personality fairly: top marks on cost, because it is free, and strong marks on the rigor and transparency of its scoring, balanced against a regulation and trust score that is necessarily middling, since there is no regulator and no protected money, and a market selection score held back by the absence of continuous trading. None of those are flaws so much as the natural shape of a reputation based platform.

If you read the score as a measure of a money exchange, it will mislead you, because Metaculus is not trying to be one. Read instead for what it is, and the picture is clear: a free, rigorous, globally available place to forecast, with cash appearing only in sponsored tournaments and never out of your own pocket. For building and proving forecasting skill, it is excellent. For trading with real money, look to a regulated venue and confirm it is legal where you are first. Scores here are illustrative editorial examples, not investment advice.

Answered plainly.

How we assessed Metaculus

We assess every platform the same way: we research its regulatory basis, costs, funding, range of questions, and availability from primary sources, then score it. For this review we read the published Metaculus FAQ, the scores documentation, and the live tournaments listing in June 2026, rather than relying on second hand summaries. We do not take payment for a score or a place, and we update the page when the facts change. Read the full method on our editorial standards page.