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  • Writer's pictureGeorge Duckstein

i-Ready Diagnostic Test Results Now Available

Updated: May 5, 2021

This publication features the new i-Ready Diagnostic national norms for Grades K–8. These norms are new for the 2020–2021 school year and are based on data from the 2018–2019 school year. As is common for national norms, it is expected that these norms will remain in use for a number of school years, although Curriculum Associates will continue to monitor the norms each year to determine when new norms are needed.

What are i-Ready Diagnostic norms? Norms within i- Ready provide a way for educators to compare how their students are performing relative to other students across the country.

Where are the national norms located in i-Ready? The i- Ready Diagnostic normative scores are labeled as “percentile ranks” in i-Ready and are located in various places on the i- Ready platform, such as the Diagnostic Results (Class) report and the Diagnostic Results (Student) report. Percentile ranks are also available in the Diagnostic Results export.

How do you interpret i-Ready Diagnostic national norms? Norms are percentiles, comparing each student’s performance with a set of nationally representative samples of students in the same grade level who took the Diagnostic at the same time of year. For example, a student whose fall Diagnostic norm is 90 scored better than 90% of a nationally representative group of students who took the Diagnostic in the fall. Normative scores, together with other types of scores such as i- Ready Diagnostic criterion-referenced scores (i.e., grade-level placements for reading and mathematics and for domains) help educators gain a more complete picture of student performance. Whereas i-Ready’s normative scores communicate how students perform compared to other students, criterion-referenced scores communicate what students know and can do against grade-level standards. National norms corresponding to overall scale scores are available for both the i- Ready Diagnostics for Reading and Mathematics.

How often are i-Ready Diagnostic norms updated?

Consistent with well-established practices in educational assessment, the i-Ready national norms are evaluated every year to determine if an update is needed. The newest norms are those for the 2020–2021 school year, which are based on student data from the 2018–2019 school year. The last update was in 2015–2016.

When will i-Ready Diagnostic norms be updated again? Curriculum Associates will evaluate the 2020–2021 norms in coming years to determine if new norms are needed and will update the norms when necessary to ensure i-Ready Diagnostic norms continue to reflect student performance across the nation. For more information: To learn more about i-Ready Diagnostic norms, please contact an i- Ready Educational Consultant or Account Manager, or email

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