Spache Readability Formula - Calculation

Calculation

The method compares words in a text to a set list of everyday words. The number of words per sentence and the percentage of unfamiliar words determine the reading age.

The original formula was:

\mbox{Grade Level} = \left ( 0.141 \times \mbox{Average sentence length} \right ) + \left ( 0.086 \times \mbox{Number of unique unfamiliar words} \right) + 0.839

The revised formula is:

\mbox{Grade Level} = \left ( 0.121 \times \mbox{Average sentence length} \right ) + \left ( 0.082 \times \mbox{Number of unique unfamiliar words} \right) + 0.659

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