U.S. school grade placement is not determined by age alone. States and school districts may use different kindergarten cutoff dates, and individual students may start school later, repeat a grade or skip a grade. This calculator uses September 1 as a simple reference date, so it is useful for a quick estimate but should not replace school records.
If you know that you started kindergarten at age 6 instead of age 5, change the setting in the calculator to better match your history.