Reading Grade Level

The Flesch-Kincaid Grade Level formula estimates the US school grade required to understand a text. The companion Reading Ease score (0–100) measures readability — higher scores mean easier reading

The calculator uses the standard published formula for grade level. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: FK Grade Level = 0.39 × (words/sentences) + 11.8 × (syllables/words) − 15.59. Each step in the calculation is shown so you can verify the result manually.