BM25F calculator
Enter a query and field values to see how BM25F field weights change ranking.
BM25F calculator for fielded search
The BM25F calculator helps debug fielded search when title, body, and tag matches should not count equally. Use it to compare BM25F scoring and see how each field contributes to the final score. Field-aware scoring is useful when a title match should matter more than a body match, or when tag matches need their own weight. Run the calculator again after changing weights so the output shows which field changed the ranking.
BM25F calculator fields
Enter title, body, and tags in the BM25F calculator to model fielded search from a real index.
Fielded BM25 weights
Change title, body, and tag weights to see how BM25F shifts field-aware ranking.
Field weights ranking view
Compare total score and field contribution in the BM25F calculator to understand field weights.
How to use BM25F calculator
Use it in three steps.
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01
Enter the search query.
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02
Fill title, body, and tag fields.
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03
Adjust field weights and compare total score with field contribution.
Field weights
How the fields are weighted.
Title
Title matches use the highest default weight, so the BM25F calculator can show how title matches shift fielded search ranking.
Body
Body text uses the baseline weight for BM25F, which keeps long content comparable while field weights change around it.
Tags
Tags use a metadata weight between title and body by default, giving the BM25F calculator a compact signal for fielded search comparisons.
BM25F calculator FAQ
What is BM25F?
BM25F is a field-aware version of BM25 that scores fields such as title, body, and tags separately before combining them.
How is BM25F different from BM25?
BM25 usually treats a document as one text field, while BM25F lets different fields carry different weights. The BM25F calculator makes the field-weight difference visible.
What are field weights?
Field weights decide how much matches in title, body, tags, or other fields contribute to the final score.
Is BM25F semantic search?
No. BM25F is still lexical keyword scoring, but it accounts for field structure.
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