Spache可読性公式は、テキストを小学校低学年向けの親しみやすい単語リストと比較して採点。K-4向け読み物に最適。
日本語 向けではありません
このツールは英語（および関連言語）向けに調整されています。日本語 の結果は意味をなさない可能性があります。
Use Spache for any text aimed at K-4 readers — primary readers, beginning ESL, picture books, learn-to-read content. It's the formula educators most often request for grade 4 and below.
Spache and Dale-Chall both use familiar-words lists, but Spache targets younger readers (K-4) and Dale-Chall targets grades 4+. Use Spache for primary, Dale-Chall for everything else.
The Spache Readability Formula was developed in 1953 specifically for primary-grade text (K-4).
It scores against a list of approximately 1,000 words familiar to elementary readers, combined with sentence length: grade = 0.121 × avg sentence length + 0.082 × % unfamiliar + 0.659.
Best used to evaluate beginning readers, picture books, and ESL primary material. Above grade 4, switch to Dale-Chall.
Spache for K-4 reading material. Dale-Chall for grade 4+. They use different familiar-words lists.
The Spache list dates to 1953 — modern children's vocabulary may not match. Suffix stripping helps but isn't perfect.
Grade 1-2 for early readers, 3-4 for primary independent reading. Above grade 4, use a different formula.
入力
"The dog ran fast across the green field."
出力
Spache grade 1.4 — primary.
All eight words are in the Spache familiar-words list and the sentence is short. Suitable for grade 1–2 readers.