The 2026 Lexile® and Quantile® Norms: How the Norms Were Developed

Research Highlights

The 2026 Lexile and Quantile norms provide updated reference points for interpreting student reading and mathematics performance by grade and testing season.

• More recent data from across the country. The update draws on assessment data from 2021–2025 for approximately 19.9 million students in reading and 17.1 million in mathematics, spanning all 50 states and the District of Columbia.
• Weighting to account for geographic differences. Results were weighted by grade and U.S. Census region to better align with the geographic distribution of the U.S. student population.
• Comparisons across grades and seasons. Lexile and Quantile scales enabled researchers to combine interim and summative assessment results to develop fall, winter, and spring norms for grades K–12.

Background Summary

As student performance changes, the reference points used to interpret assessment results need to change, too. The 2026 update uses more recent data and a substantially larger sample to help put Lexile and Quantile measures in context.

This research brief explains how MetaMetrics developed the updated norms, including the sample, data processing, weighting, and statistical methods. It also outlines limitations and guidance for interpreting the results. The norms describe relative performance; they do not directly measure individual growth or determine whether students have met proficiency standards.

Read the full research brief.

What do the updated data reveal about student performance? Explore the observations, comparisons, and trends in our Lexile and Quantile Norms White Paper.