Unverified50% confidenceFactExact time
The WER formula is WER = (S + D + I) / N, where S is the number of substitutions, D the number of deletions, I the number of insertions, and N the total number of words in the reference transcription.
1
Sources
50%
Confidence
Long-term
Relevance
10/22/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedCER = (S + D + I) / N, where S is substitutions, D is deletions, I is insertions, and N is the total number of characters in the reference answer.78% similarVerifiedWord Error Rate (WER) is calculated by dividing the sum of substitution, deletion, and insertion errors between the recognition output and the reference text by the total number of words in the reference text.68% similarUnverifiedWER is calculated as (number of substituted words + number of deleted words + number of inserted words) / total number of reference words, and is extremely sensitive to text formatting (case, punctuation, abbreviations, spelling variants), so normalization is usually required before evaluation.65% similarUnverifiedWER treats all word errors equally, applying the same penalty regardless of whether the error involves a function word or a key entity word.56% similarUnverifiedModern compilers and high-performance libraries convert division by a constant into multiplication by a magic constant followed by a right shift—that is, for division by constant d, a large integer M and shift amount s are found such that ⌊n/d⌋ = ⌊n×M / 2^s⌋.55% similar
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