# Brier Score

> Source: https://sukruyusufkaya.com/en/glossary/brier-score
> Updated: 2026-05-13T20:58:57.061Z
> Type: glossary
> Category: matematik-istatistik-optimizasyon
**TLDR:** A score that jointly evaluates the accuracy and calibration quality of probabilistic predictions.

<p>The Brier Score is a strong metric for evaluating classification models that produce probability estimates. It measures the squared difference between predicted probability and actual outcome. For that reason, it reflects both error magnitude and probability quality. It can be thought of as a bridge between calibration and accuracy. It is especially valuable in risk modeling, weather prediction, credit analysis, and classification problems where reliability matters. It evaluates not only whether the model is correct, but also how well it expresses its confidence.</p>