BLEU Score Calculator
Evaluate machine translation quality using the industry-standard BLEU metric
Example Translations
Simple sentence variation
Shows how BLEU handles simple word variations and different sentence structures.
Synonym substitution
Demonstrates BLEU's behavior with synonyms and paraphrasing.
Different phrasing
Illustrates how BLEU scores different ways of expressing the same meaning.
Translation Input
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Understanding BLEU Score
BLEU (Bilingual Evaluation Understudy) is an algorithm for evaluating machine translation quality. It works by comparing a candidate translation against one or more reference translations.
How It Works
BLEU calculates the similarity between translations using n-grams (consecutive word sequences). It considers both precision (matching n-grams) and a brevity penalty for short translations.
Best Practices
For best results, use multiple reference translations when available. Consider that BLEU works best with larger texts and may not perfectly capture semantic equivalence.