The grade level is 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59; the Flesch reading ease score is shown alongside. Syllables are estimated from vowel groups, so results can differ slightly from tools that use a pronunciation dictionary. The cat sat on the mat. has 6 words, 1 sentence and 6 syllables, a grade level of -1.4.