Is An AUC Of 0.5 Good

By Trading Automation 07 August 2026

Visitors exploring Is An AUC Of 0.5 Good often look for quick and useful information. This Trading guide is designed to answer common questions. Through the information on this page, you can further explore the subject.

No, an AUC (Area Under the Curve) of 0.5 is not good because it means your model has no predictive power and performs no better than random guessing or a coin flip. 

What an AUC of 0.5 Means

• Random Chance: The model cannot distinguish between positive and negative classes.
• Equal Probability: There is a 50% chance that the model ranks a randomly chosen positive instance higher than a negative instance.
• No Utility: The model is useless for practical prediction or classification tasks. 

General AUC Score Guidelines

As a general rule of thumb, you can evaluate model performance using these ranges: 

• 0.5: No discrimination (random guessing)
• 0.5 – 0.7: Poor discrimination
• 0.7 – 0.8: Acceptable discrimination
• 0.8 – 0.9: Excellent discrimination
• > 0.9: Outstanding discrimination 

For more detailed breakdowns on metric evaluation, check out the guide on . 

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