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Fig. 1 — a perfect score

0.000The Brier score of a forecaster who is never wrong.

Nobody gets there. But you can try. Forecast against friends and strangers on sports, world politics, and even your personal life.

Fig. 2 — 56%, give or take

How scoring works

Your forecastDid it happen?Penalty
100%Yes0.000(1.00 − 1)²
50%Yes0.250(0.50 − 1)²
90%No0.810(0.90 − 0)²
100%No1.000(1.00 − 0)²

Penalty = (forecast − outcome)² · yes = 1, no = 0

You called it?

Not unless you recorded it on Haruspex.

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